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Old 22nd February 2006, 04:23 PM   #1
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Default PSU for my Leach AMP

Hi all,

I have been working on a PSU for my Leach amps.

Please comment on the schematics

Thanks for any input

\Jens
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Old 22nd February 2006, 04:46 PM   #2
Eva is offline Eva  Spain
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Which software do you employ to do these schematics?
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Old 23rd February 2006, 06:43 AM   #3
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Eva,

I have an Adobe writer on my work laptop, but try looking up cutepdf.

I lets you generate PDFs from any windows program

Any comments on the schematics?

\Jens
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Old 23rd February 2006, 12:00 PM   #4
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Jens,
would MUR810 be sufficient ?
You are planning a PS board layout ?
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Old 23rd February 2006, 12:08 PM   #5
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I will go for the MUR1560 type (15A 600V)

Yes I'm planning the PCB right now

\Jens
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Old 23rd February 2006, 01:08 PM   #6
AndrewT is offline AndrewT  Scotland
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Hi Jens,
how about leaving a resistor gap on each cap (C1, 2, 10, 11 etc) to allow RC snubbers across the rectifiers. Either link across or add R to suit.

I would raise the value of the cap discharge resistors. 10k to 20k would suffice.

I am not a believer of fuse in the supply to the rectifier. Provide a mains primary fuse and optionally secondary fuses after the smoothing caps.

A fuse before the caps has to survive a very big charging pulse and would need to be T rated as well as large value (I'm not sure your proposed T5A will survive). Then fuses in this early location are of little protection value when serious faults develop down stream.

Try adding a 100n across the bridge + to - and ~ to ~ but at the rectifier location to give best attenuation of high frequency spikes before track inductance reduces their effect.
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Old 23rd February 2006, 07:16 PM   #7
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Andrew,

Thanks I removed the fuses, see I you like the layout

Schematics first

\Jens
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Old 23rd February 2006, 07:17 PM   #8
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Old 23rd February 2006, 07:19 PM   #9
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Old 23rd February 2006, 07:57 PM   #10
Eva is offline Eva  Spain
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The capacitor that (by experimentation with real components) I have found to be optimum in order to supress the sharp turn-off spike of conventional diode bridges, without causing more ringing than it supresses, is just a single 22nF across both AC terminals of each bridge (as close as possible). No more capacitors are required, altough a RC network in paralell with that 22nF capacitor may help to damp transformer winding resonance (values here are highly transformer-dependent, the range for big EIs is probably 100nF and 47ohm).

MUR diodes are probably going to require smaller capacitances because the recovery times are an order of magnitude lower.


EDIT: Have you considered placing +Vcc and -Vss outputs near the ground output to reduce wiring inductance?
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