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:
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
>>
>>