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  1. WHONOES

    Control the dc motor 40A controller

    AS I said in #5, you don't need a separate speed control module. You can derive that directly from your Arduino with a large FET using the pwm you were planning to drive the module you bought. Much simpler.
  2. WHONOES

    Basic understanding of low pass filter

    I agree with the book recommendation (I have recommended it myself in other posts). Every aspiring engineer should have one.
  3. WHONOES

    Newly coiled motor burnt out

    It was only on a large compressor some 30 years ago and wasn't sophisticated and had no overload detection.
  4. WHONOES

    Circuit design

    How do you propose to initiate the timer?
  5. WHONOES

    What solid state components can switch composite video (AV)?

    If going the relay route, make sure they are suitable for RF. Not all are.
  6. WHONOES

    Newly coiled motor burnt out

    I had an issue with a 7.5HP 3phase motor many years ago that didn't want to run properly and got hot. I replaced the motor only for the new one to behave in the same manner. It turned out to be the contactor used to start / stop the motor. One set of contacts had burnt out so the motor was...
  7. WHONOES

    Yamaha Stereo transformer

    Bear in mind that the duty cycle for music can be quite low and volume manufacturers tend to rate their power supplies with this in mind.
  8. WHONOES

    Newly coiled motor burnt out

    I agree with Bluejets, I would have run it up with no load to make sure it was Ok. Is it 3 phase.
  9. WHONOES

    Control the dc motor 40A controller

    Yup, that would probably do it or a IRLB4030. If you have trouble with the totem pole driver then come back.
  10. WHONOES

    Peak detector for piezo drum pad

    You can't sample each channel at the same time, they are done serially therefore you may need to hold each one up for a long enough time for the processor to read it. On a 5V supply the 6001 will output to 5V minus the forward drop of the 1n4148 so about 4.3Volts or so. Yes you will need the...
  11. WHONOES

    Peak detector for piezo drum pad

    The circuit of post #36 will work. The only limitation is the maximum output voltage from the LM324 which is 2V below the power supply when looking into 10K. The MCP6001 will also work and without the output voltage swing limitations. If you use the MCP6001 it will most likely have a bit of an...
  12. WHONOES

    Control the dc motor 40A controller

    If you have PWM available from your Arduino, you don't really need the speed controller. Just connect a large MOSFET to the PWM output and program accordingly. You will probably need a totem pole driver circuit to successfully drive a large FET from your device. Sounds horrible but is dead simple.
  13. WHONOES

    Peak detector for piezo drum pad

    The MCP6001 should work and for 19 cents each from Digikey seem like a bargain. Having thought about it a bit more, you could use a single transistor to do the impedance conversion but you will lose about 0.6V of your amplitude which could be significant for you. If you find that you really do...
  14. WHONOES

    Best non-contact temperature sensor for metal?

    Try a platinum thermometer element. They generally come in a ceramic package. They are very predictable but will need a small amount of electronics to realise the control that you require. The 5 degrees of hysteresis you want would be easily achievable.
  15. WHONOES

    Peak detector for piezo drum pad

    BobK's suggestion of the MCP6001 should work. Make sure you get the PDIP version for ease of use. They are available from Mouser Elecrtonics. Failing that you could use my original suggestion of the CA3140 again the PDIP version. They are also available from Mouser as well as Newark Electronics
  16. WHONOES

    Peak detector for piezo drum pad

    The NE5532 will not work for as you state, you need the input for the Arduino to fall to 0V. The output of the 5532 will not go lower than about 2V. The 358 that you mention will not work either for the same reason. You need a single supply rail to rail opamp. Google the underlined term and see...
  17. WHONOES

    Peak detector for piezo drum pad

    See my attachment. It shows a very simple voltage follower / buffer that will present a low impedance to the Arduino input. The opamp shown is a Texas (Ti) part and is intended for low voltage use. It's output goes to within 100mV of 0V. V2 on the input is you Piezo element. D1 may not be...
  18. WHONOES

    Peak detector for piezo drum pad

    Reagards to loading the piezo with the Arduino input, a simple voltage follower opamp buffer may be all that is needed.
  19. WHONOES

    No output left channel phono stage of Sony preamp mod. TA-E90ES

    Your output condition could also be caused by Q111 being open circuit which would allow Q112 to pull the gate of Q115 down to the - rail turning it hard on. Must admit though that Kellys_Eye's suggestion is more likely, but it would be worth checking Q111 just in case and may stop you going on...
  20. WHONOES

    Peak detector for piezo drum pad

    Can you measure the amplitude of the piezo pulse?
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