parts:
| U1 | LM7812 +12 VDC Voltage Regulator |
| BR1 | 4 amp bridge rectifier |
| T1 | 18 volt, 2 amp ac transformer |
| F1 | 2 amp slow-blow fuse |
| S1 | SPST toggle switch |
| R1 | 330 ohm resistor |
| C1 | 3,000 uF electrolytic capacitor, 35 volt min. |
| C2 | 100 uF electrolytic capacitor, 35 volt min. |
| LED1 | Light Emitting Diode |
| MISC. | fuse holder, heat sink for U1, binding posts, ac cord with plug, chassis |
all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance
Please operate caution when building this power supply. It is run on standard 117 ac current - and under the right circumstances 117 ac can kill you. Use a plastic enclosure if possible to decrease chances of short-circuiting. Don't use the power supply if it's wet, and never run it without the specified fuse.
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