Source for replacement caps in H744 regulators
elson at pico-systems.com
Thu Jan 6 20:39:07 CST 2022
On 1/6/22 6:04 PM, Matt Burke via cctalk wrote:
> Quiet regulator: http://www.9track.net/posts/h744/h744_ba11_q2e.png
> Noisy regulator: http://www.9track.net/posts/h744/h744_ts11_q2e.png
> The yellow trace is the emitter of Q2 (input of L1) and the cyan trace
> is the output of L1. Q2 seems to be switching partly on then fully on in
> the noisy regulator. it should of course be fully on or fully off as
> seen on the quiet regulator. Also the switching frequency seems to be lower.
Yes, the 2nd unit is running at 5 KHz, clearly explaining
the noise. Possibly there is a bad flyback diode, or
something causing the different waveform.
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