http://www.next.gr/templates/cleancss/img/feed-esyndicat.pnghttp://www.next.gr/http://www.next.gr/power-supplies/high-voltage/http://www.next.gr/power-supplies/high-voltage/High-voltage-supply-l12278.htmlA 6 V battery can provide 100-150 Vdc center-tapped at a high internal impedance (not dangerous though it can inflict an unpleasant jolt). A 6.3 V transformer is connected ' 'in reverse'' with a transistor used in a Hartley oscillator configuration. The frequency of operation may be controlled by varying the value of the 10 ohm resistor. Sun, 24 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/Room-Ioniser-circuit-l11752.htmlThis is a voltage multiplier circuit acting as an Ioniser. Its calculated to feed 220V from mains and the output is about 6KV. Caution should take with the circuit as can be dangerous due to mains. You can place a needle at the output 3cm long. Wed, 20 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/Cold-Cathode-Fluorescent-Lamp-Supply-l14309.html For back-lit LCD displays, this supply will drive a lamp. LT1072 drives Ql and Q2, and a sine wave app Mon, 18 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/Battery-powered-high-voltage-generator-l13614.htmlOutput voltage great enough to jump a l-inch gap can be obtained from a 12-V power source. A 555 timer IC is connected as an astable multivibrator that produces a narrow negative pulse at pin 3. The pulse turns Ql on for the duration of the time period. The collector of Ql is direct-coupled to tbe base of tbe power transistor Q2, turning it on during the same time period. Fri, 15 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/Simple-high-volt-supply-l12276.htmlA light dimmer, a 1 µf capacitor and a 12 V car ignition coil form the simple line powered HV generator. The current in the dimmer is shown in Fig. B. At times tp t2, set by the dimmer switch, the inner triac of the dimmer switches on, and a very high and very fast current pulse charges the capacitor through the primary of the induction coil. Then at a rate of 120 times per second for a 60 Hz line, a very high voltage pulse appears at the secondary of the coil. Tue, 05 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-regulator-l13618.htmlThe regulator delivers 100-V at 100 mA and withstands shorts to ground. Even at 100 V output, the LT317A functions in the normal mode, maintaining 1.2 V between its output and adjustment pin. Under these conditions, the 30-V zener is off and Ql conducts. When an output short occurs, the zener conducts, forcing Q1"s base to 30 V. This causes Q1"s emitter to clamp 2 VnEs below Vz. well within the V.w VouT rating of the regulator. Fri, 22 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/Power-Supply-Monitor-Memory-Protector-l14320.html This circuit detects low-voltage supply conditions, down to 0.6 V. Dl sets the trip point of the cir Thu, 21 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-dc-generator-l13613.htmlThis circuit is fed from a 12-V de power supply. The input to the circuit is then amplified to provide a 10,000-Vdc output. Mon, 11 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/Squib-firing-circuit-l12154.htmlCapacitor Cl is charged to +28 V through Rl and stores energy for firing the squib. A positive pulse of 1 mA applied to the gate of SCR1 will cause it to conduct, discharging Cl into the squib load XI. With the load in the cathode circuit, the cathode rises immediately to + 28 V as soon as the SCR is triggered on. DiodeD1 decouples the gate from the gate trigger source, allowing the gate to rise in potential along with the cathode so that the negative gate-to-cathode voltage rating is not exceeded. Mon, 04 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/Remotely-adjustable-solid-state-high-voltage-supply-l13620.htmlThe output voltage changes approximately linearly up to 20 KV as the input voltage is varied from 0 to 5 V. The oscillator is tuned by a 5-0 potentiometer to peak the output voltage at the frequency of maximum transformer response between 45 and 55 kHz. The feedback voltage is applied through a 100-KO resistor, an op amp, and a comparator to a high-voltage amplifier. A diode and varistors on the primary side of the transformer protect the output transistor. Thu, 17 Jan 2013 00:01:00 MSThttp://www.next.gr/power-supplies/high-voltage/HV-regulator-with-foldback-current-limiting-l12268.htmlA TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting. A 15-V zener, Dlf provides the dc reference for operational amplifier Ul, whose other input is obtained from a fraction of the output voltage. Ul drives Q3, which drives the gate of Q2. Tue, 11 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/Capacitor-discharge-high-voltage-generator-l13619.htmlStepdown transformer T1 drops the incoming line voltage to approximately 48 Vac which is rectified by diode D1; the resultant de charges capacitor C1-through current limiting resistor Rl-to a voltage level preset by R4. When the voltage on R4"s wiper reaches about 8.6 V, Q1 begins to turn on, drawing current through R7 and the base-emitter junction of Q2. Q2 turns on and supplies a positive voltage to the gate of silicon-controlled rectifier Q3. Tue, 11 