http://www.electronickits.com/kit/complete/ampl/k100.pdf
This pre-amp tone control looks pretty easy to handle build wise.
In an application like Driving a Tube power amp Dyna ST70...with Stompboxes before it...
Any suggestions as to a good one or whether somehting like this might be cool for my needs are welcomed...!
That was in the link I threw up for the amp thread. I checked out the preamp too. Looked like it might make a nice companion for the 18w (5watts RMS into 8 ohms) mono amp.
http://www.electronickits.com/kit/complete/ampl/ck706.htm
http://www.electronickits.com/kit/complete/complete.htm
What threw me though, was the balance pot. Seems like it could be converted to a midrange or presence control. But would the pcb support that?
Hehehe.... I built a digitizer in the late 80s that used a TDA1524 for front-end filtering. It was modeled after somebody else’s design that used the same chip (does anybody remember an Apple //gs board from a company called MDIdeas called the DigitizerPro?). It's an interesting device.... I just wish you could get separate control for bass and treble on each side. Oh well...
It's a serious power hog, but it works. I think you're better off with building your own filters in the long run.
If you want an interesting effect, connect two LFOs to the bass and treble inputs. :D
You can also get wahish noises by connecting an inverting opamp stage between the bass and treble inputs. :D
The balance control is an extension of the volume input. I would just tie it to 1/2 of the control voltage supply and leave it although I guess you could use it as a pseudo mid control in a weird sort of way. One thing to think about would be to use different caps for the left and right channels and run them in parallel with a summing amp at the output. that would make the balance control useful for some additional tone control. :)
Take care,
-Peter
QuoteBut would the pcb support that?
Heh, heh - if you know what you're doing, and have a decent craft knife, most PCBs can support almost anything... :twisted:
The bass/treble turnover frequencies for that chip appear to be optimized for music reproduction (i.e., full band/orchestra recordings) and are fixed internally. You will note from the kit schematic that the controls simply provide a control voltage to the chip, which takes care of everything else.
Unlikely to be a useful chip for guitar because you can't revoice the tone stack at all.