Moderators: Dave Moll, Andrew Davie, Steve Anderson
Klaas Robers wrote:I expected that your FIR-filter will replace the analogue butterworth filter.
Steve Anderson wrote:Harry, yes the first circuit is valid and works as advertised. BUT the ripple is now at 50Hz (or 60) rather than 100Hz (or 120). Which means more ripple the regulators have to get rid of, and for the same load generally larger capacitors are required and therefore higher peak currents in the diodes and transformer, this results in higher heating of the transformer windings. Generally half-wave rectification is less efficient than full-wave. If the load is very light, then OK, but if you're wanting to use the transformer to it's full capacity then full-wave is far better.
I've not had a problem with getting centre-tapped secondary transformers, e.g. 12V-0V-12V rather than just a single 12V secondary. If you're using old phone-chargers or other 'wall-warts' then you may get stuck.
[/quote]As for the second circuit, I've never tried that arrangement, I've seen similar a few times in the past, but it's messy, uses more components, it simply doesn't look 'right' to me. Get the right transformer for the job is my advice. Or get a second one. In my opinion it's a 'botch'.
Steve A.
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