[sdiy] Using 2164 with single supply

Jay Schwichtenberg jschwich53 at comcast.net
Sat Mar 9 18:17:17 CET 2019


David,

I'd look at the Shruthi pole mixing filter schematic. Think they use the
same technique on other Shruthi filters too.

The circuit uses a 2164 with a LP1054 to generate +/- and 7805 and 7905
regulators to get the volts it needs.

Good luck.
Jay S.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of David
G Dixon
Sent: Friday, March 08, 2019 7:40 PM
To: 'SYNTH DIY'
Subject: [sdiy] Using 2164 with single supply

Hey Team!

I want to use 2164 to build a VCA for a circuit-bending application, where
the circuit only has a single supply.  Of course, I want to use 2164, and
the datasheet shows how to use it in single supply mode.  However, it
specifies a minimum rail voltage of +8V.  The thing I want to circuit-bend
(a Marantz cassette deck) runs off of a 4.5V supply.

So, I guess my question is, why couldn't I run the 2164 (and any associated
opamps) from a 4.5V supply?  Does anyone have any insight into why +V must
be at least +8V?

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