Boss FA1 with no tone controls, how?

[Dimitree]

hi everyone,
I have an almost completed FA1 pcb, I'd like to skip the Bass and Treble controls, and the Low Cut switch, and only keep the Volume control.
Are the tone controls neutral when they are at 50%? if so, bypassing them is as simple as putting a pair of 25K resistors where the pots are?
About the Low cut switch, should I just avoid mounting C2 and R4?
thank you

[antonis]

Et voila..



edit: Actually, C3 value should be the sum of C2+C3 (517μF) but, IMHO, 470μF should be OK also..

[GibsonGM]

I suggest you breadboard this to see if you like it without the low cut. It might be great - but you might also need to play with C3 and /or C10 to get a good tone...I know as a guitarist that I hate a 'high fidelity' boost - it punches the amp in all the wrong ways...

[bluelagoon]

Heres a schematic the way I like to do it, with the Baxandall tone stack subtracted.
With the added in T1 Trim pot it allows to adjust the gain of the second stage
I took out the Low cut switch which basically leaves it with the better setting of no cut and full bass
If you want permanent cut Bass just put back in the R4 470k
If you want the selector switch for both settings add back the original Boss low cut switch as per original schem.

[bluelagoon]

edit: Actually, C3 value should be the sum of C2+C3 (517μF) but, IMHO, 470μF should be OK also..

Antonis, You do mean 470nF Dont You?

[antonis]

Antonis, You do mean 470nF Dont You?

Yeaaappp ..

P.S.
C4 is superfluous..

[bluelagoon]

So they say about C4, But I think I read somewhere it was there just in case as a cover all bases unexpensive addition.

[duck_arse]

Antonis, You do mean 470nF Dont You?

Yeaaappp ..

P.S.
C4 is superfluous..

antonis, bluelagoon - C2 is 47uF non-polar. C3 is 47nF poly. what is the sum now, 47 microFarads or 470 microFarads?

[antonis]

No Sir..

C2 is 0.47 and C3 is .047 ..
(C3 is an order of magnitude lower than whatever C2 is..)

[duck_arse]

No Sir..

C2 is 0.47 and C3 is .047 ..
(C3 is an order of magnitude lower than whatever C2 is..)

is that a multiplier dot, or a speck of dust? Boss should be ashamed of that diagram.

[ElectricDruid]

This is why the "4K7" or "2n2" style of writing values was invented. Much more reliably read after repeated dodgy photocopying!

[antonis]

Boss should be ashamed of that diagram.

So, could you plz yell on Boss and not on me or bluelagoon..??

[PRR]

is that a multiplier dot, or a speck of dust? Boss should be ashamed of that diagram.

The other fly-specks are all smaller or larger than the C2 C3 fly-specks.

Also a trace of math leads to 22Hz and 230Hz as reasonable corners.