BobTPH's Recent Activity

  1. BobTPH replied to the thread Electrical charge from air coming from a furnace vent, positive or negative?.

    If the balloon is spinning, John is probably right. Bob

    Oct 20, 2018 at 1:56 PM
  2. BobTPH replied to the thread Ardunio-30 Led Vu Meter out of pins.

    15 x 2 would use 17 pins. 6 x 5 would use 11 pins. Bob

    Oct 20, 2018 at 10:59 AM
  3. BobTPH replied to the thread Mixed Power Voltages in unipolar linear transistor amp?.

    If you don't need any amplification, why do you need any circuit at all? Maybe it is time to tell us where this signal is coming from...

    Oct 18, 2018 at 11:18 AM
  4. BobTPH replied to the thread Mixed Power Voltages in unipolar linear transistor amp?.

    An op amp. @Bordodynov's circuit is nearly as complex as a basic op amp. The reason op amps work so well is that they use very high...

    Oct 17, 2018 at 5:23 PM
  5. BobTPH replied to the thread Mixed Power Voltages in unipolar linear transistor amp?.

    You won't do that with a single transistor. Use a friggin' op amp, despite what you learned on someone's youtube video. Bob

    Oct 17, 2018 at 1:01 PM
  6. BobTPH replied to the thread Idiot trying to make a music box for his girlfriend..

    Or a hall effect switch and magnet. Bob

    Oct 17, 2018 at 12:46 PM
  7. BobTPH replied to the thread Mixed Power Voltages in unipolar linear transistor amp?.

    AC is easier because transistor amplifiers need a bias voltage to operate. You just stick capacitors at the input and output, and this...

    Oct 17, 2018 at 10:53 AM