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Capacitors????

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jimca007:
I'm afraid old duffers like me an lots others will continue to do what we have for years suck it and see ! if it works it can't be far off being right !

Turnip:
Hi folks

Guess if some old duffers are still lose and mending -  rule of thumb applies 'till New/New Socialists re-house us for our own safety next election, and chuck the key.

Curiously, I'm a Socialist - just don't have the clip-board or pension  - born too late, and still working  -  Chris

Ohm Supplies:
If an engineer is repairing sets with a high success rate, then its always wise to keep on with what you do.
An electronic circuit is often made up of smaller circuits designed for a particular part.

 If you look at the attached datasheet for use with an ic commonly used in sets most engineers will of worked on, it gives recommended values for the components and these are then used in the circuits, they’re not just doubled in size and a larger voltage used, its only after repeated use do common faults appear.

As modern devices are often designed to do the work of several parts, they’re designed to save on extra parts and space and therefore lowering the cost. A major reason for capacitors failing is heat, adding a larger sized part might increase temperature and cause problems with the part of the circuit its used in.
This why when we’re designing kits and repairing sets we use the correct value and sized parts.

That make sence?


regards
Andy

Turnip:
Hi Andy,

Sense ?  - well not really, your third para is a problem - if replacing a capacitor with lower initial ESR than the original (selected initially mainly for economy with a limited service life in mind) Heat generated by new cap's reduced ESR will be less and reliabilty obviously greater.

Only go on about it as have chased reliabilty for a lot of years and am still in business - for some possibly good reason.

I make no observations on your kits, one way or the other, but would be happy to give 'em a go should I need to  - Chris.

tv tony:
Just browsing through the various posts and this is possibly worth a mention, we have hot air guns, stereoscopes, digital meters, pattern generators etc, our workshops, i thought, were adequate, but if you can, buy an E.S.R. meter. Ours arrived yesterday, eighty pounds + VAT/p&p. Paid for itself already in PSU repairs, its worth every penny.
Tony Walker

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