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Dc-Generator-Circuit-l14901.html In the miniature high-voltage dc generator, the input to the circuit, taken from a 12-Vdc power supply, is magnified to provide a 10,000-Vdc output causing a pulsating signal, of opposite polarity, to be induced in Tl`s secondary winding. The pulsating dc output at the secondary winding of Tl (ranging from 800 to 1000 V) is applied to a 10-stage voltage-multiplier circuit, which consists of D1 through D10, and C3 through C12. The multiplier circuit increased the voltage 10 times, producing an output of up to 10,000 Vdc. The multiplier accomplishes its task by charging the capacitors (C3 tlirough C12); Tue, 11 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/Ultra-high-voltage-generator-l12275.htmlBy repetitively charging and discharging a capacitor through the primary of an induction coil with a high voltage, an ultra high emf is induced in the secondary. Switching is performed by the triac, triggered by the disc at times set by Cl and Rl. With a 12 V car ignition coil for example, the length of sparkgap obtained is 12 mm of air for C2 = 0.1 µ¥. If the dielectric strength of air is assumed to be 3 kV/mm, this spark-gap length corresponds to 36 kV. Sun, 09 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/10000Vdc-Supply-l14495.html A CMOS oscillator (U1A) drives. U1B through U1F, which drives Ql, which generates a 12-Vpp square wave across the primary Tue, 27 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/Preregulator-for-power-supply-l12271.htmlThis SCR pre-regulator keeps the filter capacitor Vc, in a variable output power supply, a few volts above the output voltage V0. The benefits include: less heat dissipated by the pass transistor and therefore small heatsink, cooler operation and higher efficiency, especially at low output voltages. Ql, Rl, R2, Dl and D2 form a constant current source for zener Zl, so that the contribution to the output current is always a few mA (2-3 mA). The Darlington pair Q2, Q3 keeps the SCR off. Wed, 21 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/Zener-diode-increase-regulator-output-l12272.htmlA zener diode in the ground lead of a fixed pnp regulator varies the voltage output of that device without a significant sacrifice in regulation. Wed, 21 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-inverter-l13617.htmlThe circuit converts a de voltage (V +) to a high-amplitude square wave in the audio-frequency range. The dual timer, IC2, provides an inexpensive alternative to the traditional transformer for providing complementary base drive to the power transistors, Ql and Q2. You can convert a 6 to 12 V battery output, for example, to an ac amplitude, which is limited primarily by the power rating of transformer Tl. Connect timer IC1 as an oscillator to provide a symmetrical square-wave drive to both inputs of IC2. The timing components, R2 and Cl, produce a 2.2-kHz output frequency. Sun, 04 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/Photomultiplier-Supply-Circuit-l14903.html A Cockcroft-Walton voltage multiplier supplies the stepped voltage required for the dynodes of the PMT without the power-wasting voltage- divider resistor Tue, 23 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-geiger-counter-supply-l12277.htmlThis circuit will generate about 300 volts dc—at a very low current, but enough for a GM tube. Fri, 19 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/Off-line-flyback-regulator-l12270.htmlThis circuit uses a low-cost feedback scheme in which the dc voltage developed from the primary-side control winding is sensed by the UC1842 error amplifier. Load regulation is therefore dependent on the jcoupling between secondary and control windings, and on transformer leakage inductance. Mon, 08 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/Memory-save-on-power-down-l12274.htmlThe auxiliary output powers the memory, while the main output powers the system and is connected to the memory store pin. When power goes down, the main output goes low, commanding the memory to store. Thu, 04 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/13KV-High-voltage-power-supply-l11839.htmlThis high-voltage power supply has an inverter around Q1 that supplies 150-V pulses to the converter of SCR1 and C2. The output of ?2 is a 4.5-kV pulse that is multiplied by the voltage-tripler network (right) to produce 13.5 kV. Tue, 25 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/Preregulated-high-voltage-supply-l13611.htmlOne of the control circuit"s triacs selects the tap on main transformer Tl, which provides the proper, preregulated voltage to the secondary regulator. T2 and its associated components comprise the secondary regulator. The ADC 0804, IC1, digitizes a voltage-feedback signal from the secondary regulator"s output. The MC1415 demultiplexer, IC2, decodes the digitizer"s output. IC2, in turn, drives Tl"s optoisolated triacs via the 74LS240 driver chip, IC3, and associated optoisolators. Thu, 20 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-bucking-regulator-l13612.htmlThis circuit is basically tbe classic bucking regulator, except it uses a TMOS N-channel power FET for the chopper and creates its own supply for the