FILENAMES: E-CLEAN2.GIF DESCRIPTION: This is a diagram for a power supply for plating, electrolytic cleaning etc. posted by Ted Edwards . Ted provided the following description: ================================================================= Power Supply for Plating, Electrocleaning and Light Duty Battery Charging E.M. (Ted) Edwards The file E-CLEAN2.GIF is a circuit diagram for a power supply suitable for electroplating, electrocleaning and light duty battery charging. The dashed line represents a box - sheet aluminum would be appropriate. Use a three prong line cord to provide a ground for safety reasons. Be sure to ground the box. The nature of plating and electrocleaning inherently means working wet. There are two fuses shown. The one to the left is to protect against a possible short in the variac. This one should be slightly larger (in Amps) than the other and can be mounted internal to the box. The second should be held in a panel mount fuse holder accessable from outside the box - this is the one that will blow if the unit is overloaded. The variac should be connected so that the output can go over the line voltage. The transformer should be 120 Volts to approximately 12 Volts for cleaning and plating - the exact value isn't all that critical. The diode bridge should be mechanically fastened to the case for heat sinking and should be rated for about 1-1/2 to 2 times the current rating of the transformer. This is because, in general, trannsformers are more tollerant of overload (especially short term) than semiconductor devices. Since (unless you're lucky at surplus/yard/flea market sales) the variac is the most expensive component, other values should be scaled to it. For example, if you have a 1 Amp variac, you could use a 120 Volt to 12 Volt, 7 or 8 Amp transformer, a 10 to 20 Amp bridge rectifier and 1 and 1-1/2 amp fuses. Other considerations: If you wish to use the unit as a "12 V" battery charger, you may wish to use a 15 to 18 Volt secondary transformer instead of 12 Volt and put volt- and amp- meters on the panel.