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Old 7th Dec 2018, 2:29 pm   #21
G8HQP Dave
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Default Re: Reservoir capacitors and ripple current.

Transformer source resistance is secondary resistance plus transformed primary resistance. PSUD2 can do the calculation for you.
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Old 7th Dec 2018, 6:05 pm   #22
bikerhifinut
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Default Re: Reservoir capacitors and ripple current.

Quote:
Originally Posted by G8HQP Dave View Post
Transformer source resistance is secondary resistance plus transformed primary resistance. PSUD2 can do the calculation for you.
That saves a small calculation! ok i remodelled it as it worked out at 12.67 ohms, hasn't made much difference.
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Old 8th Dec 2018, 8:09 am   #23
Diabolical Artificer
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Default Re: Reservoir capacitors and ripple current.

One thing not mentioned is how much capacitance you need to provide X current so there's no sag, which is AFAIK is 1000u per 1A roughly, so 200u for your 300mA expected is about right.

I wouldn't worry too much Andy, just get it built but leave yourself some wiggle room if poss EG, not wrapping wires round posts and tags so things can be easily changed later.

Keep up the good work, tother Andy.
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