Elektor Formant Modular

Hi,

Unfortunaelty my adsr worked fine so report was very limited with details 
about it. Is it a new module MSS2000 or the old one.

Lets take it easy and look at what you have and should have.

Power supply.
(please be aware that I am using no colours here as many people change wire 
colours.)

Get the schematic out for the powersupply you are using.
On the schematic the solder pads are labelled, If you're lucky your board 
will also be labelled.
if not match it up with the one in the book and find all your power lines.

By the sounds of things your supply has went wrong or is being connected 
wrong.

Test the wires, connect your black probe to the ground of the power supply 
to wall socket. then the red to the Ov line out. This should read 0v,

Then test +15v and -15v the same way. LABEL your wires at this point. Saves 
time in future.

Confirm this section before doing anything else.

Kris
P.s I lost my copy of the original book so having to retrieve it again, 
should be able to help more next time.


>From: "markfrancombe" <mark@...>
>Reply-To: ElektorFormant@yahoogroups.com
>To: ElektorFormant@yahoogroups.com
>Subject: [ElektorFormant] HELP with hot problm...
>Date: Mon, 08 Aug 2005 21:48:05 -0000
>
>OK I have tidied up my Old Formant PSU, Hurrah.. looks nice, stuck my
>(misunderstood) voltmeter on the wires and I get +15 where it should
>be +5 where THAT should be.. 0 on well um.. zero.. but.. how do I
>know it the -15 is working? (tried reversing the red and black
>probes.. no effect).. Anyway seems to be working... so
>
>I connect up an ADSR. Now thos of you that remember, I blew one, I
>think, connecting to my Blacet PSU... Now I know I blew it.. dead..
>so I chnge the IC's (yes I had cleverly bought a bunch of spares..)
>now when I connect (and please bare in mind that THIS ADSR used to
>work on THIS PSU) I feel the IC's and sure enough.. one is heating
>up ... I pull the plug.
>
>What do I know? My ADSR is blowing (maybe on ALL PSU's) particularly
>on one IC? Maybe the old ones are OK? (apart from this one)
>
>Questions?
>
>Well, How can I find out why this is happening.. believe me Ive
>stared at the circuit long enough looking for breaks and blobs etc...
>
>maybe its time to try a different module? a VCO perhaps?
>
>Next time I plug it in Im going to use a resistor to cushion the
>voltage
>
>Kris, you said you may have some way of telling if modules worked?
>you said...
>I think I have some test sequences in my report if you want
>I'll send you it ..
>er.. yes please!!
>
>
>
>