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  • Users: pebe
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  1. pebe

    How can I multiplex a digital signal on a DC line?

    You could use RS232 in a half duplex arrangement. Receivers and transmitters at each end all share the line. The line sits at logic ‘1’. To prevent collisions, the house could send a ‘0’ polling pulse to the tracker once every second. If the tracker had data to send it would be sent its ‘0’...
  2. pebe

    helpfull ideas for small signal amplifier please.

    ..and the previous one. http://www.web-ee.com/primers/files/slod006b.pdf
  3. pebe

    helpfull ideas for small signal amplifier please.

    Sorry, missed out the link. Here it is. http://users.telenet.be/educypedia/electronics/electronicaopening.htm
  4. pebe

    helpfull ideas for small signal amplifier please.

    ..and another for general tuition.
  5. pebe

    helpfull ideas for small signal amplifier please.

    Here's another link for tuition on op-amps.
  6. pebe

    helpfull ideas for small signal amplifier please.

    I found this tuition series that includes op-amps. http://www.allaboutcircuits.com
  7. pebe

    helpfull ideas for small signal amplifier please.

    I'll have a look with Google and see if I can come up with something
  8. pebe

    Constant Current Source Resources

    I doubt it can be done easily. You would need 2KV to get 1mA through 2Mohms.
  9. pebe

    Easy blinking LED circuit help please

    If your LED is switched on by taking the 555 o/p high, then you can keep the LED on by taking the 'trig' pin low. If LED on when o/p is low then take 'thresh' pin low.
  10. pebe

    Need a 0 to 5VDC Analog Isolation Circuit

    How about chopping your analogue waveform at a frequency that can handle its highest frequency component. Then AC couple the resulting sqare wave with a capacitor to your logic circuitry and DC restore to your logic return.
  11. pebe

    Accurate time stamping?

    Have you thought of using a microcontroller? If you arrange for its internal timer to increment successive registers, you can get a clock with a resolution of better than a millisecond and five registers will give you over 24hours. It will show relative or elapsed time - not true time. This...
  12. pebe

    Blocking Voltage

    You haven't mentioned what output voltage you expect from the circuit (ie. what is the approx value the pot is set to).
  13. pebe

    Ethical Blow...

    If you want to further the cause of justice, then just be honest.
  14. pebe

    Counters in multisim

    You mentioned your counter was not starting at zero, which prompted my reply - I assumed you were using a decade or binary counter. But when I look at your first posting I see you mention 74LS76. It was not readily apparent to me (because I only use 4000 series CMOS) that the chip is a J K flip...
  15. pebe

    Counters in multisim

    Do you reset the counter when you restart?
  16. pebe

    Strobe Light Failure Sensing

    Use a light sensor circuit to give a pulse every time the strobe lights. Use that pulse to hold off triggering of a monostable (a pulse omission detector), or bias off an astable oscillator. When the strobe fails, the monostable will fire or the oscillator will run.
  17. pebe

    measuring frequency

    melone, If someone wants to know how to crack a nut, it is better to ask how big the nut is before offering him a sledge hammer.
  18. pebe

    measuring frequency

    melone, You seem to be going to great lengths to prove that a scope is the best tool to use. Yet you don't know just what buzzly needs to measure - or why. Info that buzzly has not submitted is: What range of frequencies? What accuracy? Is waveform important? Is it a one-off measurement, or...
  19. pebe

    measuring frequency

    melone, You seem to be going to great lengths to prove that a scope is the best tool to use. Yet you don't know just what buzzly needs to measure - or why. Info that buzzly has not submitted is: What range of frequencies? Is waveform important? Is it a one-off measurement, or for continuous...
  20. pebe

    frequency clamp

    One way would be to monitor your sensor with a frequency-sensitive device (eg. a 555 wired as a monostable triggered on succesive pulses). When this device sensed 1800Hz or higher, it would switch in a 1800Hz oscillator in place of the sensor output.

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