Help removing the buffer from a TC Boost + Line Driver & Distortion

Started by stinkfeet, April 12, 2025, 07:28:48 PM

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stinkfeet

I'm working on making my own boards for a TC Boost + Line Driver & Distortion. I want to omit the bypass buffer circuit, and I was hoping someone could show me what I need to remove for it to work and sound the same.


ElectricDruid

Why do you want to remove it? It looks like a sensible buffer input stage with a decent input impedance, whereas the following stage isn't. I'd also guess that it provides some gain at the input to ensure there's a good signal level for the noise supressor circuit to work with.

It's hard to say whether it would sound the same without it since we don't have component values on the schematic. There might be some tone shaping done in that first stage, but we don't really know. That's also why me saying there's probably some gain is a guess - we can't see.

If you're serious about the project, re-draw the schematic in your program of choice and add all the component values. That'll reveal to you all the things you don't actually know about the circuit, and it'll also give you a solid platform to start making tweaks.

HTH

amptramp

It would not be difficult to make this into a true bypass circuit where the signal would bypass all the electronics, including the buffer.  If you have a long pedal chain, true bypass may be needed to ensure a minimum of distortion and bandwidth loss, so it is a legitimate concern.

stinkfeet

Yeah, I was hoping to make this a true bypass circuit so that I could make some more space on the board. I'm not too familiar with buffer circuits or MOSFETs, so I was hoping I could get some guidance. I'm working on making up a schematic in easyEDA right now.

stinkfeet



ElectricDruid


stinkfeet

He hasn't even finished the schematic yet, He said he got about that far with it, and then he just stopped. Maybe since it's been refreshed in his mind, he'll start working on it again.

stinkfeet

I still haven't figured out the buffer, but here's the schematic with values


stinkfeet

Got the buffer wired, but I'm still not certain on how to remove it


amptramp

Add a switch to disconnect the input from all of the circuitry and take it to another pole of the same switch connected to the output with all intervening circuitry bypassed.  This is the only way to take the booster entirely out of circuit.