[sdiy] Using 2164 with single supply

David G Dixon dixon at mail.ubc.ca
Sat Mar 9 06:24:31 CET 2019


Thanks, Tim!  It looks like the trusty ol' 555 will do what I want, and it
can be run from a 4.5V supply (just).  I've never actually built a
single-supply circuit before, so I'm sure this will be a learning
experience.  I'll keep y'all apprised. 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On 
> Behalf Of Tim Ressel
> Sent: Friday, March 08, 2019 7:47 PM
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] Using 2164 with single supply
> 
> 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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