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  1. Arouse1973

    How to block or filter out back EMF interference?

    This is something you could try. This should reduce the noise considerably. Twisting the power wires together is also recommended for common mode noise which is probably what you have. Adam
  2. Arouse1973

    How to block or filter out back EMF interference?

    If you have connected the capacitors correctly one from + to metal case and one from - to metal case and the problem is still present then it sounds like it might be a conducted emissions problem also. Some of the noise from the motor is going to prefer to go down the wires and radiate out from...
  3. Arouse1973

    Help with Arduino error: protocol error, programmer is out of sync

    I am not sure what model of Arduino you are using but two things I have found recently is fake FTDI chips from non genuine Arduino suppliers. Also on the Arduino Nano there is a hardware fault, the test pin for the FTDI chip is left floating and should be connected to 0V (GND). I shorted pins 25...
  4. Arouse1973

    Capacitors in parallel effects on frequency

    Try 159 MOhm and not 159 KOhm. But as you can see both are passing this frequency without any attenuation. Adam
  5. Arouse1973

    Capacitors in parallel effects on frequency

    You Said "Why do you need a resistor to have a defined cutoff? If you lower the capacitance the reactance increases versus that original 100hz. If the reactance is high enough versus a given frequency wouldn't the ohms inherent in that reactance be enough to outright block the frequency?"...
  6. Arouse1973

    Small Microphone transmitter

    Ok I got it Oscillating with a PNP if anyone's interested. But had to change quite a bit. the values I used for components are the ones I had lying around so might not be optimum. Adam Circuit Diagram Circuit Layout Pickup Coil Oscilloscope Output
  7. Arouse1973

    How do energy plants safely measure power

    Hello Gigantic multi-meter, Yes sort of. I think most of them these days would be using computers and advanced software to maintain the plant at it's optimum efficiency. Here is a picture of a Nuclear power plant control room. But I prefer the second picture :) Adam
  8. Arouse1973

    Capacitors in parallel effects on frequency

    Let me clarify, it's not just the capacitor that determines this as Hop (Hevans1944) mentioned above, it's the resistance also that needs to be included. To have a defined cut-off you would normally have a resistor also in the circuit. The cut-off frequency, because I can be bothered is...
  9. Arouse1973

    FM modulator light only and no transmitting

    The white wire is apparently the antenna :) Adam
  10. Arouse1973

    Capacitors in parallel effects on frequency

    I don't know if the question about the splitting of current had been answered. But if you have say two capacitors (ideal) one valued at 100 uF and the other at 10 uF connected in parallel and a 1 Volt 1 KHz sine wave is applied across them .The circuit current is split between the two at a...
  11. Arouse1973

    Component Identification

    I did, it's under inductor colour codes, or did you want something specific or mean something different?
  12. Arouse1973

    FM modulator light only and no transmitting

    The white wire might be a control line for voltage regulation or over current, it looks like it's connected to the base. Adam
  13. Arouse1973

    Sensor ideas

    Just found something similar to what I suggested but it uses the arm muscles, not sure how it works! http://www.popsci.com/gadgets/article/2013-02/gesture-control-all-your-gadgets-awesome-wristband Adam
  14. Arouse1973

    Sensor ideas

    What about sensing the tendons in the wrist with a Bimorph sensor or piezo disc? Thanks Adam
  15. Arouse1973

    Small Microphone transmitter

    The first circuit does not oscillate. I think they may have been relying on the capacitance between the windings off the coil which is why a parallel capacitor had been omitted initially. I have tried it with a capacitor across the coil and with a capacitor from supply to base and a resistor...
  16. Arouse1973

    Hello

    Hello Aexp Adam
  17. Arouse1973

    Following the sun ( no programming )?

    Hi Here is an interesting DIY sun tracker. http://www.electroschematics.com/8019/diy-solar-tracker-system/ Thanks Adam
  18. Arouse1973

    Getting into the industry

    Good luck and I hope it goes well. Adam
  19. Arouse1973

    Help Identifying Component

    Hi Matt Could it be a resistor using the old RMA colour scheme where the body colour is part of the value? Adam
  20. Arouse1973

    Members location

    Yes I agree it can be annoying. Adam
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