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 Post subject: LM358 substitute
PostPosted: Thu Apr 06, 2023 7:57 am 
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Posts: 191
Location: Michigan
I’m getting started building a delay using this vero layout: https://tagboardeffects.blogspot.com/20 ... -echo.html

I don’t have a LM358 but have several other dual opamps. Before placing an order for one part, are there any known substitutes that will work well? Here is a schematic that I found online:


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 Post subject: Re: LM358 substitute
PostPosted: Thu Apr 06, 2023 12:07 pm 
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Location: Vermont
I am guessing that (1) you don't have LM158 or LM2904, which are in the same family, otherwise you'd consider trying them; and (2) you want to use a dual with the same pinout so that you don't have to adjust the strip board layout. If you are planning to use a socket for that IC, you can of course just try some other duals in there (what do you have? TL062/072/082? LF412? NE5532?) if they have the same pinout, and see how it goes.

The LM358 is not particularly fast, but it IS single-supply. If that circuit depends on that characteristic, your pickings will be slim. I haven't scrutinized the oscillator in the schematic yet so I can't say, but if it isn't oscillating all the way to the rails (GND and +9V) then another dual may serve just as well.

In this discussion,
https://tagboardeffects.blogspot.com/2019/09/keeley-magnetic-echo.html,
it seems that others have gotten it to work using TL072 and TL082. The TL072 (and TL082, I think) is known to have problems if the input is driven too close to the negative rail (GND in this schematic), so I would guess that if TL072 and TL082 work in this circuit the specification of LM358 is not because it is single-supply, but because it is cheap and good enough.


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 Post subject: Re: LM358 substitute
PostPosted: Thu Apr 06, 2023 12:13 pm 
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WMP1 wrote:
If you are planning to use a socket for that IC, you can of course just try some other duals in there (what do you have? TL062/072/082? LF412? NE5532?) if they have the same pinout, and see how it goes.

^ This. I'll bet a JRC4558D or RP4558P would work, as well.

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 Post subject: Re: LM358 substitute
PostPosted: Thu Apr 06, 2023 1:06 pm 
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That particular LFO is the same as the Phase90. Normally, I'd recommend sticking with the LM358 or TL022 for most LFO op amps. You can use almost any op amp, but I find these to be the most stable. Anyhow...The Phase90 used 741 op amps. So you can use pretty much anything here.

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 Post subject: Re: LM358 substitute
PostPosted: Thu Apr 06, 2023 1:53 pm 
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Joined: Thu Feb 04, 2010 11:25 am
Posts: 191
Location: Michigan
Great, thanks guys.

Update: built the delay and tried about 8 different opamps in the LFO, and they all seem to work equally well as you guys expected.


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