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  1. Arouse1973

    DC or AC Voltage reduction and relay help

    Found a cheap DVM supplied by one of my suppliers. Looks just like yours. I found that if you put a DC voltage onto the probes when the meter is set to AC. You get twice the voltage. Opened it up and well quite complex, it consists of 1 diode, 1 capacitor and about 6 resistors and a black blob...
  2. Arouse1973

    DC or AC Voltage reduction and relay help

    Oh one other thing I thought I would just mention, but the blind unit probably has one. Is a flyback voltage protection diode across the coil. I noticed that the control4 says it can drive blinds so they may have thought of that also. Adam
  3. Arouse1973

    DC or AC Voltage reduction and relay help

    I don't think so as long as the contacts power rating in this instant is higher that the volts x current you are switching. Adam
  4. Arouse1973

    DC or AC Voltage reduction and relay help

    If the blind winder coils is rated at 24 Volts and the control gear can only switch say 18 Volts then you can't connect them. Now this voltage is rated at 2 Amps and I would be surprised if the blind control relay would draw that much current. So its telling you the power rating of the contacts...
  5. Arouse1973

    DC or AC Voltage reduction and relay help

    Ah I just thought it is most probably DC. The meter is not a true RMS meter so it might be assuming there is a -30V portion also and computing that as twice the voltage which is why you get 60 Volts or so. Sorry should have noticed that before. Adam
  6. Arouse1973

    DC or AC Voltage reduction and relay help

    AC relays have a shader ring on the top of the coil it might look like a square piece of metal with a hole in it. Can you see anything on the side of the relay? What about the model of blind controller, do you have any details for that? Adam
  7. Arouse1973

    DC or AC Voltage reduction and relay help

    Yes you can get A.C relays. Does the relay have any markings on it to give a clue, maybe we can Google it.
  8. Arouse1973

    DC or AC Voltage reduction and relay help

    What Control4 system do you have? Can you link to the device? Adam
  9. Arouse1973

    DC or AC Voltage reduction and relay help

    Hi Simon I am confused as to why you have a D.C and A.C measurement. Adam
  10. Arouse1973

    Batteries in parallel for higher mAh

    I could also tell you I have had one explode behind me when some one connected a 7.2V battery to a 3.6V battery. Ripped a hole in his shirt. They were non rechargeable which I know is different but goes to show how dangerous they are. Adam
  11. Arouse1973

    Batteries in parallel for higher mAh

    Yes absolutely correct, DO NOT DO THIS. Adam
  12. Arouse1973

    DC or AC Voltage reduction and relay help

    Hello Where are you measuring the voltage, can you show us a picture of that? You are also measuring current, where are you measuring that also? If you use the NC terminal of the control relay then when the control gear is not powering the relay the blinds will go up, is this correct? I guess...
  13. Arouse1973

    Drive 12V 15A load with PWM 18V-48V 2A

    I think your best option is to have a separate driver which can be controlled via PWM. This could be as simple as a MOSFET which is driven by your PWM signal. You may need to reduce the output voltage of the PWM so it's doesn't damage the gate of the MOSFET as you say it's lowest voltage is 18...
  14. Arouse1973

    Sound Frequency-based power switch

    Yes the tone decoder I mentioned should achieve less than 1Hz resolution with no problems, the data sheet states it has 0% to 14% bandwidth, don't know about 0% :) but they are quite good. We used to use these for carrier wave detection at 27 KHz, once calibrated, even over reasonable temp...
  15. Arouse1973

    Sound Frequency-based power switch

    no probs :)
  16. Arouse1973

    Panasonic Home Cinema... No Power UP

    I live in Cornwall, would cost me 50 quid in Petrol just to get there :)
  17. Arouse1973

    Voltage help

    Probably not a good idea. You need to drop the voltage. What motor is it, how much current does it draw? Adam
  18. Arouse1973

    Sound Frequency-based power switch

    Hello Frequency to voltage convertor and a couple of comparators would probably do the trick. You might need a small amplifier from the microphone so the signal is able to drive the IC. Then a dual comparator could be used to turn on the respected LEDs. Another option could be a tone decoder...
  19. Arouse1973

    Panasonic Home Cinema... No Power UP

    Buzz these guys an email they might be able to help? Or look at what Kris has recommended. http://products.pacparts.com/panasonic_c0daayh00001_ic_1102028936.php Adam
  20. Arouse1973

    Panasonic Home Cinema... No Power UP

    Nice one Kris Adam
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