Digest for sci.electronics.repair@googlegroups.com - 4 updates in 2 topics

8:40 AM Penedão
"Peter W." <peterwieck33@gmail.com>: Dec 26 04:01AM -0800

Yo, Drongo:
 
I waited until after Christmas - my bad. But as a New Year's present, I wish to reassure you that your position as Village Idiot is secure. You DO NOT have to compete for it.
 
Peter Wieck
Melrose Park. PA
"jurb...@gmail.com" <jurb6006@gmail.com>: Dec 25 10:06AM -0800

Not hard. Look at the -B2 regulator circuit. The reference which is direct is two Zeners, WZ-270. In series they add up to 54 volts. That will approximately be the regulated output.
Tim Schwartz <tim@bristolnj.com>: Dec 25 09:08PM -0500

> Not hard. Look at the -B2 regulator circuit. The reference which is direct is two Zeners, WZ-270. In series they add up to 54 volts. That will approximately be the regulated output.
 
Hi there,
 
 
I'd agree, but the diodes are buring up hot, and I'm using 1 watt in
place of the half watters. Several of the resistors have been replaced
before, and I'm wondering if there is an error in the schematic as to
the part value. I've replaced the pass transistor and dual diode as well.
 
Thanks!
Tim
Phil Allison <pallison49@gmail.com>: Dec 25 09:47PM -0800

Tim Schwartz wrote:
 
> place of the half watters. Several of the resistors have been replaced
> before, and I'm wondering if there is an error in the schematic as to
> the part value. I've replaced the pass transistor and dual diode as well.
 
** Try changing that 15 ohm in series with the PNP transistor to 27 or 33 ohms.
The circuit is a *current source* of about 45mA.
The load current is only about 12 mA leaving a lot for the two 27V zeners to cop.
 
 
 
..... Phil
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