The "big" switching regulator (dc/dc converter) you can see on the logic board near the battery compartment is for generating "high voltage" for the display light. It is built in discrete parts using the transformer which generates the famous wining sound...
I do not know which regulators are used to stabilize 5V and 3.3V, but probably those are linear regulators.
Johannes
-----Ursprüngliche Nachricht-----
Von: Frank Gruendel [SMTP:Frank_Gruendel_at_t-online.de]
Gesendet am: 11 December 2001 00:09
An: newtontalk_at_newtontalk.net
Betreff: [NTLK] Switching regulator in the 2000
> Just curious, do you know which switching regulator is in the 2000?
No idea. I've not yet dared to open my beloved 2000 yet, I have had it
only for a couple of weeks. We are still too much in love...
> think the 2000 runs most of the logic of 3.3V
I agree. This was state of the art in 1997. I wouldn't be astonished
if part of the 130's electronics was 3.3 volts, too.
> I am not sure who said this, but I don't think it was me, perhaps the
> other gentlemen who suggested the diode bit.
Yep, I was answering two mails at the same time to save bandwidth.
Sorry!
Frank
Newton software and hardware stuff at www.pda-soft.de
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