gate control. Tht unique aspect of this circuit is how it generates a separate supply for the gate circuit, which must be greater than Vvv. When power is applied, C2 charges, through D2, to +12 V. At this time, Q1 is off and the voltage at point A is just below zero. Fri, 14 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Supply-Circuit-l14907.html This circuit uses a transistor oscillator and a voltage multiplier to charge CIO and CI 1 to a high voltage. When the spark gap breaks down, T2 produces a high-voltage pulse via the capacitance discharge of CIO and Cll into its primary. Mon, 10 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/40W-120Vac-Inverter-l14308.html This inverter uses a 12.6-V to 120-V transformer to deliver a quasi-sine wave that has the same rms and peak voltage Sun, 02 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/Photomultiplier-Circuit-Circuit-l14905.html This circuit is typical of the way that a photomultiplier tube is used. The circuit shown is ac coupled, but if dc coupling is needed, the capacitor can be omitted and a suitable interfacing method used. Thu, 23 Aug 2012 00:08:00 MSThttp://www.next.gr/power-supplies/high-voltage/Voltage-Multiplier-l14494.html Figure 99-l(a)"s circuit exhibits a high-output impedance as a result of the small effective capacitance of the series-c Mon, 13 Aug 2012 00:08:00 MSThttp://www.next.gr/power-supplies/high-voltage/90Vrms-voltage-regulator-l12269.htmlThe circuit is an open loop rms voltage regulator that will provide 500 watts of power at 90 V rms with good regulation for an input voltage range of 110-130 V rms. With the input voltage applied, capacitor Cl charges until the firing point of Q3 is reached causing it to fire. This turns Q5 on which allows current to flow through the load. As the input voltage increases, the voltage across R10 increases which increases the firing point of Q3. This delays the firing of Q3 because Cl now has to charge to a higher voltage before the peak-point voltage is reached. Fri, 27 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Power-Supply-10kV-l11757.htmlBe very carefull with this power supply because uses 220V mains and has 10KV at output. Thu, 26 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/Hv-Power-Supply-With-9-To-15Vdc-Input-Circuit-l14916.html The combination Hartley oscillator/step-up transformer shown in A can generate significant negative high voltage, especially if the voltage output of the transformer Sun, 22 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/Arc-jet-power-supply-and-starting-circuit-l13610.htmlThis .circuit for starting arc jets and controlling them in steady operation is capable of high power efficiency and can be constructed in a lightweight form. The design comprises a pulse-width-modulated power converter, which is configured in a closed control loop for fast current control. The series averaging inductor maintains nearly constant current during rapid voltage changes, and thereby allows time for the fastresponse regulator to adjust its pulse width to accommodate load-voltage changes. Fri, 20 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/Increasing-the-power-rating-of-zener-diodes-l12273.htmlA power transistor can be used to provide a high powered zener voltage from a low wattage zener. A 400 mW zener can be used where a 10 watt zener is required or a 1 W zener can be used where a 50 to 80 watt zener is required by using appropriate transistors for Ql and Q2 in the circuits shown. Where low rating is required, Ql would be an ASZ 15 (germanium) or an AY9140 (silicon). Q2 could be a 2N2955 (silicon). For higher powers, Ql should be an ASZ18 (germanium) or a 2N2955 (silicon) and Q2 a 2N3055 (silicon) or an AY8149 (silicon). Sun, 15 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/Negative-Voltage-Supply-Circuit-l14904.html The combination Hartley oscillator/step-up transformer shown in A can generate significant negative high voltage, Tue, 19 Jun 2012 00:06:00 MSThttp://www.next.gr/power-supplies/high-voltage/Voltage-Doublers-l14496.html During the first half-cycle (Fig. 99-5(a)), Dl conducts, D2 cuts off, CI changes to 170 V peak, and C2 discharges through Wed, 06 Jun 2012 00:06:00 MSThttp://www.next.gr/power-supplies/high-voltage/Optoisolated-high-voltage-driver-l13615.htmlThis circuit takes as an input a signal from a 5-V CMOS logic circuit and outputs a high voltage of the same polarity. The high-voltage supply can be varied from ±30 V to ±150 V without the need to change circuit components. The input voltage is applied to the gates of transistors TRl and TR2. TR3 is optically coupled to D1 as is TR5 to D2. R5limits the current through D2, while R3 and R4 reduce the affects of leakage current. Tue, 05 Jun 2012 00:06:00 MSThttp://www.next.gr/power-supplies/high-voltage/2000V-Low-Current-Power-Supply-l14498.html In this circuit Ql, Q2, Rl, and CI form a multivibrator. The square wave that results from the oscillation Fri, 25 May 2012 00:05:00 MSThttp://www.next.gr/power-supplies/high-voltage/Squib-firing-circuit-2-l12155.htmlThe LRC input network limits the anode dv/dt to a safe value—below 30 V/jus. Rl provides critical damping to prevent voltage overshoot. While a simple RC filter