[sdiy] power supply pain

[John L Marshall]

What are we talking about here? 150 Watts total? In the UK you need the
extra heat eleven months of the year so that the knobs won't freeze.

John
Seattle

----- Original Message -----
From: Tony Allgood <oakley at techrepairs.freeserve.co.uk>
To: Synth DIY <synth-diy at node12b53.a2000.nl>
Sent: Sunday, May 27, 2001 7:02 AM
Subject: Re: [sdiy] power supply pain


> >There's a +/- 18.5V regulated supply in the cabinet, and smaller +/-
> 15V supplies on the various PC boards. Seems to work well. Keeps the
> heat on the PCB's to a minimum.
>
> Yes, I like pre-regulators. But it does increase the overall heat
> dissipation in the whole unit. You have to consider the input voltage
> overheads for the both the regulators, 5V as opposed to just 2.5V for
> 78s, which would double the heat loss in regulator system for worse
> case. However, with the newer low drop-out stuff, this is less of a
> problem. Stability is worse though for the LDO regulators.
>
> Mind you this is insignificant when you consider that for European
> supplies you can get, in theory, a range from 200V to 264V from the AC
> line. So you design for worse case headroom at 200V only to find in the
> UK, we are (still) using 240V and dissipating heaps.
>
> Regards,
>
> Tony Allgood  Penrith, Cumbria, England
>
> Oakley Modular Synth and TB3030:
> www.techrepairs.freeserve.co.uk/projects.htm
> My music: www.mp3.com/taklamakan
>
>
>
>