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 Forum index » DIY Hardware and Software
ARP 4027-1 VCO Saw Core
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gdavis



Joined: Feb 27, 2013
Posts: 161
Location: San Diego

PostPosted: Wed Jul 09, 2014 1:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

koenpepping wrote:
Hi,

first of all thanks for sharing the vco Smile
I was looking at the BOM and noticed the ST3P switch.

my question is:
what does it do? and where can i find one?

thanks again and already!


It switches the frequency range between audio and LFO. See LF-SWITCH-A,B and C in the schematic.

Pole A changes the frequency CV, pole B switches in another capacitor at what I'm guessing is the core integrator (A and B both result in lower frequency) and pole C switches in a trimmer for the triangle shaper (presumably to improve the triangle shape in LFO mode).

I don't know what sources you have available to you but Mouser seems to have plenty of 3PST switches to choose from. You could also use a 3PDT if that's easier to find, just leave one throw unconnected.

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