Variable Dummy Load for Power Supply Testing. How to test a voltage source to know if it is good or not?. What is the percentage regulation?.

Transistor – Zener diode Voltage regulator circuit. This circuit delivers an output voltage established by the voltage of the zener diode less 0.7 volts

Dual polarity variable power supply (+/- 15 volts). Voltage source with a maximum amplitude of +/- 15 volts and a current of up to 1.5 amps.

This 12 to 5 volt converter circuit is very useful. It can be used to connect 5 volt electronic devices in a car with a 12 volt battery. (Automotive lead-acid batteries can be up to 13.7 volts).

This 12 volt power supply circuit is simple and very useful. Sometimes a 12 Volt power source is needed, and we only have 5 or 9 volt regulators (7805, 7809)

Very simple variable voltage regulator with very few components. Output Voltage from 5 to 30 volts

Totally transistorized with 0 to 30V output voltage range. It can be used for projects where the current consumption is 1A max.

This surge protection circuit is placed between the DC voltage source and the circuit that you want to power. This circuit delays the voltage given by the power source and allows the voltage to be applied to the circuit or device a few moments later.

This 12V Power Supply has, as its main characteristic, a low output impedance. This is a very desirable feature in voltage sources and is achieved with a large open loop gain that the operational amplifier has.

This simple Inverter for fluorescent lamp circuit uses the 555 timer, a transformer and a transistor. Useful to use with a car battery.

The 5A variable power supply uses the LM338 voltage regulator. This regulator works in the same way as the LM317 adjustable voltage regulator known to all.

This 12VDC to 24VDC step up converter is very useful to power devices that run on 24 VDC when we have a 12VDC voltage source as it could be a car battery or alike.