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  1. Arouse1973

    will a basic buffer be sufficient?

    Ok I see now I think. You are basically switching in different voltages instead of you adjusting the original POT each time?
  2. Arouse1973

    will a basic buffer be sufficient?

    I thought you were going to draw your own circuit that you could follow? I misunderstood Adam
  3. Arouse1973

    Need help reverse engineering a PCB

    Hello Can you take a nice picture of the PCB on both side, we might be able to work something out. Adam
  4. Arouse1973

    How to power an induction hob coil

    Hello and welcome to EP Can you tell us a bit more about your project. How powerful do you need it, what's it doing? Thanks Adam
  5. Arouse1973

    will a basic buffer be sufficient?

    Ok so when you have drawn your circuit let us have a look and we can sort it out for you. Cheers Adam
  6. Arouse1973

    will a basic buffer be sufficient?

    Yes I agree Chris. I could specify the op-amp in less than 5 mins if we had all the information. On the flip side to this you get people apologising for giving too much information, makes me laugh. Adam
  7. Arouse1973

    dual opamp, only need 1?

    Op-amps are a bit different to terminate properly. You should always have feedback like a unity gain non inverting buffer and either connect the non inverting terminal to 0V for split rail PSU or mid supply for single supply PSU. Thanks Adam
  8. Arouse1973

    will a basic buffer be sufficient?

    This is not complicated, it's getting confusing, as Chris said the first circuit works better. Why can't you draw your circuit and post it here. You only want us to choose the op-amp for you so I would have thought you had everything else sorted. Or do you want us to design the rest of the...
  9. Arouse1973

    will a basic buffer be sufficient?

    And what about the other questions? Thanks Adam
  10. Arouse1973

    Carbon Monoxide detector circuit

    See what the operating range is for the buzzer, it might work with 3 volts and just be quieter. Give it a try. Adam
  11. Arouse1973

    Carbon Monoxide detector circuit

    Oh one other thing make sure you get a D.C buzzer and not a transducer. People call them the same, but the transducer types require a varying signal to drive them and won't work with just a constant D.C level.
  12. Arouse1973

    Carbon Monoxide detector circuit

    Nope that's it, the LM393 has an open collector output so you connect the buzzer - Pin to the sensor and the + Pin to 5 Volts. These sensors normally draw quite a bit off current in the 150-200 mA region, because they have a heating element inside. So make sure your power supply can supply this...
  13. Arouse1973

    Carbon Monoxide detector circuit

    That's the IC they are using to generate the TTL level. What I was trying to find was the data sheet for the actual module. However it does tell you the output can sink 20 mA. So you need to find a buzzer that draw this much current or less. Otherwise you are going to need some kind of current...
  14. Arouse1973

    Carbon Monoxide detector circuit

    Yeah it's poor really. You can get one of the sensor on it's own but for the module I couldn't find one. Adam
  15. Arouse1973

    Carbon Monoxide detector circuit

    I think it could be that simple. What buzzer are you going to use? Adam
  16. Arouse1973

    Carbon Monoxide detector circuit

    Look at the words in the link you provided, I think it's what they call the CO module?
  17. Arouse1973

    Carbon Monoxide detector circuit

    Could SCM be sensitive control module? TTL is digital level which for an output is around 0 to 0.4 Volts for a low level and 2.6 to Vcc (5 Volts) for a high level. Adam
  18. Arouse1973

    Carbon Monoxide detector circuit

    Hi Chris, does it have any markings for the pins on the other side of the PCB. Your going to have a TTL (Digital) output an analog output and +V and 0 V (Common) Adam Oh welcome to EP
  19. Arouse1973

    will a basic buffer be sufficient?

    Ok so what is coming in on IN? Vr I assume is the voltage from the potential dividers. You will be supplying +V with 9 Volts and 0 Volts for the -V pin what is your lowest and highest input voltage? Thanks Adam
  20. Arouse1973

    Help with crossover repair on MK S–55 tri-pole speaker

    Hi Adam I am pretty sure this is a 2.0 uF 50 V metallized Polypropylene capacitor. You should be able to find a replacement easily on the net if you need to. Try some audio component suppliers. Thanks Adam
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