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Recent content by [email protected]

  1. C

    TTL Comparator Low Output

    Many thanks Thank you every one for your help, it is greatly appreciated and I'll certainly be taking it on board. In answer to some questions: 1) The top part of the switch is to switch between two sets of LEDs. Each LED will be labelled and it will tell the user whuch of the pressure...
  2. C

    TTL Comparator Low Output

    What supply voltage would you suggest in order to get a 5V TTL? I'm new to this electronics malarky and presumed that as long as you supplied more than 5V to the comparator, when it when from 0 to 1 then the voltgae you would get would be equal to teh voltage you supplied.
  3. C

    TTL Comparator Low Output

    Supply voltage The supply voltage is what the pressure-to-voltage converters require and the comparator is designed to operate at voltages up to 32V. I've tried changing the input voltage but it just lowers the voltage I measure (e.g. 18V supply = 0.03V output)
  4. C

    TTL Comparator Low Output

    3 pole switch Basically I'm testing a pneumatic valve. I want to measure the response time for a valve exhausting from one port, to exhausting from another. Its said to switch when the exit pressure is half the inlet pressure, hence the voltage divider circuit. The 3 pole switch is used to...
  5. C

    TTL Comparator Low Output

    I have designed and prototyped a circuit to compare two pressures and send a TTL output when one pressure is bigger than half the other. But rather than the TTL output of 5V, I'm getting just 0.04V Any ideas?
  6. C

    Outputs

    I'm researching comparators at the moment and may have found what I want in the LM393. It comes with different outputs which I don't understand: Open Collector TTL CMOS Can any one explain, please?
  7. C

    Comparator

    :o Hello all I need some help. I'm measuring the air pressure going into, and coming out of, a valve. Each is hooked up to a pressure to voltage converter. I need to compare the two signals and when the pressure coming out of the valve rises above the pressure going into the valve (i.e. the...
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