In this small switching power supply, a Schmitt trigger oscillator is
used to drive a switching transistor that supplies current to a small
inductor. Energy is stored in the inductor while the transistor is on,
and released into the load circuit when the transistor switches off.
2 Watt Small Switching Power Supply Circuit Diagram
2 Watt Small Switching Power Supply Circuit Diagram
The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts. Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode. The efficiency is about 80% using a high Q inductor.
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