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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 23rd Sep 2022, 6:40 pm   #41
high_vacuum_house
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Default Re: Broken Tenma supply

I think the inrush current on switch on magnetising the transformer could easily pop the fuse depending on the point on the AC sinewave at the instant the contacts in the switch close. One of my big power supplies goes with a big BOING when the switch closes now and again!!

Christopher Capener
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Old 26th Sep 2022, 11:37 am   #42
Herald1360
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Default Re: Broken Tenma supply

The old Farnell H60/50 is classic for that. More of a GDUNNNNG than a BOING though

13A plug fuse best replaced with something a bit less fragile

(The main switch on the PSU is a suitably rated circuit breaker)
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