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Power Supply Circuits
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Switching Power Supply Circuits
12 Volt, 10 Amp Switching Power Supply
The switching power supply, shown in the schematic, provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. The supply was constructed in 1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today.
Reduce EMI in Switching PS
Power supplies that operate at a fixed frequency have their largest EMI emission at this fundamental, fixed frequency. Emissions also occur at multiples of the switching frequency but at diminished amplitudes. The simple circuit in Figure 1 makes the switching converter operate over multiple frequencies rather than one, thereby reducing the time...
LT3439l low noise switching architecture
Figure 1 shows the LT®3439, one of several low noise switchers available from Linear Technology. Ultralow noise and low EMI are achieved by controlling both the output switch voltage and current slew rates. This switching architecture is particularly well suited to noise-sensitive systems such as industrial sensing and control, data...
Linear supply uses switch-mode regulation
In Figure 1 , a basic and versatile 5V supply uses a zener diode and an emitter-follower transistor. You must calculate and design the transformer such that Q1 is close to saturation at low mains voltages and nominal output current. Additionally, you must choose R1 to ensure proper bias for the zener diode.
Soft-Start Controller for Switching Power Supplies
Start-up is a stressful time for the power driver section of a switching power supply. Because the output voltage is initially zero, the feedback error initially jumps to its maximum. The large feedback error then drives the loop filter to its limit, which drives the power switching transistors in the driver section of the power supply at...
555 timer as a switch-mode power supply
Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation. The design uses two 555s. IC1, in astable mode, triggers...
Single IC, 5 Output Switching Power Supply
This Design Note describes how to generate five separate output voltages using the LTC®1538-AUX, a dual synchronous switching regulator controller with internal circuitry adaptable to many additional configurations.
Switching regulator forms constant-current source
Many applications require current sources rather than voltage sources. When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor. To solve the wasted-power problem, you can use a switch-mode regulator. The circuit of Figure 1 uses IC1, an LM2576 adjustable...
Self switching Power Supply
One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable. This is achieved by connecting a potentiometer between common terminal of regulator IC and ground. For every 100-ohm increment in the in-circuit value of the...
Voltage Comparator Circuits
This page provides basic information about voltage comparator integrated circuits and is to act as reference material for other circuits. The circuits shown are based on the LM339 Quad Voltage Comparator chip or the LM393 Dual Voltage Comparator chip. These devices are functionally identical. The LM311 Voltage Comparator can be used for these...
Advanced Power Switcher
If you`re an effects builder or repairer, you know by now that it`s a good idea to protect the circuitry in the effect from the consequences of a reversed battery. While many older effects can withstand a momentary reversal, some more modern components can be damaged if you accidentally touch the battery contacts the wrong way during...
Pulsed Charger for Lead Acid batteries (NE555)
The object is to get the cell voltage high enough for the sulphate to dissolve without boiling or melting the battery. This is achieved by applying higher voltage for shorter periods and let the battery rest for a while. The pulses on short range is about 0.5s on / 3s off and the long pulse range is 1.4s on / 2s off. These times can vary...
12V 40A Switching Power Supply
The present trend is to use ever higher frequencies. But by doing so it becomes more difficult to filter out the RF noise inevitably generated by the switching. So I decided to stay at a low switching frequency of only 25 kHz for the full cycle, which due to the frequency doubling effect of the rectifiers results in 50 kHz on the output filter....
12V 10Amp MJ2955 Switching Power Supply
The switching power supply provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. With reference to the schematic, the front panel power-on light is not shown. There is no adjustable current limiter in this unit, although R1, R2, R3, Q2, R8, R9, C5 and Q4 se
L4970A Easy 5V 10A Switching Regulator circuit
Friends that seek 5V 10A power supply circuit small-sized and build easy. I begs for to advise this circuit. It is 10A switching regulator by use IC L4970A. Then build easy as an example integrated readymade circuit. Important point be power supply input must have 10A current sizes then can give power get enough. The detail is other of the circuit
Switching power supply Regulator 0-40V 4A by L296
Specificaly for the chip that is used in this circuit data are like this: Oscilator runs at freq 200kHz, output noise is below 1% (worst case), max current is 4A at 20V. Voltage can be regulated from 0, 0 V (true zero), to 40 V. Voltage and current limit, can be adjusted. You should take special care when purchasing choke. Its ferrite material shou
Soft Start For Switching Power Supply
Switching power supply whose output voltage is appreciably lower than its input voltage has an interesting property: the current drawn by it is smaller than its output current. However, the input power (UI) is, of course, greater than the output power. There is another aspect that needs to be watched: when the input voltage at switch-on is too low
low power switching regulator
This circuit is a simple battery-powered switching regulator provides 5V out from a 9V source with 80% efficiency and 50-mA output capability. When Q1 is oon, its collector voltage rises, forcing current trhough the iinductor. The output voltage rises, causing A1`s output to rise. Q1 cutts off and the output drops low enough for A1 to turn Q1.
16v power supply with MAX668 circuit
3amps power supply circuit
170w power amplifier circuit
Strobo Light using 555 timer circuit
Simple PSU circuit
3A Switching Power Supply
The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A. The schematic diagram: Component list: The schematic shows a 50-W power supply. Above circuit di
3A Switching Voltage Regulator based LM317HV
Above circuit diagram is a easy, simple and cheap switching voltage regulator which has capability to deliver adjustable voltage output range of 1. 8V to 32V and static electric current of 3A. This regulator use adjustable regulator IC of LM317HV and a power PNP transistor of 2N3792. Positive voltage regulator circuit with PNP Boost transistor The
50W Offline Switching Power Supply
The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A. The schematic diagram: Component list: The schematic shows a 50-W power supply. Here the 50W AF
Self switching Power Supply
Self switching Power Supply. One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its.
High current output switching power supply Schematic Diagram
This is low voltage high-current ouput, switching dc power supplly wiht input 220 Volts AC, In this circuit, an St2 diac relaxation oscilator, Q3, C1, and the diac, initiates conduction of the output switching transistor Q1, the on time of which is maintained constant by a separate timing / commutation network consisting of Q2, C2, SUS, an
Multiple output switching power supply circuit Schematic Diagram
This power supply uses two VN400A 400 Volts MOSFETs in a half-bridge power switch configuration. Each output consists of +5V at 20 A and 15 V at 1 A. Three-terminal regulators are used for the low-currents outputs, either 12 Volts or 15 Volts can be made available with a simple change in the transformer secondary windings. Schematic diagram belo
Switching Mode Power Supply using STR Schematic Diagram
12V 50W Switching Regulator by UC3844N
This is a simple low-cost 50W off-line switching power supply, which can be used for home projects or to learn operation of flyback converters. It can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more then 4A load. Line and load regulation is better then 0. 5%. The unit has overcurrent, overtemperature and ove
A 12 Volt Switching Power Supply
About this Circuit This is a good Circuit for those persons needing to Boost or drop a voltage. The Output is High Frequency, but can be Rectified and Filtered to give DC Out. When Rectifying High Frequencies, You MUST use the Appropriate types of HIGH SPEED Diodes to handle these frequencies. Normal diodes WILL OVERHEAT and Burn out. This Circuit
Free Energy Circuits
Battery Charger Circuits
AC-DC & DC-DC Circuits
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Current Limiting Circuits
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High Voltage Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
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