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  1. Arouse1973

    Voltage controlled thru opamp playing up?

    If there was a software fault why would it work by increasing the frequency? Any ideas? Adam
  2. Arouse1973

    Voltage controlled thru opamp playing up?

    Nice one Kris. I don't quite understand his set up can you explain? So what is he doing, is he outputting PWM into the filter and then this is creating an approx d.c voltage of 1-5V depending on the duty cycle? Can you tell me from his code what the timings are. Cheers Adam
  3. Arouse1973

    Electric motor

    With some additional circuitry like a rectifier and voltage regulator. Adam
  4. Arouse1973

    Astable multivibrator calculations and Multisim

    Can you post the schematic? Adam
  5. Arouse1973

    D-flipflop freq divider

    I am no digital guy by far, it brings me out in a rash :) But I think Kris is right, the circuit shown has feedback from the output, is this right? Adam
  6. Arouse1973

    First post, should be a simple question!

    Ok just split the circuit and add another op-amp. Adam
  7. Arouse1973

    Voltage controlled thru opamp playing up?

    Try to connect a 1V d.c input directly to the opamp from a PSU and vary the voltage up and down a bit and see what happens. Remember to disconnect the filter at the front end to stop your main input from effecting anything. Then put a 56K resistor inline and do the same, tell us what it does. Adam
  8. Arouse1973

    NiMH solar battery charger

    Good Kris Adam
  9. Arouse1973

    laser ablation of PCB resist

    Wow cool Steve :) Adam
  10. Arouse1973

    capacitor polarity in a phono stage project

    Electrolytic capacitor as you know have to be connected the correct way. They normally have a printed white or grey stripe on one side although SMD devices have a black bar it's the same thing. This stripe connect to the lower voltage. Another give away is for a new capacitor there will be one...
  11. Arouse1973

    NiMH solar battery charger

    Ok but make sure your battery can handle 1C. Also delta peak detection can be a bit tricky to get right, sometimes it will trigger too early and sometimes not at all. I would still have current limit just in case. A good old run of the mill resistor will do the job and because it is passive will...
  12. Arouse1973

    A new type of BLDC motor drive?

    Yes go on Steve, give us all a break from this looser.
  13. Arouse1973

    First post, should be a simple question!

    Here you go, just done something that might work. Make R1 and R3 adjustable. R1 is your low end adjustment and R3 is your top end adjustment. Now you can have anywhere from 30Hz to 30Khz. Adam
  14. Arouse1973

    First post, should be a simple question!

    Could you consider a band pass filter. This is basically a low and high joined together. Adam
  15. Arouse1973

    SMD Identification

    Looks like their MEDCAN or SMALLCAN. It might be a special because I can only find that package in the directFET range. Adam
  16. Arouse1973

    SMD Identification

    Metal can MOSFETs. That's what they are. Steve your right and the big square things are most likely 0.36uH inductors Adam
  17. Arouse1973

    NiMH solar battery charger

    You are lucky you didn't try this with a power supply first. You don't have any current limit for the battery, you could have damaged the battery. I suppose the only saving grace would have been the rds on of the FETs but just having looked at the data sheet they are 30A rated and 40mOhm rds on...
  18. Arouse1973

    Hi all, interference?

    You have two types of fields associated with interference and that is the electric field and the magnetic field. They combine at a certain distance away from the source to produce an EM wave. These two distances are called near field and far field. If you are within 1 wavelength of the source...
  19. Arouse1973

    Hi all, interference?

    Screend cables only work well in the far field which is normally e-field which are produced by switching circuits in automotive systems and also many other bit of equipment. As duke said if its getting in on the input you have to filter it out. Adam
  20. Arouse1973

    GUYS HELP!!! WE NEED FOR OUR REMOVAL!!! T.T

    You can't work out zin without knowing the input frequecy. Z gives it away a bit its a.c resistance basically.
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