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 Forum index » DIY Hardware and Software » The layout factory
Building Rick's Formant VCF on Perfboard... LM329?
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JRock



Joined: Mar 05, 2010
Posts: 87
Location: Bucks County, PA
Audio files: 1

PostPosted: Wed Dec 01, 2010 6:10 pm    Post subject: Building Rick's Formant VCF on Perfboard... LM329?
Subject description: Where do I connect pin 1 of the LM329???
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Hi. I found this and I'm building it on perfboard.

http://dropmix.xs4all.nl/rick/Emusic/Moog/moogvcf_schematic.gif

Down @ the temperature control section (at the bottom) there is a LM329.
They show the zener diode connections for pin 2 and 3 but how do I connect pin 1? Should I just connect +15V to it?

Here is the datasheet for LM329

http://www.datasheetcatalog.org/datasheets/185/49455_DS.pdf

Thanks
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magman



Joined: Feb 04, 2009
Posts: 363
Location: Liverpool, UK

PostPosted: Thu Dec 02, 2010 12:06 am    Post subject: Reply with quote  Mark this post and the followings unread

I've read the data sheet for the LM329 differently than you have, I see the connections as being pins 1 and 2. There doesn't appear to be any connection to pin 3 in the TO-92 package at all. In fact, looking at the schematic diagram for the LM329, there are only 2 connections.

I would see pin 1 connected to ground and pin 2 connected to the junction of R1, R2 and R3 in the VCF schematic.

Hope this helps.

Regards

Magman
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JRock



Joined: Mar 05, 2010
Posts: 87
Location: Bucks County, PA
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PostPosted: Thu Dec 02, 2010 12:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Hahaha. I had read a different datasheet earlier and the pin numbers were reversed. I didn't even check this one. I assumed they would all be the same Embarassed

Cool. So Pin2 I have hooked up correctly then...

Are you saying that the bottom rail with the Sensor/Clamp should be connected to ground? Good thing I check with you guys Very Happy


Thanks MagMan!
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magman



Joined: Feb 04, 2009
Posts: 363
Location: Liverpool, UK

PostPosted: Thu Dec 02, 2010 12:51 am    Post subject: Reply with quote  Mark this post and the followings unread

JRock wrote:
Are you saying that the bottom rail with the Sensor/Clamp should be connected to ground? Good thing I check with you guys Very Happy

Yes.

If you check the PCB layout, you can see this part of the circuit shares the same ground as the rest of the circuit.

Regards

Magman
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