Delay on Comparator output

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Roff said:
Prprog, what do you think the maximum length of time should be between the pulses?
Click to expand...

Honestly, I don't know. If I said a second, would that help? Remember that when the piezo is hit hard there is no delay between the switches. Your question is about the delay when the piezo is hit softly. Right?

Thanks for you help.
 
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prprog said:
Honestly, I don't know. If I said a second, would that help? Remember that when the piezo is hit hard there is no delay between the switches. Your question is about the delay when the piezo is hit softly. Right?

Thanks for you help.
Click to expand...
Well, I thought you might know how slowly you can press the velocity-sensitive switch that you are presumably trying to replace. I have a circuit designed and simulated, and I will make it adjustable for you, but I still have to put limits on the adjustments.
 

Roff:

The slowest time could be a second.

Thanks,
 
OK. More details: You will need an op amp package in addition to the LM339. Would you prefer to use a common part like TL072, which needs both positive and negative power supplies, or would you rather be able to stick to a single supply, but use a more exotic rail-to-rail op amp such as LMC6482?
 

Can a LM324 OpAmp be used? If not a TL072 will be ok.

Thanks
 
I haven't forgotten. I just have a lot of irons in the fire. Expect a schematic soon.
 
Here is the circuit I designed and simulated. I don't know what the output amplitude of your piezo is, so mods may be required on the input.
I started another version that used an op amp for the integrator (ramp generator). It would probably be comparably complex if I were to finish it.
 

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PS You need to connect the unused control inputs on the CD4066 to GND or +8V.
 
Roff.

Thanks a lot. I will take a look. I am still a novice so I will probably come back with more questions.

Thanks,
 
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