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  1. dknguyen replied to the thread Comparison of reverse-polarity PMOS circuits.

    Ah, thanks. The website I ran into that circuit on was the only one its kind that came up on Google. Every else PMOS reverse polarity...

    Feb 22, 2018 at 10:43 AM
  2. JulesP replied to the thread Replacing a battery with an RC circuit.

    You are right, Im not trained in electronics but in radiation physics and I should certainly not be on the radar of your secret little...

    Feb 22, 2018 at 10:03 AM
  3. ronsimpson attached a file to the thread B562 Reduce Gain.

    You can get transistors with the Base resistors inside. "Pre-Biased transistors" I have a box of through hole transistors. (some...

    upload_2018-2-22_10-21-47.png Feb 22, 2018 at 9:30 AM
  4. earckens replied to the thread Swimming pool level detection.

    Here is another one, using a pressure sensing element: https://milonetech.com/t/standard-etape-liquid-level-sensor I guess for the time...

    Feb 22, 2018 at 9:20 AM
  5. earckens posted a new thread.

    74121 monostable multivibrator with Schmitt-trigger input, retriggerable: alternative IC wanted

    An old thread show this schematic by JimB here attached. It uses a 74121 but I have a hard time finding it and Mouser shows it is...

    Forum: Electronic Projects Design/Ideas/Reviews

    Feb 22, 2018 at 9:11 AM
  6. JulesP replied to the thread Replacing a battery with an RC circuit.

    I didn’t come on this forum to explain the detailed workings of my circuit but to explore a supercap storage system. Through the help of...

    Feb 22, 2018 at 9:05 AM
  7. earckens attached a file to the thread I need a sensor for soluble oil % concentration. Will run to an LED display.

    Is there an alternative for the 74121? I have a hard time finding this monostable multivibrator with Schmitt-trigger input. Would the...

    Feb 22, 2018 at 9:00 AM
  8. JimB replied to the thread Looking for lecture for plus null minus system.

    Sorry, that rings no bells with me. JimB

    Feb 22, 2018 at 8:57 AM
  9. dknguyen replied to the thread Comparison of reverse-polarity PMOS circuits.

    Thanks. Could you please graph the voltage of R1 and R2? I seem to have two contradicting ideas of what those voltages should be doing....

    Feb 22, 2018 at 8:49 AM
  10. Grossel replied to the thread Looking for lecture for plus null minus system.

    I was afraid of that - it is fully possible that it cannot be directly translated into english. What I do know is that it is a way of...

    Feb 22, 2018 at 8:47 AM
  11. Externet replied to the thread Swimming pool level detection.

    As this subject surfaces often, I had saved a site promoting a different method to measure levels. Check its goodness or not : ---->...

    Feb 22, 2018 at 8:44 AM
  12. JulesP replied to the thread Replacing a battery with an RC circuit.

    It works fine thank you.

    Feb 22, 2018 at 8:26 AM
  13. MikeMl attached a file to the thread Comparison of reverse-polarity PMOS circuits.

    [ATTACH] [ATTACH]

    67.png 67r.png Feb 22, 2018 at 8:17 AM
  14. Reloadron replied to the thread Swimming pool level detection.

    This is a basic over view of several methods of liquid level measurement including the bubble method which is one I like to use. Using...

    Feb 22, 2018 at 8:17 AM
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