[sdiy] Using 2164 with single supply

Tim Ressel timr at circuitabbey.com
Sun Mar 10 20:19:44 CET 2019


Also the LT1054 is good for 100mA of current. The 555 solution may not 
go that high. Downside: $3.31, and it wants slightly pricey caps.

--tr

On 3/10/2019 11:54 AM, Jay Schwichtenberg wrote:
> David,
>
> You might check out the difference between the 555 and the LT1054 (not
> LP1054) as far as current draw and grounding. The 555 has issues with
> switching states and current draw. Usually you do not want to put the 555
> ground with the signal ground because it can cause problems. I do know if
> the CMOS versions of the 555 are better. Might be something to do some
> research on if you don't already know the issues.
>
> Jay S.
>
> -----Original Message-----
> From: David G Dixon [mailto:dixon at mail.ubc.ca]
> Sent: Saturday, March 09, 2019 5:58 PM
> To: 'Jay Schwichtenberg'; 'SYNTH DIY'
> Subject: RE: [sdiy] Using 2164 with single supply
>
> Interesting.  However, I'm thinking that it might be easier in my case to
> use a 555 to double the voltage and run the 2164 and associated opamps on a
> single supply of about +8V.  There is some good guidance in the datasheet
> about how to do that, and my simulations suggest that a 555-based doubler
> circuit running on 4.5V should give about 8.25V, so that's enough.  Also,
> the circuit is simple and uses things I've already got on hand.
>
>> -----Original Message-----
>> From: Jay Schwichtenberg [mailto:jschwich53 at comcast.net]
>> Sent: Saturday, March 09, 2019 9:17 AM
>> To: 'David G Dixon'; 'SYNTH DIY'
>> Subject: RE: [sdiy] Using 2164 with single supply
>>
>> 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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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com



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