This is the design for power supply. . This supply uses no heavy step down transformer and has an extremely low parts count. The circuit can be built very small and can supply small currents for small projects. This is the figure of the circuit.
The value of C1 can be increased to increase the amount of current the circuit can supply. With the values shown, the circuit can supply up to about 15mA. Remember to increase the size of C2 also. You may want to add a resistor in series with C1 to limit current if the circuit is plugged in and the mains is at its full voltage. If you are running the circuit from 220VAC, then use a capacitor rated at greater than 400V for C1. If you want isolation from the AC line, you can connect up a small isolation transformer at the inputs of the circuit. Small 600ohm audio transformers work nicely.
Part:
C1 0.39uF 250V Capacitor
C2 220uF 25V Electrolytic Capacitor
D1 1N4741 11V Zener Diode
BR1 1 Amp 200V Bridge Rectifier
The value of C1 can be increased to increase the amount of current the circuit can supply. With the values shown, the circuit can supply up to about 15mA. Remember to increase the size of C2 also. You may want to add a resistor in series with C1 to limit current if the circuit is plugged in and the mains is at its full voltage. If you are running the circuit from 220VAC, then use a capacitor rated at greater than 400V for C1. If you want isolation from the AC line, you can connect up a small isolation transformer at the inputs of the circuit. Small 600ohm audio transformers work nicely.
Part:
C1 0.39uF 250V Capacitor
C2 220uF 25V Electrolytic Capacitor
D1 1N4741 11V Zener Diode
BR1 1 Amp 200V Bridge Rectifier
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