section could be used, the high current required by the squib would dictate a small value of resistance and a much larger capacitor. Resistor R3 provides dc bias stabilization, while C3 provides stiff gate bias during the transient interval when anode voltage is applied. The SCR is fired one second after arming by means of the simple R2C2Z1 time delay network. Wed, 02 May 2012 00:05:00 MSThttp://www.next.gr/power-supplies/high-voltage/Get-Negative-Rail-With-Cmos-Gates-l14307.html Using a charge pump and oscillator, this circuit uses a 7-kHz oscillator. When the clock is high, C and D Thu, 19 Apr 2012 00:04:00 MSThttp://www.next.gr/power-supplies/high-voltage/Simple-high-voltage-supply-l13616.htmlThis circuit can generate high-voltage pulses with an inexpensive auto ignition coil. Add a rectifier on the output and the circuit produces high-voltage de. The circuit"s input is 115 Vac. During the input"s positive half cycle, energy is stored in capacitor Cl, which is charged via diode Dl and the primary winding of transformer T1, the coil. The SCR and its trigger circuitry are inactive during this period. Tue, 10 Apr 2012 00:04:00 MSThttp://www.next.gr/power-supplies/high-voltage/The-25-30kV-DC-Generator-l4304.htmlThis High Voltage power supply is able to generate up to 25-30kV DC Output from a 12-24v DC input. With a fully adjustable DC input power supply (0-24V/4A), it is possible to adjust the HV output between 5 to 30kV. This HV power supply use a common flyback driver circuit with two 2N3055 power transistors as a push-pull oscillator. A common flyback transformer from an old TV/monitor can be used, the transformer HV output is connected to a 30kv Voltage tripler which commonly used in all color TV monitors. Sat, 30 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/5000-Volts-arc-supply-l7668.htmlA Very Low Current, High Voltage Spark, that is "Manually Triggered". Although its not easily Measured, the Peak Ouput voltage will be over 5,000 Volts. T1 is a small audio transformer and it steps up the voltage to about 500 Volts at Point "X" on the schematic. The main power limitation to this device is T2. It can be a Standard Trigger Coil, like those used on Strobe Kits, or a Custom made Trigger Coil. For A Custom coil, You can wind one Simular to those in my Stun Gun Write-ups. Which-Ever Coil you use for T2, If you try for Too long of an Arc, It will Arc Internally, Permanently Shorting itself Out. So Start with a Small Arc and Slowly Increase it to try and find the Maximum Distance. Than Reduce it Slightly to give a small Safety Margin. Sat, 16 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/1-kV-power-supply-l4301.htmlDesigning a high-voltage switching power supply that can produce a sustained arc can be challenging. This compact and efficient design delivers 1 kV at 20W and can withstand a continuous arcing, or short-circuit, condition (Figure 1). It uses standard, commercially available components. R1 sets the LTC1871 switching-regulator controller for a nominal operating frequency of 120 kHz. Sat, 02 Mar 2013 00:03:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-amplifier-drives-piezo-tubes-l4263.htmlThe circuit in Figure 1 can drive high-resistance, low-capacitance piezoelectric loads at a 3-dB bandwidth of 6 kHz. It offers a low-cost alternative to commercial drivers. Sun, 17 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/Capacitor-Discharge-Ignition-l8200.htmlThe CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and MOSFET (IRF510) are used to drive the low voltage side of a small (120/12 volt) power transformer and a voltage doubler arrangement is used on the high voltage side to increase the capacitor voltage to about 340 volts. Sun, 17 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/StunGun-circuit-l4276.htmlThe Electronic Dazer is a modern, portable, personal-protection appliance. It generates hight potential energy to ward off vicious animals or other attackers. It is an aid to help exape from a potentially dangerous situation. the device develops about 2,000 volts. Higher voltages mabe be attained by adding aditional multiplier stages, but it should be noted that those stage will also increase the overal size of the unit. Fri, 15 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Power-Supply-l4292.htmlThe TPS61040 is a highly integrated, low power, boost converter capable of delivering output voltages up to 28 V. However, using a coupled inductor enables the TPS61040 to be used in applications where higher voltages are required. Output voltages up to 75 V are achieved using this technique. Mon, 11 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/Adjustable-High-Voltage-PS-l4275.htmlThe regulator has no ground pin; instead, all the quiescent current (about 5 mA) flows to the output terminal. Since the regulator sees only the input-output differential, its voltage rating ½  40V for the standard LM117 series and 60V for the high voltage LM117HV series ½  will not be exceeded for outputs of hundreds of volts. Sun, 10 Feb 2013 00:02:00 MSThttp://www.next.gr/power-supplies/high-voltage/Xenon-DC-DC-Converters-l4277.htmlThis DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don`t need to build or wind any coils