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50W-offline-switching-power-supply – Circuit Schematic
50W-offline-switching-power-supply
The schematic shows a 50W power supply with a 5-V 10-A output. It is a flyback converter operating in the continuous mode. The circuit features a primary side ...
Low-forward-drop-rectifier-circuit – Circuit Schematic
Low-forward-drop-rectifier-circuit
A TMOS power FET, Ql, and an LM393 comparator provide a high-efficiency rectifier circuit. When V,. exceeds V,, Ul"s output becomes high and Ql conducts. Con...
Charge-pool-power-supply – Circuit Schematic
Charge-pool-power-supply
It is usually desirable to have the remote transmitter of a 4 to 20 mA current loop system powered directly from the transmission line. In some cases, this i...
Programmable-power-supply – Circuit Schematic
Programmable-power-supply
Many systems require one or more relatively low-current voltage sources which can be programmed tna few predetermined levels. The circuit shown above produces ...
Three-rail-power-supply – Circuit Schematic
Three-rail-power-supply
This circuit generates three supply voltages using a minimum of components. Diodes D2 and D3 perform full-wave rectification, alternately charging capacitor C2...
General-purpose-power-supply – Circuit Schematic
General-purpose-power-supply
The supply 6-66 can be used for supply output voltages from 1 to 35 V. The line transformer should be selected to give about1.4 times the desired output voltag...
Simple-power-supply – Circuit Schematic
Simple-power-supply
This power supply delivers plus and minus 9 V to replace two 9-V batteries. The rectifier circuit is actually two separate full-wave rectifiers fed from the ...
-15-V-1-a-regulated-power-supply – Circuit Schematic
-15-V-1-a-regulated-power-supply
The supply receives -20 V from the rectifier/filter which is fed to the collector of the Darlington pnp pass transistor, a TIP105. The base drive to the TIP105...
Hand-held-transceiver-dc-adapter – Circuit Schematic
Hand-held-transceiver-dc-adapter
This de adapter provides a regulated 9-V source for operating a Kenwood TR-2500 hand-held transceiver in the car. The LM317T"s mounting tab is electrically con...
Isolated-feedback-power-supply – Circuit Schematic
Isolated-feedback-power-supply
The diagram is a power supply circuit using the isolated feedback capabilities of the TL3103 for both current and voltage sensing. This supply is powered fromt...
Voltage-doubler – Circuit Schematic
Voltage-doubler
This circuit drives relays of 24 and 18 Vde from a 12-V power supply. Use this circuit with almost any pnp or npn power transistor. ...
Battery-splitter – Circuit Schematic
Battery-splitter
A common need in many systems is to obtain positive and negative supplies from a single battery. Where current requirements are small, the circuit shown is a...
Bilateral current source – Circuit Schematic
Bilateral current source
The circuit will produce the current relationship to within 2% using 1% values for Rl through R5. This includes variations in Rl from 100 ohm to 2000 ohm. The u...
Fast acting power supply protection – Circuit Schematic
Fast acting power supply protection
When using a regulated power supply to reduce a supply voltage, there is always the danger that component failure in the power supply might lead to a severe ove...
Simple crowbar – Circuit Schematic
Simple crowbar
These circuits provide overvoltage protection in case of voltage regulator failure or application of an external voltage. Intended to be used with a supply offe...
Power protection circuit – Circuit Schematic
Power protection circuit
To safeguard portable, emergency power repeaters from reverse or excessive voltage, Dl prevents incorrect polarity damage, and zener voltage determines the maxi...
Electronic crowbar for AC or DC lines – Circuit Schematic
Electronic crowbar for AC or DC lines
For positive protection of electrical or electronic equipment, use this against excessive supply voltage. Due to improper switching, wiring, short circuits, or ...
Simple split power supply – Circuit Schematic
Simple split power supply
This circuit utilizes the quasi-complementary output stage of the popular LM380 audio power IC. The device is internally biased so that with no input the output...
Low ripple power supply – Circuit Schematic
Low ripple power supply
This circuit may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction...
Dual polarity power supply – Circuit Schematic
Dual polarity power supply
This simple circuit gives a positive and negative supply from a single transformer winding and one full-wave bridge. Two zener diodes in series provide the volt...