[sdiy] Elektron

Gordon JC Pearce gordonjcp at gjcp.net
Mon Dec 30 18:11:23 CET 2013

On Mon, Dec 30, 2013 at 05:53:08PM +0100, Jean Bender wrote:
> Hi everybody !
> I've just bought an Elektron Machinedrum sps 1 ( first generation).
> The friend who sold it to me tested it before shipping, and it was
> working.
> Once i tried to plug it, it never started. I fisrt thought it wa sue
> to the external power supply ( it should give a 6v AC out), but no..
> except if 7,23v AC out is too bad..
> So i opened my sps1. The fuse is ok, the power connector also.. i can
> get my ac voltage at the fuse output.
> After that.. nothing. There are many regulators, but for most of them
> i can't figure how they work. I've just check a lm7808 and a lm317
> that don't deliver good voltages..
> And visually, no component seems to have burn..

LM7808 and LM317 are pretty standard chips, and you can just read the datasheet for them.

You should see 8V between the centre and right-hand pin of the 7808, and something rather more than 10V between the centre and left-hand pin, for a start.

Gordonjcp MM0YEQ

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