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Yucky diode recovery. Advice ?
I'm helping to sort out a piece of alleged studio recording gear that was
somewhat thrown together by a bunch of useless idiots whose company has now ceased trading. It's a quasi 'replica' of some historic equipment that once belonged to Air Studios in Monserrat. The latest joy (of many!) is pickup from the PSU. I was concerned about these spikes (see pics) that the mic amp delights in reproducing. I've never seen anything as bad as this before but I don't use mic transformers myself and this unit does, which appears to be a problem. The ac line frequency rectifiers are 1N5404s. I simply tacked 0.1uF across them to see if it helped at all but it didn't. I have some UF4004s I could use instead of them (their 1 A rating is fine in this application) but I'm open to other advice. The top trace is the output of the mic amp on max gain (70dB). The bottom trace is the ripple voltage on the (half wave) rectified positive supply (only on 2nd pic). I can't figure why the spikes seem to be displaced but it's that rotten TDS210 again and I have next to zero faith in it. Sorry about the pic quality btw, I didn't take them. Graham |
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