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Old 1st Jun 2019, 4:19 pm   #6
Phil G4SPZ
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Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
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Default Re: Hacker Autocrat RP33

Yes, well done indeed!

Quote:
Originally Posted by Hybrid tellies View Post
This same cap can cause all sorts of strange problems on other Hacker radios.
And not just on Hacker radios. I’ve encountered exactly the same fault on Philips, Grundig, Yaesu, Aiwa, Sanyo and many other makes of equipment where an electrolytic capacitor is used to decouple a resistively dropped supply rail. Electrolytic caps of this vintage are presumably coming to the end of their working life, albeit after several decades. They can of course fail open-circuit as well, and I’ve come across several of those, but going short-circuit is the most common failure mode in my experience.

Such a failure will put stress on the dropper resistor, which is often a low-wattage component, so it’s worth checking that as well before you box it up.
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Last edited by Phil G4SPZ; 1st Jun 2019 at 4:20 pm. Reason: Layout
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