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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 9th Jul 2019, 9:18 pm   #1
stuart_morgan_64
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Default Weir Majoreg 441 power supply

I have used this for many years, useful because of the higher voltage end. However it adjusts from 0 to about 3V now. Has anyone a circuit, or any advice please. Thanks
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Old 10th Jul 2019, 6:21 am   #2
Diabolical Artificer
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Default Re: Weir Majoreg 441 power supply

Telford show as having several Weir manuals, see - http://www.telford-electronics.co.uk/manual.php?alpha=w but no 441, give em a ring.

Noticed that red wire looks loose, so check wiring and any connectors but things to look for on linear PSU's, check trannies especially the big series pass trannies arn't SC, change opamps to see if that helps and check to see if the sense resistor is ok ( big green R or big R near OP). Your PSU will follow a pretty standard topology with either a 723 voltage reg chip or a normal opamp. Look at Farnell L series PSU's to get an idea.

Yours looks pretty simple check the tfmr sec is correct, then the bridge rectifier/diodes are ok, check for any bad caps and zener diodes that are dead.

Andy.
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Last edited by Diabolical Artificer; 10th Jul 2019 at 6:26 am.
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Old 11th Jul 2019, 2:36 pm   #3
stuart_morgan_64
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Default Re: Weir Majoreg 441 power supply

Thanks for the comments will have another look tomorrow evening.
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