Re: [sdiy] CMOS as voltage variable resistor

[jhaible at debitel.net]

>I think the cmos ic 4007 is used in a couple of adsr circuits ,
>for example in the Arp omni and the Korg PS3200 .
>but I'll have to look at the schematics to see if its used as a volatge
>variable resistor.

In the 3200, the 4007 is used as switch and inverter only.
VC resistors are done with bipolar transitors and with LDRs.

ARP used the 4007 for many applications, including VC resistors.
(http://home.t-online.de/home/jhaible/hj_qph_1.gif - not the
original ARP circuit, but the VC resistor part is used as in the
original.)

JH.