Voltage Inverter Circuit


This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input. 

It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery. 

Servo Amplifier current negative feedback


current-negative-feedback
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Automobile Light Fader


light-fader-circuit
Here the circuit diagram of Interior Light Fader for Automobile. 

The circuit is build using low power operational amplifier LM324 which only need around 3mA of current, so it won't bother the battery supply if left connected for extended periods. 

Battery Charger for NiCad Batt

charger

This battery charger circuit is designed for recharging NiCad batteries based on an AC-powered current source method. 

It can crank out as much as 1 amp and can be modified to go even higher by choosing different devices for Q1. 

Since this circuit uses AC line voltages and currents, please exercise extreme caution during assembly, turn-on, and test.

Solar Battery Charger Circuit Schematic

solar-charger

Here is a solar charger circuit that is used to charge Lead Acid or Ni-Cd batteries using the solar energy power. 

The circuit harvests solar energy to charge a 6 volt 4.5 Ah rechargeable battery for various applications. 

The charger has Voltage and Current regulation and Over voltage cut off facilities.