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Pass. p1.p preamplifer china help
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Old 14th May 2019, 07:42 PM   #11
Nelson Pass is offline Nelson Pass  United States
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Pass. p1.p preamplifer china help
It's a simple audio circuit. Volume control more complicated....
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Old 14th May 2019, 07:51 PM   #12
Ionmw is offline Ionmw  Germany
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Hello Mr. Pass,
where can I find your current attention (=on which thread) if I want to ask your help regarding more current source measurements on speakers, in addition to the SPL plots from your article on this topic?
Thanks!
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Old 14th May 2019, 07:58 PM   #13
Nelson Pass is offline Nelson Pass  United States
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Pass. p1.p preamplifer china help
The Red Eye scans the top page of this forum every morning.
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Old 14th May 2019, 08:06 PM   #14
Ionmw is offline Ionmw  Germany
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But... I would not start a thread just for my question, really. Is there any active thread with such subject that you are following and giving a bit of time, eventually could give me help?

Maybe PMs works better this case?

And btw, the red eyes may need some Visine, especially at mornings
Thanks,
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Old 16th May 2019, 04:52 AM   #15
albertNL is offline albertNL  Australia
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Pass. p1.p preamplifer china help
If it is the board I think it is, you can use the original parts. I think the cbe pinout of the small transistors is different to the ztx450/550 layout so you will need to twist the legs (use teflon sleeves to avoid contact).
I suggest you take hi-res photo of the front and back of the board. Then in software make a mirror image of the rear. It is then easy to follow the traces and compare with original schematic.
I built an AP1.7 using a similar board that was given to me. Works great. Search for my postings to see more, also about finding (and fixing!) oscillations.
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