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frequency central roland system 100m adsr problem (DIY)
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xbill88



Joined: Oct 26, 2012
Posts: 1
Location: Italy

PostPosted: Fri Oct 26, 2012 7:28 am    Post subject: frequency central roland system 100m adsr problem (DIY)
Subject description: I can't find the problem
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Hello guy , few days ago I read this old post http://www.electro-music.com/forum/topic-24627.html and I built one of frequency central roland system 100m adsr using the pcb posted.

I made the pcb, not very well (some broken trace that i repaired), soldered all components in the right place (everithing tested) , power on with 12 0 -12 V but this circuit won't work. I checked everything , with the eletric schem. but everithing is correct (I tested the pcb following the electrical schematics and everything is ok).

No enevelope signal in the main out, LED is off, anyone can help me?

Thank you.

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isak



Joined: Dec 13, 2009
Posts: 731
Location: Israel
Audio files: 18

PostPosted: Sun Oct 28, 2012 7:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello.

I'm not an expert but...I would say try to etch a new board, maybe you did a mistake when "fixing" the traces, sorry to say but it does looks like a mess.
BTW if you gonna etch a new board there is a new ver in FC site.

Cheers and good luck,
Isak E.

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frequencycentral



Joined: May 25, 2008
Posts: 186
Location: UK

PostPosted: Mon Oct 29, 2012 12:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

That PCB is verified many times, so there's a build error somewhere.

- Check that you haven't mixed up your NPN with your PNP.
- Polarity of caps/diodes are correct?
- solder bridges?

Maybe you could list the semiconductors you used?

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