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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Phonic 740 200w Amp
Hi all,
As I've been unable to source a diagram for this model I've made an attempt at drawing it out myself. I thought I was quite 'au fait' with amp design but this one is something I haven't seen before. The outputs are 2SC5200 and 2SA1943 but there are also RFP50NO6 fet's which appear to be fed from another power line from the main semis and connect to their collectors. The o/p trannies are fed to their power rails by diodes. I've had a burn up of one channel and before I start replacing everything I want to make sure I understand how it functions. Are there any schematics out on the web with this type of design as that would save me a lot of time tracing the board. Cheers Bob |
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