[sdiy] blowing fuses

Richie Burnett rburnett at richieburnett.co.uk
Sun Feb 16 18:46:08 CET 2020


Usually the rating label tells you what fuse to fit?

-Richie,



-----Original Message----- 
From: ColinMuirDorward
Sent: Sunday, February 16, 2020 2:43 PM
To: Richie Burnett
Cc: *SYNTH DIY
Subject: Re: [sdiy] blowing fuses


Thanks Richie.
I should have mentioned, it's a transformer/linear supply.
Not only us it eating fuses for breakfast, but dinner, too. In a couple 
hours, I'll be able to test lunch.
So I suppose there is some faulty (or non-existant) inrush current 
protector, and it's costing me one fuse to charge up whatever is sucking 
those amps?



On Sun, Feb 16, 2020 at 12:36 PM Richie Burnett 
<rburnett at richieburnett.co.uk> wrote:
If it's a SMPS the inrush current at turn-on will probably eat quick-blow
fuses for breakfast.

-Richie,



-----Original Message----- 
From: ColinMuirDorward
Sent: Sunday, February 16, 2020 2:21 PM
To: *SYNTH DIY
Subject: [sdiy] blowing fuses


Maybe someone has some suggestions for me.

I'm blowing fuses on my "industrial" power supply. This is a salvaged
+/-15v, 3a supply housed in a rugged metal enclosure. I've wired it up with
a fuse on the AC mains side, and fuses on the +/-15v side. The AC/mains fuse
is giving me grief.

Step1) I can turn the unit on, and everything is fine. My synth is only
drawing 1/2 an amp (or nothing when disconnected).
Step2) Turn the unit off. At this point, I can remove the mains fuse, and
test it: yes, still good.
Step3) Re-install fuse, switch on. Nothing. Remove fuse and test again, now
it's blown.
Step4) Install new fuse. Go to Step1)

I haven't used the PSU much yet, but I've powered it on and off loads of
times and this problem never manifested till now. The fuses are 2amp, 250v,
which I think is fine, but here is maybe my mistake: they are quick blow
type. I'm uncertain, though. Wondering if I need to try to find a fault in
the PSU, or just order the new fuses. But why didn't those quick blow fuses
break before?

Thanks for reading!
Colin


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