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  1. HarryA1

    Transistor Substitute.

    see: https://www.nteinc.com/semiconductors/ComplPr.php    They list matched complementary pairs that maybe helpful like the NTE128/NTE129 at 80 volts and 1 ampere. And many others as well.
  2. HarryA1

    BCD calculator (urgent help in project)

    There is an article "Design Project2 - BCD Calculator" that maybe helpful. http://homepages.cae.wisc.edu/~ece352/fall02/old_project/p2.pdf
  3. HarryA1

    Repairing my Studio Microphones

    Hunter College has a course in electronics that is  online. That maybe helpful: Lessons are ElectronicsLab1.pdf through ElectronicsLab15.pdf http://www.hunter.cuny.edu/physics/courses/physics222/repository/files/pdf/ "Practical Electronics for Inventors" by Scherz and Monk is a very  good...
  4. HarryA1

    Half Bridge Driver IR2153

    The good news with the IR2153 is that it has a 50% duty cycle. The bad news is that you can not change it like in the 555 timer. You can change the frequency which would change the impedance at the coil/transformer which may give you some control of the output with the potentiometer PR1...
  5. HarryA1

    Boolean Algebra

    from Wikipedia:  = (K+L)(K+M)(L+N)(M+P)(N+Q)(P+Q)  = (K+LM)(N+LQ)(P+MQ)  = (KN+KLQ+LMN+LMQ)(P+MQ)  = KNP + KLPQ + LMNP + LMPQ + KMNQ + KLMQ + LMNQ + LMQ ----------------------------------------------------------------------------------------- K * N+LQ   +  LM*(N+LQ) K * N+LQ = KN+KLQ   ...
  6. HarryA1

    Snubber Circuit Design 230V, 16A, Problem in small load, Current Flow!

    The capacitance reactance of the 100nf would be in the order of 26.6K so that could give you a current in the order of a few milli-amperes. The leakage current of the varistor is less than 20 micro-amperes for the 7D471K.
  7. HarryA1

    Timed actuator

    You can get timers that will go down to 1 second that maybe helpful. For example: "7-Day Programmable, Minimum Setting Time is 1 Second "...
  8. HarryA1

    Any software tools to make double-sided circuit boards?

    Perhaps you may find something useful here: https://www.electronics-lab.com/top-10-free-pcb-design-software-2019/
  9. HarryA1

    Anyone knows this component?

    Most likely it is the manufacturer's part number.  Perhaps you can find a schematic diagram?
  10. HarryA1

    Voltage drop: Circuit to control fans and leds

    When the switch is closed in the debouncing circuit the input to the inverter is a logic 0 and the output a logic 1. Current flows from the battery supply of the inverter to its output. But the absolute maximum current rating for the output of a 74HC14 is only 24 ma. Do you really need a...
  11. HarryA1

    "period and duty cycle" - electronics lab"

    If you search for Arduino function or signal generator you will find some useful information.  Like: https://circuitdigest.com/microcontroller-projects/arduino-waveform-generator
  12. HarryA1

    "period and duty cycle" - electronics lab"

    The URL is: https://www.youtube.com/watch?v=bIz9ektLunE Following the link from youtube does not lead to anything useful. The code has numinous errors. It would never run, for spuddo: This is a snapshot of the serial monitor displaying the output of the code below. This is the circuit...
  13. HarryA1

    "period and duty cycle" - electronics lab"

    Given what he shows in the video one can emulate  the code easily. If that is what you would like.
  14. HarryA1

    BB-e01p

    I gather  one would need a microcomputer to interface one with the other.  I take it  the output one is not compatible with the input of the other?
  15. HarryA1

    scroll a single line lcd arduino

    or cleaner: String DisplayString = " "; //a blank string int percent1 = 0; int OldPercent = 0; void setup() { // Serial.begin(9600); //testing } void loop() { if( OldPercent != percent1 ) //do not scroll needlessly { //previous string - set the cursor to second line...
  16. HarryA1

    scroll a single line lcd arduino

    Perhaps: String DisplayString = " "; //a blank string int percent1 = 0; int OldPercent = 0; void setup() { // Serial.begin(9600); //testing } void loop() { if( OldPercent != percent1 ) //do not scroll needlessly { //previous string - set the cursor to second line...
  17. HarryA1

    Lobstamon

    "Could a capacitor smooth the frequency? " If one does not know what is  wrong with the system then one can not know what the affects of a capacitor would be. you have a 12 5kw diesel generator the generator outputs 120 or 240 volts at 50 or 60 hertz. the generator supplies the mains...
  18. HarryA1

    Transistor Substitute.

    48 volts is above the absolute voltage for this voltage regulator: 35 volts maximum:
  19. HarryA1

    Lobstamon

    In that  type of air conditioner the input ac voltage is converted into dc via a power supply. The dc voltage is converted (inverted) into  variable frequency ac. The frequency depends on the demand on the unit. A microcontroller  samples the ambient air temperature and adjusts  the speed of...
  20. HarryA1

    A motor powered by water.

    see: http://starseedsportal.org/tag/stephen-dickens-magnesium-water-copper-battery/ plus other sites; search on  "stephen dickens water battery" Also see Voltaic pile at: https://en.wikipedia.org/wiki/Voltaic_pile
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