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D.o.S. wrote:you're not my real dad
Corey Y wrote: Tone is in the dingus.
DRodriguez wrote:I haven't studied it, but it seems to me like a way to intentionally clip the opamp for dirt purposes
crochambeau wrote:DRodriguez wrote:I haven't studied it, but it seems to me like a way to intentionally clip the opamp for dirt purposes
That's my take as well.
Another possible reason is that all opamps are not equal in terms of how close to each rail they can push their outputs, and if an opamp can tickle the positive rail but shies away from the negative rail by about a volt then shifting the bias (which in terms of an opamp can be simply thought of as the zero point in relation to your AC signal) up will offer the widest window of linear operation.
When it comes to the Big Muff though, we benefit from some lopsidedness as it will introduce more second order harmonics by clipping one side of the signal more.
D.o.S. wrote:you're not my real dad
Corey Y wrote: Tone is in the dingus.
imJonWain wrote:I never looked at this circuit before, it's kinda neat. I like (what it looks like to me at least) the use of positive feedback in ic1b to create/add sustain.
eatyourguitar wrote:for a TL072 is the shape of the clipping. one side will start to get non-linear when you kiss it gently and the other side will hard clip immediately. the voltage difference between the clipping points and the rails is very symmetrical on a TL072 compared to a 741.
crochambeau wrote:This is interesting, sounds similar to the difference between clipping a BJT at saturation versus cut-off.
crochambeau wrote:In the build I'm working on I've planted a trim pot across the voltage divider node of both of the Va & Vb virtual ground references, so I can swing the wiper around and fine tune the positioning a little. If as a result something interesting comes up I shall surely share on this thread.
I'm also departing a little bit from the schematic in that I'm deploying some old laser diodes I have for the clipping section. The laser diodes are natively configured as a cascading pair of diodes, but their join point is case common on the part - so that leg is clipped free and everything wrapped in shrink to produce a single diode of about a 2.6 volt drop. This might make any data I share surrounding the 741 stage only applicable to the build at hand.
D.o.S. wrote:you're not my real dad
Corey Y wrote: Tone is in the dingus.
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