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  1. AFex54

    frequency range too small on 555 timer circuit?

    yeah it is, I guess the rotary switch with caps is my easiest option
  2. AFex54

    frequency range too small on 555 timer circuit?

    around 0.2 Hz to 2 Hz with duty cycle from around 10% to 90%
  3. AFex54

    frequency range too small on 555 timer circuit?

    adjusting C1 helped me get into my desired frequency band but had no effect on the width of the band, I would need a variable capacitor, maybe 555 timers are designed more for setting to specific freqeucny and leaving it there? I suppose a variation of caps on a rotary switch would achieve this...
  4. AFex54

    frequency range too small on 555 timer circuit?

    http://www.electroschematics.com/5834/pulse-generator-with-555/ I breadboarded this 555 pulse generator and the duty cycle adjustment is very good however i cant get the frequency range I would like, it is very limited to the point of only noticing a change in frequency at either extreme of the...
  5. AFex54

    will a basic buffer be sufficient?

    sorry by 'buffer the gate' i meant buffer 9V after it has ran through a series of wires and bus bars to remove impedance, I call it a gate because it is gating an envelope generator. this is a similar design to mine , everything after the buffer you can ignore: :
  6. AFex54

    will a basic buffer be sufficient?

    So I need to buffer the gate and CV signals from my CV keyboard, what kind of circuit would you recommend? its a fairly lofi device but i still want to make it work as best as possible, I suspect the diagram below is the ideal buffer? would it need a few more components to tailor it for my...
  7. AFex54

    sample and hold pulse source?

    That would work perfectly, thanks for the tip :)
  8. AFex54

    sample and hold pulse source?

    I would like to be able to sample and hold white noise for random voltages but I need a very short pulse for this. I need a 50µs or less pulse with a general frequency range from about 50ms to 3 seconds, Unless a 555 can operate at these extreme Im not sure how else to achieve this, help is...
  9. AFex54

    Does clock pulsewidth affect the 4017 ?

    I should have left the original post there when I edited it, you needed it to understand what I was asking. the word 'affect' is very misleading without the OP I was wondering if I could adjust the length of each steps 'gate' to be lower than 100% of the step with a narrower pulse, sorry for the...
  10. AFex54

    Does clock pulsewidth affect the 4017 ?

    edit: think I figured it out , the gate is a constant signal that is switched between steps with each pulse, so to answer my own question the length of the pulse has no effect.
  11. AFex54

    When should you buffer a signal?

    now i understand thanks :)
  12. AFex54

    When should you buffer a signal?

    sorry only seeing your reply now, Would that not remove the specific impedance of the potentiometer/resistor for each key aswell?
  13. AFex54

    When should you buffer a signal?

    The 'Bus buffer' in the CV Keyboard diagram is making me think I need one
  14. AFex54

    When should you buffer a signal?

    Hi , Im building a simple CV keyboard for a synthesizer, This is the idea but my design is different: http://www.musicfromouterspace.com/analogsynth_new/SINGLEBUSSKEYBOARD2007/kbbus.gif the string of resistors in the image will be a bare 300mmx2mm copper wire busbar connected to a 9V 2.5A...
  15. AFex54

    When should you buffer a signal?

    I dont know where or when my signals need current buffering, I feel buffering randomly could cause a circuit to malfunction, but I do know I need it. Is someone more knowledgeable could shed some light on this that would be great!
  16. AFex54

    Converting Hi pass to Lo pass

    Anyone?
  17. AFex54

    Converting Hi pass to Lo pass

    I would like to make high pass clone of this simple low pass filter, After a bit of research I think I need to invert the filter and feedback components to do this, C9 and C10 become R35s and R35 becomes C9/C10? Heres some info and the schematic (VCF in bottom left) : It is a low pass "T" type...
  18. AFex54

    would it be possible to run this circuit with a single 9V supply?

    ok cool, and yeah I agree, Music from Outer Space projects are an absolute dream to work on.
  19. AFex54

    Ideas for simple pulse circuit?

    cheers guys :) pretty awesome a simple 8 pin IC can provide exactly what i need.
  20. AFex54

    Ideas for simple pulse circuit?

    Need some ideas for generating a repeating slow pulse from 0v- 9v lasting around 250ms with pulsewidth adjustment. A square LFO of sorts. any help/input would be appreciated as im fairly new
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