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  1. WHONOES

    Help needed with portable car battery charger

    If it charges ok, why not just switch it off at the wall socket or unplug it.
  2. WHONOES

    Current design of amplifier VAS

    Depends on whether you are planning to use bjt's or fets for the output stage.
  3. WHONOES

    A system for Charging two separate batteries alternately

    I'm sure that what you are asking for is possible but will require a bit of thought. How do harvest the energy from your piezo devices?
  4. WHONOES

    Oscilloscope Connection Question

    For safety's sake, I would go the isolating transformer route. I doesn't have to be big, 1VA type would be adequate, but what ever you have around (if any) would suffice.
  5. WHONOES

    Automatic transmission component

    Perhaps a current monitor?
  6. WHONOES

    Automatic transmission component

    Was there anything attached to or passed through the ring (Other than a fixing screw)?
  7. WHONOES

    Op amp comparator troubles

    Presumably your brake lights are initiated by a switch connected to your brake pedal. Or is it not?
  8. WHONOES

    Op amp comparator troubles

    As your sim worked whilst using an NPN bjt, why not use that in your circuit. Much simpler.
  9. WHONOES

    Increase the amperage fo PNP transistor

    What is actually happening to your motor. Does it never start, never turn off something in between or none of these?
  10. WHONOES

    Convert 1 phase to 3 phase by using an old washing machine

    You could try and old car alternator. These are 3 phase devices with a built in rectifier. You could strip out the rectifier which would then give you 3 phase ac The output of these alternators is controlled by injecting a current into the rotor with the voltage level being dependent on the...
  11. WHONOES

    How do i repair a noise sayonapps 1192bt subwoofer?

    What sort of noise does your system make?
  12. WHONOES

    Input Zener

    Why do you have a choke in the supply line?
  13. WHONOES

    How difficult to have a microphone made

    You could try a Unidirectional microphone. They are designed to have a narrow acceptance angle so that the majority of the signal comes from straight ahead with very little coming from the periphery. Some form of amplification may be required but would be quite straightforward.
  14. WHONOES

    Custom Dog underground shock collar

    NO, No No, No. If you don't know how to train your dog without using barbaric methods then find a trainer who does. Look up Graeme Paul who has a series on British TV called "Dogs behaving badly". The program deals with owners who don't know how to control their dogs.
  15. WHONOES

    Transformer voltage output higher than expected

    Transformer secondary voltages are specified at maximum rated load. As the load decreases so the voltage will increase. This aspect will be referred to in the Tx spec as its regulation factor as a percentage. For a small transformer regulation can be 20% or more whilst for a large transformer it...
  16. WHONOES

    Help with work to finish my college. Help me please!

    It is a class AB and there is a lot wrong with the circuit as presented. 1) the output end of C1 is connected to ground and should be going to the base of Q1. 2) Dispense with R1 and C2. 3) The junction of Q1 and R3 is connected to the positive supply. Remove this connection. 4) The base of...
  17. WHONOES

    Help with work to finish my college. Help me please!

    How about a schematic of your circuit for us?
  18. WHONOES

    MOSFET problem

    You need to check source to drain with the gate connected to the source. Leaving the gate unconnected whilst testing will give erroneous results.
  19. WHONOES

    Ebike motor controller

    You should hunt out a Logic level Fet. They are designed to be fully enhanced at a lower voltage e.g. an IRL530 is fully enhanced at 7V. This is only an example and not a recommendation.
  20. WHONOES

    12v to 24v absolute beginner

    As other contributors have suggested, an invertor that gives you mains voltage with your wheelchair charger plugged into it would be the preferable option. Unless you know precisely what you are doing when charging lipo batteries then leave well alone, If they are not subject to a proper charge...
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