BYOC Brown face harmonic tremolo - 12V?

[patricks]

Howdy all!

I'm planning on using part of the BYOC Brown face harmonic trem as a building block in a circuit I'm working on at the moment, the schematic is here, and the part I'm most interested in is the high and low band gain stages around Q2 and Q3.

Would it be okay to simply supply it with 12V, or should I change the resistor values?

Thanks heaps
Pat

[antonis]

Q2 & Q3 Collectors should be biased at a higher level (about +25%) but as long as both are biased at the same level, it shouldn't be a problem..   

[patricks]

Brilliant, thank you 🙂
Would the simplest way to do that be to decrease the value of R8 and R9 a bit?

[antonis]

Nahhh..
(never count on h_FE for bias..)

edit: I didn't say above you MUST bias them higher..!!
(they WILL be biased higher due to higher supply voltage..)

[patricks]

Ah, I thought so - my first step was just going to be to connect them to 12V when setting the circuit up on the breadboard and see how it goes

[antonis]

Go for it..!!