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  1. darren adcock

    Piezo Control voltage source

    Am i reading this correctly that VI is either the inverting or non inverting inputs? If so it means I have to make sure I don't have any voltage that exceeds this? In terms of in circuit, i'm going to need to follow the op amp section to see if it get's amplified anymore and see where that...
  2. darren adcock

    Piezo Control voltage source

    Thanks Steve. This is where it becomes obvious i've not been doing my maths homework :( how do I work out what the value of RS should be. The circuit is powered by -12v/+12v.... at it's peak the sensor tends to reach around 15v. I'll follow your advice on RS/2 and placing either side of the...
  3. darren adcock

    Piezo Control voltage source

    do you mean like this?
  4. darren adcock

    Piezo Control voltage source

    Hey AG. On testing it, It seems it won't be pushed much past 15v. We will be using it to pick up vibrations from drawing. Where would the protection diodes go please? I tried to see on the tl072 where I might find it's input voltage tolerences but couldn't work it out if you don't mind telling...
  5. darren adcock

    Piezo Control voltage source

    Hey. Gonna use this circuit as part of a sound installation At Manchester's science fair. How do I credit the circuit? I would like to cite electronics point, as support and also to help direct people here, Is there anyway you would prefer this worded? It's an art thing so all the room for...
  6. darren adcock

    Piezo Control voltage source

    ahhhhhhhh. oooops
  7. darren adcock

    Piezo Control voltage source

    Which museum do you work for Steve? It's been a dream of mine to intern at a museum helping out with tech display needs
  8. darren adcock

    Piezo Control voltage source

    Everything here helped. i was getting odd readings off my meter, and couldn't understand the voltage fade down. Sometimes it ended up sitting in minus and wouldn't resolve itself. I Initially tried to make a variety of voltage amps, but couldn't get them to offer up the sensitivity i needed. I...
  9. darren adcock

    Piezo Control voltage source

    Thanks guys, I'll folow your leads and report back if needed.
  10. darren adcock

    Piezo Control voltage source

    Hi I tend to use piezo's quite alot. I would like to use them as control voltage sources for CV ins on my synth. I have been trying to work out how I make them more sensitive, does making them more sensitive mean getting them to give out a larger voltage range? or is the issue to modify the...
  11. darren adcock

    Line splitter.

    That's really helpful thanks AG. Loads of circuit space just opened up right there!
  12. darren adcock

    Line splitter.

    Thanks AG. I will make what you have said also. I was worried if I split the signal I'd get volume loss which is why I added the extra opamps. Adding them was also a bit of learning via repetition also. I feel like i'm at a stage in learning where raher than copying chematics or asking you...
  13. darren adcock

    Line splitter.

    So in terms of an audio splitter is what I have drawn above ok? I don't expect it to be perfect. My intention is to run through a bunch of op amp based utility circuits.
  14. darren adcock

    Line splitter.

    I'll keep this as an ac line splitter. So interms of audio when the signal gets split the volume decreases? Yes thinking about this I can see that isn't the case for DC. Keeping this seperate here ill stop it being so confusing (along with me still learning to use the correct termiology). I'll...
  15. darren adcock

    Line splitter.

    ok sorry. It's a bit late for me now. I will attempt to reword and be clearer tomorrow with your concerns in mind.
  16. darren adcock

    Signal mixer, voltage mixer.

    A control voltage would be a voltages taken from a keyboard/ribbon controller? a modulating signal would be a wave form out?
  17. darren adcock

    Signal mixer, voltage mixer.

    I'm not sure what the difference is?
  18. darren adcock

    Signal mixer, voltage mixer.

    I suspect it's faulty, it was a fiver from china, not that means that makes it crap. Just's always been a bit tempremental. I'll learn to use the farnell one tomorrow and look at the small digi one at a later date.
  19. darren adcock

    Line splitter.

    Ok great. Thanks.
  20. darren adcock

    Line splitter.

    My intention is that I would like it to have one input that can then be split into 3 outputs. All i need is attenuation on these outputs. I see, is it because I said "control voltages" you mentioned mixing? Ok, that would be too high an amplification as most of the cv inputs I will be using want...
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