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Many circuits can be powered directly from the mains with the aid of a series capacitor (C1). The disadvantage of this approach is that usually only one half cycle of the mains wave-form can be used to produce a DC voltage. An obvious solution is to use a....
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This circuit can charge automatically, fast and rightly, batteries 6V and 12V. A basic factor in the success in the circuit operation is the use of transformer [T1] of good quality with very good insulation and resistance in the short circuits....
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The power supply has been simplified. Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator circuits: 1N5242 zener diodes between the source and gate and 10k resistors in series with the gate.....
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This unit employs a dual trace oscilloscope with X-Y function as a display to test and demonstrate the action of circuits and components such as transistors, diodes, zener diodes, and terminated and unterminated transformers. A low frequency sinewave (ie....
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This simple home emergency lights uses very few components yet is able to produce a reasonable amount of light. The components used are very common and can be easily procured from the local electronic retailer. This oscillations forces an AC in the secondary....
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The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these. To use the circuit, hook it up to a power supply/plug it in. Then,....
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This bulletin outlines applications, design features, equipment arrangement, and space planning, for the type 230 controllers. These controllers are for the control and protection of induction motors or transformers on 2300-4160-volt systems. Each type 230....
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If you wish to use a double power supply but don`t have a center trapped transformer you can use an electronic circuit in the following configuration. This electronic circuit uses a second rectifier bridge coupled with secondary coil of the transformer using....
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Its a simple fly back tester, I believe you can built it, i use this circuit to test all of high freq transformer like SMPS transformer or fly back, this circuit is an astable multivibrator with about 90Khz freq, 12 vdc as vcc. To check SMPS transformer or....
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This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have....
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I`ve been looking around for a mains (220-240VAC) power monitoring circuit that I might be able to interface with an Arduino. There is of course the OpenEnergyMonitor solution, but they seem to use a transformer to isolate and measure the mains voltage. The....
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This 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....
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The circuit consists of little more than a few coils, a step-up power transformer, and a capacitor. Power from an AC wall receptacle is fed to transformer T1 (a small neon-sign transformer) which steps the voltage up to about 3000-volts AC. The stepped-up....
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JFET Pierce oscillator will test any crystal from 50 kHz through 25-MHz upper frequency limit of fundamental-mode crystals without tuning, and drive counter for measuring crystal frequency, Will test overtone VHF crystals on their fundamental frequency. T1....
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No, wait.. the 15 KHz is the frequency that you use for drive the flyback transformer, is right, but the high voltage at the output is DC, cause....
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This converter has a central component, the CMOS 4047, and converts a 12V DC voltage to 220V AC voltage. 4047 is utilised as a astable multivibrator. At pin 10 and 11 we find a rectangular symmetrically signal which is amplified by tow Darlington transistors....
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The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these. To use the circuit, hook it up to a power supply/plug it in. Then,....
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The circuit is great for controlling the power delivered to a device such as a fan, LED`s or even transformers and coils. By adjusting the pulse width you can easily control the speed of a fan without sacrificing torque. This particular transistor, the....
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A static device that couples two circuits for the purpose of transferring alternating current (AC) from one circuit to another by electromagnetic induction. The current remains at the same frequency, but may change in voltage, phase, or impedance values. A....
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Your HVsupply will work, but for your own safety and to avoid accidental damage to your circuit if the event you need to troubleshoot with a scope, I strongly encourage the use of an isolation transformer on the 120VAC input. Just a little 1:1 transformer,....
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As transformer a toroidal transformer (2x12V 15VA) is used, because this gives much less energy losses then an E-I core transformer as used in the original mains adaptor (for more info, click here )...
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The buck converter circuit is the basis for several other similar circuits called forward converters. The buck converter circuit and the input and output voltages for this circuit are shown in Fig. 1. This circuit would be connected directly after the power....
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actually i wanted to know about the female connector used in PC for connecting the speaker. i hope u got it. i wanted to know the pin connections of the jacks. i shall show u the circuit for the audio coupling of the PC to telephone line. also please suggest....
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The circuit comprises two sections: charger power supply and LED driver. The charger power supply section is built around 3-terminal adjustable regulator (IC1) LM317, while the LED driver section is built around transistor BD140(T2). In the charger power....
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An old nonfunctional DVD player donated by the Engineering Department was gutted to provide an appropriate enclosure for the audio amplifier. To mount the nearly 16 lb toroidal transformer and 2in diameter filter capacitors, various sheet metal braces were....
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Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load current of the supply transformer/rectifier section was 4.4A. It tapers off to 4A at 13.5V, 3A at 14.0V,....
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Some circuits need a negative supply voltage that only has to supply a small current. Providing a separate transformer winding for this (possibly even with a rectifier and filter capacitor) would be a rather extravagant solution. It can also be done using a....
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This circuit idea is certainly not new, but when it comes to making a trade-of between using a small, short-circuit proof transformer or a capacitive voltage divider (directly from 230 V mains voltage) as the power supply for a fan, it can come in very....
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Instead of the 555 timer IC we have two transistors back to back acting as a multivibrator. This "chops" the direct current enough so it can travel across the magnetic field of the transformer. This is probably the simplest and easiest stun gun to make. It....
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Most Tesla coils designed for educational and experimental purposes use line-operated, step-up transformer-in setups like that shown in Fig. 1 -to generate the high voltage needed for the coil`s primary circuit. While there`s nothing technically wrong with....
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aquarium design, dpdt relay, 12v inverter: ONE: The relay you have selected is rated plenty sufficient for a 400 watt load. TWO: The 12v dc relay, transformer and diodes are using very little power so efficiency is of little concern. THREE: How are you....
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This wide-range light dimmer circuit uses a unijunction transistor and a pulse transformer to provide phase control for the TRIAC. The circuit operates from a 115 volt, 60 Hz source and can control up to 800 watts of power to incandescent tights. The power....