Description: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. The major downfall of this supply is that it is not isolated from the AC line and can only supply small currents
Schematic:
Table Of Components:
| Part | Total Qty | Description |
| C1 | 1 | 0.39uF 250V Capacitor |
| C2 | 1 | 220uF 25V Electrolytic Capacitor |
| D1 | 1 | 1N4741 11V Zener Diode |
| BR1 | 1 | 1 Amp 200V Bridge Rectifier |
| MISC | 1 | Line Cord, Board, Wire, Case |
1-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.
2-Please note that this circuit is not isolated from 120VAC. Because of this, the circuit must be treated with caution and encosed at all times. Do not work on the circuit (or any other circuits attached to it) when it is plugged in.
3-If you are running the circuit from 220VAC, then use a capacitor rated at greater than 400V for C1.
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