Simple Negative Feedback Series Voltage Stabilizer Circuit

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This is a design circuit for more complex series voltage stabilizer circuit, utilizing an operational amplifier (IC1) to 'slow down' or turn off the load transistor Q1 when the output voltage is excessive. This is the figure of the circuit;

The zener diode ZD1 in this circuit is just used as a reference voltage for defining the threshold at which the op amp will turn Q2 and Q1 on or off. Because of this negative feedback mechanism, power is consumed more efficiently, since the load is only supplied with current when it needs it.

Simple Basic Symmetric Power Supply Circuit

This is a design circuit for the basic for standard symmetrical power supply. If your circuit need high current then this circuit is suitable. This is the figure of the circuit;

You need a center-tapped transformer to build this symmetric power supply. This power supply circuit is widely used in op-amp application, as well as in high-rated power amplifier.