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LF: Re: Farnell H60/25 PSU

from [James Moritz] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: Re: Farnell H60/25 PSU
From: "James Moritz" <[email protected]>
Date: Tue, 22 Nov 2011 17:08:05 -0000
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Dear Mal, LF Group,


Hi Jim/M0BMU es co
Do you have a cct diagram for this psu Farnell H60/25. I bought one recently and could do with some cct info.
I have been working away from home for some weeks, hence the delay in replying... I have scanned the schematics for this PSU and they can be downloaded as a pdf from: 
http://dl.dropbox.com/u/50525290/FarnellH6025.pdf
I have used this PSU for some time to power my Decca TX. There are some things you should be aware of:
It uses a thyristor pre-regulator with linear output regulator - quite a popular configuration in its era for high power PSUs. The thyristors are connected directly in series with the mains input. The switching waveforms result in high peak mains currents with flickering house lights etc., which might cause MCBs to trip with modern domestic wiring. It has a hefty mains RFI filter with 0.1uF capacitor from L - E, which might also trip modern RCDs
The regulation is pretty good for slowly varying loads, but it does not like on-off keyed tramsmitters as a load. Going abruptly from zero to full load causes a large transient dip in output voltage. A large electrolytic capacitor across the PSU output is helpful.
To make it work, the external (analogue) programming inputs on the back panel terminal strip have to be correctly linked. For normal operation, the links are B-C-J, D-E-F, G-H-K.
Over the years I have had to replace all 4 pass transistors in the output regulator. These usually fail s/c, which causes the PSU to shut down. 

Cheers, Jim Moritz
73 de M0BMU
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