or transformers. This is a cheap-and-dirty experimenter`s circuit. I tested this and it worked for me, but I disclaim all warranties! Sat, 19 Jan 2013 00:01:00 MSThttp://www.next.gr/power-supplies/high-voltage/Electric-Fence-circuit-l7678.htmlA circuit design, based on a C-mos chip to Drive a Car Ignition Coil. This is a Very Simple and Efficient Design for an Electric Fence. It puts out a Very high Voltage Current pulse, yet it draws a very small average Current from the battery or supply. As Accurate as I can Measure, the "AVERAGE Current Draw" varies between: 20 uA at at Slow Pulse setting to about 85 uA at the fast pulse setting. So Battery life is "Really Good" and this makes a Good Electric Fence. Due to a High Peak Current Draw, this Fencer will NOT work properly, just running from a Power Adapter or a work-bench power supply. This Electric Fence Should be powered by a 12 Volt Battery and this battery. Should have a Trickle Charger on it. Fri, 18 Jan 2013 00:01:00 MSThttp://www.next.gr/power-supplies/high-voltage/high-voltage-swing-from-lower-supplies-l4297.htmlThe circuit in Figure 1 uses a fully differential amplifier to offer an answer to this problem. Fully differential amplifiers enable you to deliver an output-voltage swing beyond the rails into the load. One of the common problems in working with operational amplifiers is the limit that the power-supply rails impose. Mon, 07 Jan 2013 00:01:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Switching-for-Energy-Recovery-l4303.htmlThis is a High Voltage switching device for driving coils and which have big impedance when it is switched off. It can be use in Back-EMF energy recovery tests, Newman coils electronic commutator.....This device is drived by an opto-coupler and can be easily connected with an opto-switch for synchronisation phase (with plastic shutters) with a Newman commutator device for instance..... Mon, 31 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Power-Supply-l4264.htmlThe circuit is built around a single transistorised blocking oscillator. An important element in this circuit is the transformer. It can be fabricated on easily available ferrite cores. Two E sections of the core are joined face-to-face after the enamelled copper wire wound on former is placed in it. The details of the transformer windings are given in the Table. Fri, 28 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-power-Supply-l7895.html A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by electric charging of fences. Here the current requirement is of the order of a few microamps. In such an application, high voltage would essentially exist between a live wire and ground. When this live wire is touched, the discharge occurs via body resistance and it gives a non-lethal but deterrent shock to an intruder. The circuit is built around a single transistorised blocking oscillator. An important element in this circuit is the transformer. It can be fabricated on easily available ferrite cores. Two E sections of the core are joined face-to-face after the enamelled copper wire wound on former is placed in it. The details of the transformer windings are given in the Table. Tue, 25 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/Flyback-Transformer-circuit-with-555-l8103.htmlThe 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a 2N3904 and a 2N3906, which are cheap, and easy to find. The totem pole ensures the gate being charged and discharged very fast (approx 50nS i think). The IRF840 is a cheap (i found it for 4euros) reliable and powerful power mosfet, it has current capability of 8 A continuous and 32A pulse, 800V drain source voltage, protecting internal zener diode. Fri, 14 Dec 2012 00:12:00 MSThttp://www.next.gr/power-supplies/high-voltage/HV-LASER-Power-Supply-l4299.htmlIf you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves. This supply can be built with commmon parts, most of which you probably already have in your junk box. The secret is the transformer used. It is a common 9V 1A unit, connected backwards for step up. Sun, 11 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Accuracy-High-Voltage-Monitor-l4285.htmlThe integrator (OP177) supplies negative feedback around the difference amplifier (AD629), forcing its output to stay at 0 V. The voltage divider on the inverting input sets the common-mode voltage of the difference amplifier to VIN/20. VOUT, the integrator output and the measurement output, sources the required current to maintain the common-mode voltage. R1 and C1 compensate the system to a bandwidth of 300 kHz. Wed, 07 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/HV-Ignition-Coil-Driver-using-555-l7670.htmlA Simple design based on a 555 to Drive a Car Ignition Coil. I Designed this for a Small Electric Fence to Protect my Vegitable Garden from some Small Animal called a Marmots. Last year they ate one of my crops entirely before I could install this device. A Few Shocks and No More Probem. My Garden is on Raised beds and the High Voltage wire is just 3 inches above the wood frames on homemade PVC Pipe Insulators. Could be Quite useful for persons that have Rabbit Problems also, with the wire raised a bit higher, But Read Warning Below. Definately