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  1. AFex54

    sample and hold pulse source?

    still using the 555 but I dont have to. could you name an alternative edge triggered monostable?
  2. AFex54

    will a basic buffer be sufficient?

    thanks a lot and good night!
  3. AFex54

    will a basic buffer be sufficient?

    heres a diagram of how mine are wired, hope it helps: http://postimg.org/image/n3w1j5f0d/ edit: and of course I made a mistake... it should be R2 not R1
  4. AFex54

    will a basic buffer be sufficient?

    100k,
  5. AFex54

    will a basic buffer be sufficient?

    and using potentiometers instead of resistors wouldnt be problem? I just assume you used the resistors conform to a more traditional musical keyboard. my keyboard is rather unconventional, its more like a hybrid between a keyboard and an analog sequencer
  6. AFex54

    will a basic buffer be sufficient?

    right well that was a load of fuss over nothing haha. I made a thread a few weeks ago for advice before I built the keyboard and they recommended a buffer at the output bus of the pots so it stuck with me
  7. AFex54

    sample and hold pulse source?

    hey I just tried this idea there and im having a problem, the long delay pulse is retriggering the short monostable pulse as soon as it ends until the the astable goes low again which just defeats the purpose. im curious if you had any idea how to fix this problem? also im actually triggering a...
  8. AFex54

    will a basic buffer be sufficient?

    yeah exactly,
  9. AFex54

    will a basic buffer be sufficient?

    I dont know what circuit you mean? the noise toaster schematic has everything , its just 30 or so duplications of the frequency control pot**. one for each keyboard key, you select the pot with a keypress which closes a switch underneath sending 9V through it. the more I read about this the...
  10. AFex54

    will a basic buffer be sufficient?

    yeah sorry, I felt giving a pile of info would yeah sorry, I will know for again, I thought the solution would be as simple as ''you need a unity gain buffer''. felt a wealth of info would be bit rude but now i know it only makes your job easier.
  11. AFex54

    will a basic buffer be sufficient?

    this one the im talking about:http://www.muzique.com/images/buff7.gif edit: oh sorry that was very stupid of me... dont know how i managed to find the same circuit 3 times and still think it was a different one.
  12. AFex54

    will a basic buffer be sufficient?

    I tried out the unity gain buffer I posted above but Im getting strange readout from my voltameter, 0 resistance gives me +3.5V, 50k gives me +7.5V and 100k brings me back to +3.5V? probably due to ground(BN) being tied to the other side of the pot.
  13. AFex54

    dual opamp, only need 1?

    the circuit only needs one op amp, I have lots of TL082s and im wondering what I should do with the unused op amp? leave it be? or something else? thanks
  14. AFex54

    will a basic buffer be sufficient?

    highest and lowest input voltage? 9V highest ofcourse but im not sure what the lowest would be. I feel this is turning out to be much more complicated than it should be and its my fault heres is the schematic of the device i hope to control...
  15. AFex54

    will a basic buffer be sufficient?

    9V through a 100k potentiometer
  16. AFex54

    will a basic buffer be sufficient?

    sorry, my design is different to that, that diagram just gives a nice visual explanation of what a CV keyboard is but otherwise its confusing and over complicated, basically the device im controlling with my keyboard is voltage controlled. each key is connected to 9V and each has a potentimeter...
  17. AFex54

    will a basic buffer be sufficient?

    ok thanks, also im using a virtual ground,any idea where I should connect it? edit: to the non-inverting input via a resistor , the resistor determines the input impedance. I will use a 1M resistor but im wondering if using an even higher value would have an effect other than further lowering...
  18. AFex54

    will a basic buffer be sufficient?

    sorry, this is the very last thing I need to do before I can start wiring my panel so im a little impatient, and unfortunately I cant really test this on a breadboard so i need external advice to continue
  19. AFex54

    will a basic buffer be sufficient?

    still need help with this, http://www.muzique.com/images/buff7.gif would that do it? are the filter caps important? I wouldnt need them since im only buffering a CV and not an audio signal right?
  20. AFex54

    frequency range too small on 555 timer circuit?

    I'd like to add that the width would be fine as just a SPDT switch for 10-20% (typical synthesizer trigger) and 50-60% (typical synthesizer gate) doubt that makes its any easier though
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