Input/Output path?

[craigslee]

Hi amp guru's!,

I need some straightforward advice regarding a circuit I've hopefully attached.

I'm introducing a post overdrive tone circuit to my amp's overdrive signal. I have cut the pre master amps' PCB circuit path and need to confirm exactly where I introduce the input signal from my amp to the new circuit, and additionally where I output it.

I'm a little stumped because the diagram indicates what appears to me to be two possible input paths from the 13k Zsrc (one input path pre all three 100k pots (bass treble & mid) and another past the mid pot direct to R5.

Then the signal appears to be output from a point between both R4 & R5?

Is this correct?

Thanks in advance.

[Andy Le Blanc]

Assume "A" in and "C" out.

I see what you mean, all the representations in the TSC are like that.

never thought of it, would make you jumpy if your not used to reading schematics.

[craigslee]

Thanks Andy, you've been most helpful.

So.. would that make B path to ground?

Cheers.

[ChrisM]

B is like a common reference point.

[Cliff Schecht]

A is input, B is ground, C is output.

[craigslee]

...meaning it's a path to ground or not necessary?

Excuse my ignorance.

Thanks.

[Cliff Schecht]

Yup, the mid pot gets the same ground at the bottom lug as the mid and treble pots do. The little ground symbol at the bottom of the treb and mid pots is just missing from the mid pot.

[Structo]

Ground=common.

Over the years the terms and symbols have changed a bit but after a while you will pick up on the differences.

Kind of like another language really, just need to practice it.

[Cliff Schecht]

I love how in old text, condensers = capacitors. I think the term condenser is more descriptive term when you consider that a cap is literally "condensing" the energy inside an electric field. I guess the term capacitor comes from the fact that different caps have a different "capacity" for how much energy they can store.. Complete guess though, I'll have to read up on this later.

[craigslee]

Well done guys. You've proved extremely helpful.

Thanks again!!