Elektor Formant Modular

Hello,
a good way to avoyd this kind of problem is to increase the internal resistance of your power supply. You can insert a resistor of a few hundred ohms in the +15 and the -15 V (but not the 0 V) so the intensity (and the power) will be limited. With 200 ohms, if there is a problem in your module, you have a limit of 75 mA, sufficient to identify a short circuit by analysing the temperature of the components, but not sufficient to make smoke. If there is no problem, the module will probably works in spite of the resistors.
If I remember, the ADSR module has only basic integrated circuit, not so hard to replace if they are fried.
A voltmeter is very usefull (well, very very usefull).

Good luck 

Stephen


(from France)
---------- Initial Header -----------

From      : ElektorFormant@yahoogroups.com
To          : ElektorFormant@yahoogroups.com
Cc          : 
Date      : Sat, 18 Jun 2005 13:33:53 -0700 (PDT)
Subject : Re: [ElektorFormant] Re: PSU's suggestions? (OLD THREAD)

Hi Mark,
 
congratulations first. And to the girlfriend too please.
 
15Volts is 15Volts no matter what PSU you use. Most probable your ADSR was due to blown anyway. Old modules can be tricky. check all PCB tracks before powering up I would say. If something is faulty on the power tracks you might end up giving 30Volts (15+15) to some component that was designed to be working on 15V
 
Dirk

markfrancombe <mark@...> wrote:
Hi again, 
Time has passed and, my Formant overhaul took a short break because:

a) I bought a few Blacet modules and have been building them and..
b) Discovered girlfriend is pregnant, :-)

BUT... Re: prev thread,(subject line) My Formant PSU is a messy old 
thing and I asked way back if anyone knew if it could be powered by 
the Blacet PSU (which I was buying anyway).

Well, just hooked up an Formant ADSR module to the Blacet PSU...to 
see.. and er.. no... it didnt work.. there was a funny smell and the 
IC's got VERY hot before I ripped out the power... so maybe I blew 
the damn module??

Now The Blacey is +15 0 -15 and the Formant is +15 0 -15, so WHY 
WONT IT WORK?? Should I just tidy up the Formant PSU and use it 
anyway? (It REALLY is a mess) or is there another option?

mark





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