Caution: Power Supplies!!

Rowena Larkins rowenal at
Mon Mar 23 05:25:34 CET 1998

> But seriously, house current is nothing to take lightly and some simple rules of use will permit you to test it and build it safely.  Always remember to *unplug* the PSU (not just switch it off locally or on a switch box) before you work on it, connect probes to it, etc.  Then when everything is set and safe (for example, no stray tools laying across it), plug it in and test it.  Safety glasses are a good idea because parts can go pop and emit smoke and debris when things go wrong.  And finally package it safely when you're done making sure you've covered all "hot" terminals.  It's simple but needs your constant attention.
> John Speth
> Object Engineering, Inc.
> johns at
> -----Original Message-----
> From:	Milliams [SMTP:Milliams at]
> Sent:	Friday, March 20, 1998 10:46 AM
> To:	Synth-DIY at
> Subject:	Caution: Power Supplies!!
> Most books I've seen for modules n'stuff, recommend that I start building a
> +/-15v power supply. But somewhere in the design it says "Caution: If you are
> unskilled at working with 110v AC, do not attempt this project!!". Well, if
> it is logical to start with the power supply, how do I become "skilled at
> working with 110v AC"?
> Sincerely,
> A cautious (don't wanna die!!) boy

Which explains the large indentation on the aluminium front panel of my synth.
( a stray hot wire brushed against the cabinet once. It seems the ionisation 
of the cabinet protected the house fuses really well!!)

Here in Aus it is 240V, not 110V.


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