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  1. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    The diode make a circuit with the coil and the current just keep going round and round and round until all the energy is used up. This is how the standard diode across relay coil works. But when you have a large coil with a high ish resistance this can take some time. Adam
  2. Arouse1973

    Transistor based line following robot help

    Ok no probs, thought I was onto something then :) Adam
  3. Arouse1973

    Transistor based line following robot help

    Ah ok I just looked at the datasheet for the device and you are going to have problems. This device is designed to be optically tuned to the transmitter which is Infrared. You have a white LED which is not Infrared, it also has a daylight filter which is going to further reduce the output. The...
  4. Arouse1973

    Transistor based line following robot help

    Hello How have you connected your photo transistor? Can you draw a new circuit diagram showing how it is connected? Adam
  5. Arouse1973

    Risk of damage using an unregulated power supply

    No is the answer if as you say the 9 Volts is only attained with a 1 Amp load. Load it with a resistor to produce 80 mA of current and then measure the voltage. This will tell you what the output voltage will be when you connect your load to it. If it's higher than 9 Volts then look at using a 9...
  6. Arouse1973

    RC filter

    Here is a very crude circuit which will produce a voltage from a PWM signal. 1 us pulse produces approx. 300 mV and 25 us produces approx. 4.8 Volts. If that's what the OP wants. Adam
  7. Arouse1973

    RC filter

    Yeah I agree Chris.
  8. Arouse1973

    RC filter

    I'm thinking a little op-amp circuit personally. Adam
  9. Arouse1973

    RC filter

    I think he want's a D.C voltage. That's how I take it. Let me see if I can come up with something. Adam
  10. Arouse1973

    All in a day's.... work?

    You can't blame the designer for this, when the 555 came out in 1971 it was the bees knees, and probably designed into lots of equipment of that era. I bet the designer is kicking him self now, if he's still alive :) Adam
  11. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Hi John. There are lots of different types of arc suppression and the one I chose is a cheap popular method. It stores some of the energy from the inductor in the capacitor, reducing the overall voltage spike. The energy stored in the capacitor is then is fed back to the load when the contacts...
  12. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    I found some .INI files which allow you to change the setting for the PCB software but I couldn't find anything for the schematic editor. I'll have another go. Adam
  13. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    Not sure I'll have a look.
  14. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    Bet that was a long time a go :)
  15. Arouse1973

    Electronic distance learning course and maintenance of radio and tv

    I know what an LED is, thats about it. Any use? AdM
  16. Arouse1973

    Tablet battery mod

    I think its best not to mess with batteries, I could tell you a story about that :) and use equipment that was designed for the purpose. So if you have OEM equipment that might work, go for it. Adam
  17. Arouse1973

    Flip-Flop Circuit Using BJT's, OP Amps, and Cap Timer

    What do you want the circuit to do. You explained what you think should happen. But Mother nature has other ideas.:) Adam
  18. Arouse1973

    New Member - which forum for a simple question about using TINA ?

    No probs Pat. Your welcome. Adam
  19. Arouse1973

    Tablet battery mod

    Hello The problem is not balancing as you can balance cells like this that have protective circuits built in. The problem is the charge time. I am not sure on the battery charger IC use in these tablets maybe you can take a picture of it for us. Most of them are current limited to a certain...
  20. Arouse1973

    Trying to find a vibration or sound sensing switch / circuit

    Here is the arc suppression circuit I mentioned earlier which John requested. 1W Carbon resistor and 100 V Ceramic capacitor should be fine. Adam
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