Makes a STRONG Electric Fence. However, because it is a Continuous pulse output, Wed, 07 Nov 2012 00:11:00 MSThttp://www.next.gr/power-supplies/high-voltage/Tesla-Coil-schematic-l8091.htmlSimilar to the two transistor solid state Tesla Coil already on this site, this solid state Tesla Coil design uses a normal flyback transformer to generate it's high voltage output. Unlike the other circuit, this one does not use two huge power transistors and high wattage resistors. Instead it uses a 555 timer to more efficiently drive a single MOSFET. It's waveform has adjustable off and on time, making for an efficient circuit with little waste heat. It can be adjusted to drive most commonly found flyback transformers and can operate from a 12V to 18V supply. HV output can reach 60KV or more depending on the transformer and supply voltage. Sun, 28 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-High-Current-Power-Supply-l4262.html# The circuit can produce about 250-500mA at 2KV, depending on the transformer. # For C1, you can use the capacitor out of an old microwave. # This circuit is mainly provided as a demonstration of using commonly available parts for something uncommon. This circuit is dangerous! Do not build it if you do not have any experience with electronics or high voltage. Sun, 21 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/Flyback-Driver-l4294.htmlThe heart of the circuit is a ferrite-cored flyback transformer. There are several different types of flybacks, and any device using a cathode ray tube will contain one (this includes oscilloscopes, televisions, monitors, and others). Most computer monitors and newer televisions use flybacks which have the high voltage rectifier built in. Although a HV rectifier is useful if you want to charge up capacitors or experiment with ion streams, having the rectifier built in is not desired for most high voltage experiments, as it will make the output half wave, and in that way make the output voltage 55% lower than it would be without it. Sun, 21 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/Air-Ioniser-circuit-l7281.htmlA basic mains driven Cockroft ladder high voltage generator is shown in the schematic. This is functionally the same as a project in Electronics Today International many years ago. The peak mains voltage of 340V appears across each capacitor and this is negative with respect to mains neutral and the surrounding environment. The orientation of the diodes defines the polarity. As the capacitors are in series, the voltages sum and at the top of the ladder about 7kV is present. A high value resistor is used at the output end to current limit the output. It is important to use a high voltage rated resistor or a string of lower voltage ones in series, so that the resistors maintain their stated resistance value. This design is for 220 to 240V mains power and a double length ladder would be needed for 110V supply. Sun, 21 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-from-an-Ignition-Coil-l4287.htmlThe peak output voltage will be approximately 15,000 to 20,000 volts, but this will vary with the ignition coil type and the voltage at which the MOV starts conducting. Do not touch any part of the 555 circuit including any leads of the timing resistors or timing capacitor; doing so can inject interference into the circuit. Tue, 16 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/HV-Buck-Converter-l4284.htmlWhen the DC input voltage to a buck converter has a wide range, it becomes important to not only select a suitable switching regulator IC for the application, but to select the power components to handle the worst-case input voltage. Sat, 06 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/NITROGEN-SPARK-GENERATOR-l4279.htmlNitrogen or air sparks are very powerful light sources that produce flashes that last only a few nanoseconds. This line-powered circuit generates a continuous series of very small sparks across electrodes with a 0.05-inch gap. Tue, 02 Oct 2012 00:10:00 MSThttp://www.next.gr/power-supplies/high-voltage/Stun-Gun-with-555-l7607.htmlThis stun gun is powered by a 9V battery. The transformer steps up the voltage to about 1800V (but with very low current). A 555 timer IC is used to generate a high-frequency output. A 1 MEG variable resistor can also be used at the output to drop the voltage, but this is optional. If you build this circuit, be careful, as it outputs a high voltage. Touching the output leads will induce a painful shock. Fri, 28 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/Mosfet-stabilized-power-supply-l4295.htmlOne very important Part of a Tube Amplifier is the Power Supply. It is crucial for the quality of the whole system. Especially beginners encounter problems like Hum or Drift that can become quite annoying. But resue is ahead: The following circuit uses a modern Mosfet to deliver a stable and virtually Hum-free voltage to power a large number of Tube (and others of course) Projects. I use this PSU for an OTL Headphone-Amplifier and two EL84 Power Amps. Wed, 26 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/12KV-output-HV-supply-l4286.htmlObtain flyback transformer with known good HV secondary winding. primary may be left intact