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4 juin 2019 2 04 /06 /juin /2019 18:26
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Daniel Savastano 15/07/2019 18:32

I am rebuilding my Arp 4034 filter and came across your modified schematic. I was wondering why you removed R28 and connected C3 to ground? What effect does this have on the filter?
Thank You.

J Verghese 23/07/2019 19:17

Hi, as far as I know the modified schematic represents the earlier revision of the 4034 filter. I believe R28 was added and C3 reconnected in later versions in order to avoid transient currents at power up/down. As you may know, the +/-15V supplies typically fluctuate heavily for a short while when switching the synth on or off.

Nicolas 07/06/2019 20:04

Hello. The 4019 files repeat the 4015 ones.

Dave 05/06/2019 22:05

Your files for the 4019 VCA are wrong. They are all the previous 4015 S&H files