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  1. HarryA1

    Circuit to monitor your Ac transformer and send you a message unto your phone

    What are the status attributes of a transformer other than temperature?
  2. HarryA1

    Creating a USB-C Passthrough with power charging detection

    See:  https://en.wikipedia.org/wiki/USB  Be sure to look through the references at the end of the article.
  3. HarryA1

    Grounding issue with a turntable. House wiring? Ground loop?

    Also see: What is a turntable ground cable
  4. HarryA1

    Grounding issue with a turntable. House wiring? Ground loop?

    Does the turntable have electronics in it; preamplifier and power supply perhaps?  The capacitors in older electronics often go bad with age. see: https://en.wikipedia.org/wiki/Ground_loop_(electricity) note the section: "In low frequency audio and instrumentation systems" and the note near...
  5. HarryA1

    doubt storage batteries

    As gamer87 you have quite a reputation on the maker.pro forum. They lock the door as soon as they see you coming! They have no sense of humor over there.
  6. HarryA1

    Assistance with the voice changer using AP8072 IC

    In circuit 2 for the RTS0072 note they have an RC sub-circuit at pins 1 and 2, I would try that. Also note at pin 16 there is a resistor Rb to prevent pin 16 being pulled to ground. Perhaps required? Note it uses a 4.3 volt Zener; it must work okay with that voltage.
  7. HarryA1

    Error code 2S119/1

    I found the forum cookies were blocked on my end. I had thought  I had removed the URL from about 20 or so sites I have blocked from setting cookies. Thanks for looking on you end.
  8. HarryA1

    Error code 2S119/1

    When I try to login with my desktop computer I get this error code. Forum is unhappy with my desktop computer. I can login via my laptop okay. [contact us] does not work also - can not enter a message.
  9. HarryA1

    Assistance with the voice changer using AP8072 IC

     I would work on the voltage first. Although the specs, say 3.0V ∼ 5.0V for the RTS0072 ,there must be problem somewhere. The condenser mic. should not be drawing any current, try disconnecting it then recheck the voltage. Pop out the RTS0072 also. Specs. for the chip are here (see the second...
  10. HarryA1

    Assistance with the voice changer using AP8072 IC

    The 1.69 volts at pins 11 & 12 suggest the Zener diode is in the wrong orientation. The 1.69 volts is the forward voltage not the reverse voltage of 4.7 volts you are looking for.  If not try popping out the RTS0072 and recheck the voltage, perhaps it is shorted.
  11. HarryA1

    Assistance with the voice changer using AP8072 IC

    I looked at your photo in  photoshop where I could enlarge it, looks okay from what I can see of it. Check the voltage at the speaker and pin 6 of the LM386 for the 6 volts. Also check the voltages at the mic. and pins 11 & 12 at the RTS0072 for the 4.7 volts off the Zener diode. It is...
  12. HarryA1

    Assistance with the voice changer using AP8072 IC

    Without a schematic of your circuit and a closeup photo of your circuit it is not possible to help you.
  13. HarryA1

    Power Supply without "Power Saving Mode" -Seeking Advice on

    There are two types of USB power suppliers; the USB power supply and the USB power supply charger. It appears  you are  using the charger. Consider using a USB hub connected  to the charger then connect your led/motion detector plus a simple LED device. The LED device would have a constant...
  14. HarryA1

    PROJECT to replace a MMBT3904 in a Lenovo G710

    Comparing the two data sheets they appear to be nearly identical. the MMBT3904's higher current rating may make it last longer.
  15. HarryA1

    voltage control

    Here is a circuit that may work for you.  I have a 10k thermistor and a MJE3055. I could try it on a breadboard if you like; converting it to 12v.
  16. HarryA1

    unknown PWM controller

    That is most likely an internal factory  number. Remember they do not want you to repair them but to buy new ones. There are a number of  videos on youtube in regard to chargers. Search on " Black&Decker 18V Li-ion charger " for example: https://www.youtube.com/watch?v=c-pTziUV1as
  17. HarryA1

    Help needed

    I believe this is what you need: push botton switch.asc push botton sw.xcf
  18. HarryA1

    Routing pulses

    Is the action  like this?  I got to many cd's Are you comfortable using a micro-controller like an Arduino UNO? time:   action                      switch 1    switch 2      0:     hv pulses charge C1    at ca        at cd S2's 1:     C1 is charged to 24v   at cd         at cc 2:    hv...
  19. HarryA1

    Routing pulses

    What types of short period are you interested in?  What divert times are you interested in? An inductor  in series with the source and load would retard the current going out and when the magnetic field collapses there would be a back emf towards the source. A length of coaxial cable would...
  20. HarryA1

    high voltage ground Isolation

    I used an optocoupler between an Arduino Uno and a mosfet at 350 volts for an capacitor discharge ignition circuit.
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