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  1. Arouse1973

    Transient Voltage Supressor (TVS) Operating Voltage

    As Dave says you need to check the data sheet. But I doubt you will find a graph showing the current versus applied voltage, I might be wrong. I have never seen one as you are supposed to operate them within the limits set out in the data sheet. Adam
  2. Arouse1973

    Transient Voltage Supressor (TVS) Operating Voltage

    Hello The TVS working voltage is normally specified so a maximum of say 5 uA to 1 mA (dependant on the power handling of the device) of leakage current is obtained when working normally. The trigger voltage is the voltage when the TVS is fully on. You obviously want to stay clear of this voltage...
  3. Arouse1973

    Help with PSU noise

    No probs Gary. Adam
  4. Arouse1973

    Help with PSU noise

    No probs. 150uH and 220uF cap and another 150uH inductor. The two inductors in series with the output and at the join junction of the inductors the capacitor to zero volts. Or just try one inductor and cap. Adam
  5. Arouse1973

    Help with PSU noise

    What values did you use? Adam
  6. Arouse1973

    Help with PSU noise

    That's probably because at low load the frequency of the switching will be lower because it's doesn't have to refresh the energy lost from the output capacitor. Adam
  7. Arouse1973

    Help with PSU noise

    Ok so maybe a simple LC or T-LC will help. it's worth a try Gary. Adam
  8. Arouse1973

    Help with PSU noise

    Hello Gary Is this power supply something you purchased? Do you know much about the design and whether it had audio use in mind when it was designed. I am initially thinking a T-LC filter. Adam
  9. Arouse1973

    Ohms to trigger a switch

    Yes that circuit was just what I had in mind :). Nice one Adam
  10. Arouse1973

    Ohms to trigger a switch

    Hi Alan can you explain a bit more about your project? Where is this 150R coming from? Adam
  11. Arouse1973

    Logic gates, pull up/down resistor

    Your job for tomorrow is to sort out the wiring :), it's quite messy and those long wires might not be helping matters. Make all connections as short as possible. Move the top IC down with the others if you can. This will reduce the length of the wires. Adam
  12. Arouse1973

    Logic gates, pull up/down resistor

    Ok I see it now, thanks Adam
  13. Arouse1973

    Logic gates, pull up/down resistor

    Your circuit could also be oscillating which is why you are measuring 2.5 Volts. Adam
  14. Arouse1973

    Logic gates, pull up/down resistor

    OK, good night
  15. Arouse1973

    Logic gates, pull up/down resistor

    Is the top IC defiantly grounded (connected to zero Volts) Can you take another picture showing the top IC?
  16. Arouse1973

    Logic gates, pull up/down resistor

    I just wondered why you had that little red and black link. Are all those separate blocks going across the breadboard joined together? It's been 25 years since I have used that sort of thing. Adam
  17. Arouse1973

    Logic gates, pull up/down resistor

    Yes unused inputs to ground. Decoupling 2.2uF and 100nF across the supplies of each IC make sure they are as close to the IC power pins as you can get them.
  18. Arouse1973

    Logic gates, pull up/down resistor

    Is the IC in the middle grounded? Adam
  19. Arouse1973

    Logic gates, pull up/down resistor

    You don't have any decoupling on the supply lines. Why have you got one IC miles away from the others. if you have any gates that are not used they inputs must be terminated. Adam
  20. Arouse1973

    Logic gates, pull up/down resistor

    It looks like you have added pull down resistors which are not on your schematic. Is this correct?
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