Boss CE2 Trim

[nickbungus]

Hi

I have built a Boss CE2 using the tonepad layout only to realise I dont have a 10k trimmer.  I do have a 20k timmer.  Was wondering if I could sub it?

Its in the power section to bias the 4.5v (VR3)

[ElectricDruid]

Yes, you could sub it.

It'll be a bit more sensitive than the 10K trimmer, so you'll have to be more careful when tweaking, but it ought to work.

It will also affect the impedance of the bias voltage a bit (15K/15K vs 10K/10K) but I doubt that's significant.

It's not ideal, but it'll work in a pinch.

HTH,
Tom

[nickbungus]

Thanks Tom as always.   I got itchy fingers while waiting for a response and put it.  I've got signal but no effect,  so it's debug time

[thermionix]

You could tack on a 20K (22K) resistor in parallel.

[GGBB]

Could also jumper the two 4k7s R27 R28 so that your voltage divider stays close to original 10k/10k.

[antonis]

It will also affect the impedance of the bias voltage a bit (15K/15K vs 10K/10K) but I doubt that's significant.

C18 will take care of it.. 
(although you're right about insignificant ratio raise, Tom..)

Could also jumper the two 4k7s R27 R28 so that your voltage divider stays close to original 10k/10k.

It will call for a multiturn (X10 plus) trimmer and flexibly steady hand, also..
(we may like to believe we live in an analog world but our motor neurons impulses are sent in digital form..)

[Fender3D]

'Cause we are living in analogical world
And I am a digital girl
You know that we are living in analogical world
And I am a digital girl