if it is known to be in good condition - non shorted. A flyback removed due to failure may be used if it was the primary that failed and the primary turns can be removed without damaging the HV secondary or losing the secondary return connection! Flybacks fail in both ways (primary and secondary). Wed, 19 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/flyback-with-a-pulsed-DC-signal-l5682.htmlA 555 is used as an oscillator, optimally around 15.76KHz (in North America). Power pins on the chip (pin 1 to ground, pin 8 to +12V) are not shown on the diagram. The output from the 555 is then switched by PNP transistor Q1 and by the large 2N3055 NPN power transistor. Q2 must be adequately heatsinked as well since it may well switch over an amp during operation. Output terminals are then connected to a primary winding of the flyback. The average flyback has up to ten primary terminals and one secondary (the secondary identified as the thick, insulated, wire protruding from the top of the unit). Thu, 13 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/12-to-120-Volt-Inverter-l4293.htmlIt will supply 15 watts of AC power to a device. It should power lamps, shavers, small stereos and small appliances. If you draw to much power the circuit will shut down all by itself. The output of this circuit is a square wave so there may be some noticeable hum on audio units plugged into it. Wed, 05 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/Car-Ignition-Coil-Driver-gives-15kV-l7667.htmlThis Spark Can Be Very DANGEROUS, So BE CAREFUL. WARNING: FAILURE TO DO SO: WILL CAUSE THE CASE OF THE COIL TO ALSO BE ELECTRIFIED! NOTE You MUST have a LOAD on the High Voltage Output. With NO LOAD, you have a High Risk to "Damage the Ignition Coil". Either a Spark Gap or a High Resistive Load is suitable. A 220 or 240 VAC @ 50 Hz Version is Definately Possible. Sorry but I don't have that AC power source to test one out. Lastly, If you Build this circuit, Its at your own Risk. I Will Not accept responsibility for what you do! Wed, 05 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/Tesla-Coil-using-555-l8033.html Single transistor flyback driver caused many problems due to it's operating principle. I received e-mails from people who were unable to get it functional even when they are sure that their flyback and transistor is OK. In addition, since it's resonance frequency is determined by every part of the system, when you try to draw an arc from the transformer, it changes dramatically in most of the cases. Just because the operating frequency is important for the safety criteria, (both for mine and power transistor's), I decided to make it run on a constant frequency and built up another simple circuit, trying to stay in the specified limits of the 555 timer. Sun, 02 Sep 2012 00:09:00 MSThttp://www.next.gr/power-supplies/high-voltage/Capacitor-discharge-ignition-system-PIC-16F615-l7416.htmlThis device uses a PIC12F615 to implement a capacitor discharge ignition system. When the switch (button) is closed, the PIC sends pulses to the IRF644 MosFet creating high voltage pulses to charge the 1.0 uf/250 volt capacitor. The voltage is read back via a 1M/10k divider until 200 volts is reached. Then the SCR (mislabeled triac above) is fired and 200 volts applied to the primary of the ignition coil. Note, the 12 volt zener is needed to let the capacitor discharge to zero and allow the SCR to reset. Wed, 29 Aug 2012 00:08:00 MSThttp://www.next.gr/power-supplies/high-voltage/12-000-Volt-PS-l4278.htmlIf you need about 12,000 volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line. Although the circuit can only deliver about 5uA of current it can produce dangerous shocks, so be careful. Sun, 19 Aug 2012 00:08:00 MSThttp://www.next.gr/power-supplies/high-voltage/Current-sense-amplifier-handles-high-voltages-l4298.htmlThe external circuitry in Figure 1 allows IC1 to monitor current at voltages of 300V and greater. Q1 and Q2 form a current source whose compliance voltage provides the high-voltage capability. IC1 draws its 100-µA supply current from a simple floating power supply comprising C1, C2, avalanche diode D1, and the Q1-Q2 current source. Sun, 19 Aug 2012 00:08:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Ring-Generator-l4280.htmlThe Supertex HV440 is used for implementing a pulse width modulated high voltage ring generator for telecommunication applications. The HV440 can operate in both closed-loop or open-loop. A closed-loop design is more complex but provides better load regulation and lower THD compared to an open-loop design. Mon, 13 Aug 2012 00:08:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-Voltage-Low-Current-Power-Supply-l4282.htmlIn this configuration, the primary winding and the feedback winding are arranged such that a sustaining oscillation is ensured once the supply is switched on. The waveforms duty cycle is asymmetrical, but it is not very important in this application. Please note that if the oscillations do not occur at the switch-on time, the transformer winding terminals of the feedback or the primary winding (but not both) should be reversed. Sat, 28 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/20kV-Flyback-power-supply-l6922.htmlThe 