Cgs synth

I've actually found that despite the TL072 not going to its negative rail,
it is better even single rail situations, depending on what the output is
driving (e.g. CMOS is fine). It seems the LM358 specs are all over the
place. Some are good and reliable, and some have very poor slew rates.

Ken

>I have substituted the TL072 for the LM358 in many CGS comparator
>circuits with good results. The one place you probably should not do
>this is when the power supply is not dual, i.e. pin 4 is grounded
>instead of -15V. The LM358 handles the single supply better, I believe.
>
>For example, in the Infinite Melody, IC2 can be a TL072, but IC1 cannot.
>
>-Richard Brewster
>
>xamboldt wrote:
>
>>Thanks, Ken! You nailed it. Actually, both of the things you pointed out
>>were wrong. The previous owner had installed a 1uf cap instead of a 1nf cap
>>on the RC filter. I changed that, but the problem persisted. So I swapped
>>out the LM358 for a TL072 and the problem vanished. I must say I'm amazed at
>>your long-distance diagnosis. Thanks again!
>>
>>-Chris
>>
>>On 8/13/05 7:09 PM, "sasami@..." <sasami@...> wrote:
>>
>>
>>
>>>Sounds like the delay isn't working, or is too short.
>>>
>>>Also, if you are using a LM358 as the input processor, switch it to a TL072
>>>- it may be the the LM358 is too slow, giving a poor clock signal.
>>>
>>>Ken
>>>
>>>
>
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
>
>
>

_______________________________________________________________________
Ken Stone sasami@... or sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>