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  1. WHONOES

    How to connect piezo speakers to an amplifier

    I think you are overthinking this. Piezo tweeters are capacitive. The datasheet for the one you have linked shows it as 0.13μf. Therefore its impedance at 17Khz is 72 ohms. Its maximum voltage is 15V rms which equates to 42,6V pk to pk. You don't need an amplifier with vanishingly small...
  2. WHONOES

    Monster ClarityHD model 1 ... active speaker system ISSUE ...

    Had a very quick look. I think the amps are bridged class D. No more insights at moment.
  3. WHONOES

    Analog frequency meter

    Have a look at the link below. It takes you to a datasheet for the LM331. The LM331 is a Voltage to Frequency / Frequency to Voltage converter. There is much info on the datasheet including application notes...
  4. WHONOES

    Small Project Advice

    I, like others, would advise, keep it simple with Red Roses, some quality chocolates and a bottle of wine.
  5. WHONOES

    I cant measure voltage on 100 picofarad capacitors on multimeter

    I Have an "Atlas LCR40" LCR tester. It fits in the palm of my hand. The test leads can be nulled out so that the reading you get is the reading you get. I have had it for many years and it has had a lot of use. Look it up.
  6. WHONOES

    Reducing Voltage Drop over distance

    HO gauge is 16.5mm between the rails.
  7. WHONOES

    High Voltage spike , disrupts Display functionality

    So, what conditions is your device subjected to in the field? Have you taken any measurements in your device whilst operating in the field?
  8. WHONOES

    Looking for a power supply recommendation

    I use a system of a Sealed Lead Acid battery with a charger connected to it whilst I am using it. Seems to work well. Don't know if it would work for you.
  9. WHONOES

    High Voltage spike , disrupts Display functionality

    What is your rational for testing in that manner.
  10. WHONOES

    High Voltage spike , disrupts Display functionality

    I suppose the first question is... where are the spikes coming from?
  11. WHONOES

    High Voltage spike , disrupts Display functionality

    You could try a large ferrite bead on the cable.
  12. WHONOES

    PLASMA CUTTER IGNITOR CIRCUIT

    For the most part I don't use a gate resistor as it can restrict the rise time. Just get the totem pole as close to the gate as you physically can. Because the gate source junction is quite capacitive, the input current to the gate is determined by the signal rise time and can be quite high. The...
  13. WHONOES

    PLASMA CUTTER IGNITOR CIRCUIT

    See attached BJT Totem Pole schematic.
  14. WHONOES

    PLASMA CUTTER IGNITOR CIRCUIT

    Yes you can drive your MOSFET with bipolar transistors, I do it all the time. But.. you have to consider the input capacitance of the chosen device and the expected driver rise time as this directly affect the current driven into the gate. Also, you would need some sort of clamp on the gate to...
  15. WHONOES

    Reducing Voltage Drop over distance

    You really do need to measure the maximum load in Amps presented by the trains at 12V. You will need to do it with all the trains that could be running at the same time. You can measure them one at a time pulling what ever load you expect. A cheap DMM would do the job. Then we can go from there.
  16. WHONOES

    Controlling an Actuator

    I have a circular saw that cuts metal as well as wood.
  17. WHONOES

    Reducing Voltage Drop over distance

    Should be able to calculate the volt drop from the wire's resistance. See link below for chart giving resistance per foot for various gauges. Then ohm's law comes into play. http://www.devicecraft.com/ApplicationNotes/WireResistanceTable.pdf
  18. WHONOES

    Reducing Voltage Drop over distance

    The best way to reduce the voltage drop is to use the thickest wire that you can something like 32/0.2 or 2 lengths of 16/0.2. As well as that, put in a second set of power supply wires from the same source halfway round you track layout. This would essentially be the same as the ring main in...
  19. WHONOES

    Need someone to look over my circuit

    See attached a chart that shows sound pressure levels versus perceived intensity. http://www.sengpielaudio.com/TableOfSoundPressureLevels.htm
  20. WHONOES

    Controlling an Actuator

    Assuming your blade motor is ac driven, you could use a current transformer on one of the power leads to the motor and rectify and smooth it to get a dc level that is proportional to speed. Then feed the result, suitably scaled, into an A-D port in your μP and use that to control the feed rate...
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