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a 2N3904 and a 2N3906, which are cheap, and easy to find. The totem pole ensures the gate being charged and discharged very fast (approx 50nS i think). The IRF840 is a cheap (i found it for 4euros) reliable and powerful power mosfet, it has current capability of 8 A continuous and 32A pulse, 800V drain source voltage, protecting internal zener diode. There is a snubbing network to ensure that voltage spikes are kept low (unless the insulation of the transformer start to leak) protecting both transistors and 555 IC. 100 ohm is a compromise between decay time and voltage spike. Sun, 22 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-amplifier-l4290.htmlThis Design Idea presents a simplified ac high-voltage amplifier that uses complementary, cascaded NMOS and PMOS transistors (Figure 1). The OP07 op amp has low input-offset voltage, low input-bias current, and high open-loop gain. Thu, 19 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/Jacob-s-Ladder-l4269.htmlYou will need 12K-15K volts AC (50/60) Hz at say 20-30 mA. A neon sign (luminous tube) transformer is the usual source though an oil burner ignition transformer will work in a pinch (some say better and cheaper) or you could build an inverter type power supply. Sun, 15 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/30KV-Power-supply-Generator-l7805.htmlEasy to build, this high voltage generator is capable of generating up to 50KV but the breakdown voltage of the coil limits the voltage to a value somewhat lower. T2 is the ignition coil of a car and also the 0.5µF capacitor comes from the same place: actually I suggest using only this type of capacitor. T1 is a small transformer with a laminated iron rod, with a square section of 7x7mm, 57mm long with 75 turns on the collector side and 25 turns on the base side made with a 1mm enamelled wire. Its implementation is not critical and I expect that the circuit will work with a wide variety of transformers including ferrite ones. Thu, 12 Jul 2012 00:07:00 MSThttp://www.next.gr/power-supplies/high-voltage/Pulse-Voltage-Multiplier-l7024.html It still uses a transistor to do some switching, and it still needs a pair of diodes and capacitors, as would be used in a conventional multiplier, but it doesn't require a steady stream of pulses and the output voltage is set by a resistor divider as the 100k and 150k resistors make 2 volts that are added to the 10 volt pulse on the transistors' collector. What it doesn't need is a steady stream of pulses to keep the output voltage pumped up all the time. The basic multiplier cell was inspired by a discussion I had with a well know laser scientist, Mr. Christoph Krah, about laser triggering circuits. After I finished this circuit, I sent it to Mr. Krah to get his opinion of how this circuit related to some of those we discussed years ago. Thu, 28 Jun 2012 00:06:00 MSThttp://www.next.gr/power-supplies/high-voltage/Helium-Neon-Laser-Power-Supply-l7825.htmlThe first 5 circuits described in the following sections were reverse engineered from commercial HeNe power supplies. There may be errors in transcription as well as interpretation. In many cases, the transformer secondary voltage was not marked and where the actual hardware was not available for testing, an estimate of its value was made. Many of these designs are quite old since modern commercial units tend toward inverter designs since they can be more compact and have higher efficiency. Unfortunately, these are nearly always potted in Epoxy and impossible to analyze. Sat, 09 Jun 2012 00:06:00 MSThttp://www.next.gr/power-supplies/high-voltage/High-voltage-regulator-l4274.htmlThe circuit in Figure 1 generates 100V from 25V. The circuit is a typical flyback regulator that uses a couple of well-established circuit techniques to handle the high voltage. Thu, 24 May 2012 00:05:00 MSThttp://www.next.gr/power-supplies/high-voltage/high-voltage-interface-l4268.htmlThe circuit uses fast transimpedance amps, "floated" at 70V. Two "virtual-zener" circuits step down the high-voltage signals for subsequent processing in a ground-referred differential-amplifier stage (Figure 1). The circuit drops exactly 65.58V dc with the component values shown, notwithstanding errors arising from op-amp offset voltages and resistor tolerances. Sun, 06 May 2012 00:05:00 MSThttp://www.next.gr/power-supplies/high-voltage/12V-DC-to-85V-DC-Converter-l8217.htmlThe circuit below is a DC to DC converter using a standard 12 VAC center tapped power transformer wired as a blocking oscillator. The circuit is not very efficient but will produce a high voltage usable for low power applications. The input battery voltage is raised by a factor of 10 across the transformer and further raised by a voltage tripler consisting of three capacitors and diodes connected to the high voltage side of the transformer. Fri, 04 May 2012 00:05:00 MSThttp://www.next.gr/power-supplies/high-voltage/Tesla-Coil-High-Voltage-Generator-l4267.htmlThis is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although I have never tried), demonstrate St.Elmo`s fire, and even cause a fluorescent bulb to light from as much as 2 feet away. Wed, 25 Apr 2012 00:04:00 MST