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
In the field of consumer reports electronics products reviews, product size, weight is toward smaller, lighter direction, high-power single-chip audio power amplifier needs of increasingly prominent, TDA7294 is currently the best performance, the biggest single-chip audio power amplifier One.
Automobile Light Fader
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.
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