[sdiy] EFM MIDI-Gate?

[Dave Kendall]

Hi.

FWIW, I stuffed the board years ago, but never tested it. However I 
made a couple of notes when examining the circuit traces.

Silkscreen error:  +5V and GND down near the 7805 voltage regulator are 
incorrectly swapped over. +5V should be nearest the edge of the board.
It works, but the silkscreen is wrong..... (batch number H&L - 1 5100)

D1 should be jumpered. LED is not used. (don't know why - I think I got 
that from Tom G's notes some time....) The pad nearest to the legend J1 
is ground, the pad connected to junction of D1 and R1 is +15V or +12V.

C2 is a 10uF electro (25V ). The negative is connected to GND, ie. 
facing in towards R8. (did I sub the ceramic caps? Hmmmm)

I haven't got the board in front of me, so can't check exactly why I 
wrote this stuff.

Hope this helps anyway...

cheers,
Dave



On Nov 12, 2009, at 06:08, Chromatest J. Pantsmaker wrote:

> So, I'm starting to revisit some old projects... The first of which is
> the EFM MIDI-Gate interface.
>
> I have one built, but at the time when I built it, I couldn't get it
> to work.  That was roughly in 2000 or so.
>
> I have the original PDF file, but as I remember, there were often
> extensive re-work notes for each EFM board produced.
>
> Does anybody have those notes?
>
> Does anybody have a working MIDI-gate who could help me troubleshoot 
> mine?
>
> -- 
> .sig
> -Chromatest J. Pantsmaker
> http://www.chromatest.net
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