Deleted
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Post by Deleted on May 8, 2013 10:23:55 GMT
Chris I had another close look at the schematic and it doesn't tie in with the PCB markings. It also shows some Ferranti ZTX transistors, not as labelled on the PCB. I think the schematic is not an official one and has errors.The schematic even shows FET output devices , whereas the built up PCB shows bipolar output devices, and the PCB marking does too.. The devices you have MAY be correct, but I am not confident that you will end up with a working amplifier. The output devices in the schematic start with MF, but this is more likely to be Musical Fidelity house type numbering as the Polish site suggested.
Regards Alex
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Crispy
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"Done me wrong," it's the same old song" - forever
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Post by Crispy on May 9, 2013 13:08:31 GMT
Chris I had another close look at the schematic and it doesn't tie in with the PCB markings. It also shows some Ferranti ZTX transistors, not as labelled on the PCB. I think the schematic is not an official one and has errors.The schematic even shows FET output devices , whereas the built up PCB shows bipolar output devices, and the PCB marking does too.. The devices you have MAY be correct, but I am not confident that you will end up with a working amplifier. The output devices in the schematic start with MF, but this is more likely to be Musical Fidelity house type numbering as the Polish site suggested. Regards Alex Thanks for the advice Alex, I will see If I can get a true schematic - I did ask the board supplier a while back for one, but I am still waiting so it looks like they have either forgotten/don't have one or just can't be bothered to send me one. If I cannot get a true schematic what is my best option? I don't really want to scrap the project now it has come this far Can the parts be worked out from the PCB markings? Regards Chris
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Crispy
500+
"Done me wrong," it's the same old song" - forever
Posts: 631
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Post by Crispy on May 14, 2013 8:28:27 GMT
Thanks for the advice Alex, I will see If I can get a true schematic - I did ask the board supplier a while back for one, but I am still waiting so it looks like they have either forgotten/don't have one or just can't be bothered to send me one. If I cannot get a true schematic what is my best option? I don't really want to scrap the project now it has come this far Can the parts be worked out from the PCB markings? Regards Chris Hi Alex, My board supplier has sent me a new schematic, I am no expert but it looks exactly the same as my old one If you have time could you please have a look for me and let me know what you think. They have also sent a parts list, not much use if you don't speak Chinese Where is Chong when you need him If it is the same what are my best options to get this project moving again. Thanks for your help Chris
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Deleted
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Post by Deleted on May 14, 2013 9:51:40 GMT
Hi Chris The schematic is still the same incorrect one showing FET output and some Ferranti transistors. I guess that you could try going with what you have and hope for the best. Regards Alex
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