latest hairbrain idea #1

[pinkjimiphoton]

i was kinda thinking it may be cool to make a jig, or even a daughterboard so you can swap between ic's.

it LOOKS to me like you could easily swap, say, a 741 for a 071 with a tpdt stompswitch, by switching the input/output, but i'm curious if it would be better to
1: switch the b+ in and out between the two chips
or
2: leave the b+ connected, and just switch the ground between the chips to power them off and on.

it seems to me both methods would work, tho i'd imagine switching the ground would be easier with less noise or "popping".

i haven't even messed with it yet, which is why its a hairbrain idea <usually, these work out in some tarnation or other, and yes, i know i swapped incarnation for the wrong word>

so if it works, why? well, you could try two different chips out to see if tonal diffs really DO exist or if its a figment of our collective hallucinations like i expect it to largely be... or use it as a snippet so you could use two very different sounding chips in one device, or maybe add a "stacked" ic on one side, whatever...

but here's where the rubber hits the road and the shite hits the proverbial fan...

how the hell could ya do this with a DUAL ic?

some probably remember my love affair with the 1458 in distortion boxes. crappy chip to some, but i love the way it reacts under distortion. apparently jim marshall agreed with me on that, as it's the chip that gives most of the solid state 800 series their voice... but in some cases, a tl0x2 may sound "better"... and i'd love to be able to swap between them, for a fuzzier sound one way, and a "tubeier" sound the other.

so by my reckoning as a breadboard toting monkey with opposable thumbs,  to do a dual opamp, it would mean switching 6 pins with one switch... so a 6pdt would work, if one was made which i believe isn't.
shit, my english is failing... lol

so my question... maybe use a hex inverter as a switch somehow or something similar? sorry for the dumb questions, but i'm totally playing with stuff way above my simple fuzzmonger paygrade.

if ya wanted to do this, what would be a good way to start?

curiosity killed the cat, hopefully it don't kill the pinkster too

thanks guys. i'm all verklempt, so ....

[vigilante397]

So here's a thought, why not treat the dual opamp as two single opamps and switch the stages separately? It would be interesting to see what a circuit sounded like with one half a 1458 and one half a TL072.

[kraal]

So here's a thought, why not treat the dual opamp as two single opamps and switch the stages separately? It would be interesting to see what a circuit sounded like with one half a 1458 and one half a TL072.

Wouldn't leaving half a TL072 floating lead to unpredictable behavior [1] ?
Using a 6PDT is possible but costly [2], especially if you have many ICs.
It could be interesting as a testing tool, but one would probably also have to deal with the impact on the power supply additional IC could have.

[1] https://www.ti.com/lit/an/sboa204a/sboa204a.pdf
[2] https://www.mouser.ch/ProductDetail/Nidec-Copal/ET610N13-Z?qs=sGAEpiMZZMtFyPk3yBMYYJQMYdIqGZzQJeN4h7eYntk%3D

[duck_arse]

too much overthinking - an opamp - one input, one output, that's all you'd need to switch per stage.

[pinkjimiphoton]

too much overthinking - an opamp - one input, one output, that's all you'd need to switch per stage.

d.a., you're my hero <3

yeah, i was thinking testing, in circuit, whatever. some chips actually do seem to sound a bit different, and was thinking it would be kinda cool to swap them in a circuit, and especially for testing,
i mean, once ya get a certain amount of what i call fuzz narcosis, well... "hey! this new fuzz sounds exactly like that OLD fuzz!!!"and its a rabbit hole trying to see what "sounds best". flipping a switch is easier than powering down <hahahah if i remember to> and unplugging/plugging a new chip.

my ears get forgetful quick i think.

so... to do a dual opamp chip, you could switch just the in's and outs on each side with one relatively available these days 4pdt?

cuz that would be cool, beavis

[willienillie]

Hare.  A rabbit.  Harebrain(ed).  Much like birdbrain.

But don't tell the Bunny.  Or the Duck.

[aron]

It might not sound all that different; depends on the circuit. But the MOSFET op amp I tried long ago definitely did sound radically different when distorted.
I just put in the RC4558 and call it a day. hahahaha

[Marcos - Munky]

I just put in the RC4558 and call it a day. hahahaha

I do the same. And almost all the time I use some suspect ones I got from aliexpress but know they're working.

[pinkjimiphoton]

It might not sound all that different; depends on the circuit. But the MOSFET op amp I tried long ago definitely did sound radically different when distorted.
I just put in the RC4558 and call it a day. hahahaha

yeah, for the most part a dual opamp is a dual opamp. but to my ear, a 1458 and a tl0x2 are definitely noticeable the way they distort. the tl's are a softer clip til they hard clip, the 1458's clip a lot harder and faster.

4558's to me all sound pretty much identical