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Re: Need help with a battery charger
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Posted by KEB on February 24, 2006 at 14:06:06 from (192.91.171.42):
In Reply to: Need help with a battery charger posted by '52 Farmall H on February 24, 2006 at 08:37:28:
Quick response, I"m at work & can"t take much time. The heavier wiring is the low voltage output side of the transformer. This looks like a center tapped output winding, which would only use two diodes instead of the four found in a full wave bridge, hence only having three connections to the diodes. Assuming this is a center trapped transformer, and (CAUTION - assumption) assuming someone hasn"t messed with the connections, the (-) output would be the unused terminal at the top of the transformer & the (+) output would be the unused terminal on the ammeter. The small glass tubes are fuses. The fact that they"re black indicates they"ve blown, which probably indicates there are bigger problems with the unit than simply missing wires. The transformer should self-limit its output current to a safe value if the output is shorted, as it has to be able to accomodate discharged batteries without damaging itself or the battery. If there"s been enough current through the transformer secondary to blow the fuse, there"s a good chance the diodes and/or the ammeter are also toast. You"d be very wise to find someone with a good low-range ohmmeter & have them check the transformer windings for shorts before applying power. The switch selects one of two taps on the primary (AC input) side of the transformer to give the proper output voltage. One side of the AC line most likely connects to the unused terminal on the bottom of the transformer, and the other AC line connects through a fuse to the unused center terminal on the switch. I can"t see enough detail to see how the second fuse is wired. My suggestion, unless you"re just looking for a project, is to throw it out & go buy a new one. If you insist on playing with this one, the fuses can be replaced with type 3AG using in-line holders that you can buy at any auto parts store. Just make sure you use a fuse rated for 250 volts (most 3AG are) on the AC input side - don"t use the flat blade type automotive fuses. The flat blade type should be OK for the low voltage, high current side. The output fuse should be a little bigger than the maximum reading on the ammeter. A couple amps is probably enough for the input fuse. BE CAREFUL! Its easy to get zapped from an exposed terminal, or get the transformer hot enough to burn if there has been a short somewhere. Keith
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