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  1. GPG

    Thermostat

    I have a sim of the cap-based supply and the relay will pull the voltage down to abt 7V,
  2. GPG

    Thermostat

    What value is the capacitor just below ZD1?
  3. GPG

    Thermostat

    Some of it. Grey capacitor. Everything you find "brand and what it looks like a serial number of sorts."
  4. GPG

    Help! Repairing water damaged PCB from Massage chair.

    http://www.dummies.com/how-to/content/capacitor-tolerance-code.html
  5. GPG

    Thermostat

    What value is the Grey capacitor? Details on SSR (black box)
  6. GPG

    Reading Current of Solenoids

    http://www.allaboutcircuits.com/textbook/direct-current/chpt-8/kelvin-resistance-measurement/
  7. GPG

    Power Supply

    I think he wants to synchronise several gen-sets. Maybe? Genset = motor/Generator. Requires a synchronising panel.
  8. GPG

    Need cheap buffer for audio device

    Yes. But + to the ground if you have bipolar supplies. Yes. as long as the combined input of 10 keys ( I only have 5 on each hand) doesn't over voltage the amp, and the impedance the amp has to drive is so far unknown, otherwise only one amp
  9. GPG

    Single Digit 7 Segment Display Up Down Counter

    A CD4510 and A CD4511 should do. May have to debounce the clocks. What kind of switches? Reset reqd?
  10. GPG

    battery decorations converted to mains tranformer

    You could run them off a 4.5V wall wart all in parallel, Operating off batteries I dont think the current will be an issue This will need couple of diodes to drop the voltage,
  11. GPG

    Need cheap buffer for audio device

    Add as many R1 as needed. Since the output is low impedance the value is not very critical 10K will do. Set the gain with R2 The other resistors are to set the operating point to 1/2 V for single supply, not needed with dual supply. Is this a Hammond Rotary?
  12. GPG

    Need cheap buffer for audio device

    Schematic? What impedance are the circuits happy to drive ? (one output)
  13. GPG

    Adding "on" light to 240V thermostat

    https://www.nema.org/Products/Documents/NEMA-GFCI-2012-Field-Representative-Presentation.pdf Only 240 here.
  14. GPG

    Faint display on Aiwa Tuner

    Use the meter 200V~ (white) setting, If you can borrow one with a lower range would be better. 200V= for the -30V .
  15. GPG

    LED STAIRS

    Picture of stairs?
  16. GPG

    DVD player wont play

    Most machines look for a disc when the tray closes If you can see the lens watch what it does Usually the lens will attempt focus lock (goes up and down). The usual no of attempts is 3
  17. GPG

    Faint display on Aiwa Tuner

    What meter do you have? Doc 65-66 Measure voltage at display pins F1 to F2 AC voltage. Measure between F1 ,F2 on con 2 AC
  18. GPG

    Store on hard drive

    And a flash drive will be easier https://en.wikipedia.org/wiki/USB_flash_drive
  19. GPG

    7-segment display 3-to-8 decoder logic circuit (please help, thank you)

    Yep. But there is still the use of gates to achieve the final result. I have scribbled down a solution that takes into account available parts (minimised) and I would like to see the solution
  20. GPG

    7-segment display 3-to-8 decoder logic circuit (please help, thank you)

    It's specified, not random. I'm looking for OP to post a circuit of the gates used to complete
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