[sdiy] Using 2164 with single supply

Tim Ressel timr at circuitabbey.com
Sat Mar 9 04:47:29 CET 2019

There are probably internal structures that drop too much voltage to 
operate at lower than 8 volts. My guess would be constant current 
sources and sinks. But its really moot. The data sheet sez it, so youz 
do it  ;-)

You could rig a voltage doubler to power to run the 2164. I once did 
that to run an LCD on 3.3 volts. Just a 7555 and some diodes and caps.

--Tim (kluge-O-matic) Ressel

On 3/8/2019 7:39 PM, David G Dixon wrote:
> 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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--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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