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  1. J

    Tektronix 2430a ram chip question

    Have a read of this
  2. J

    Checking PIC18F4520 Timer 0 overflow

    Post the offending code section, including errors, inside 'code' tags
  3. J

    Multiplex IC 5 inputs and 5 outputs custom?

    Still a little hazy on what you are doing: in the picture of the pogo-pin fixture I see a setup that only has ONE possible connection scheme. Are you pre-programming ESP8266's and then placing them on various PCBs?
  4. J

    Inverters

    Where did you get a 90 volt AC motor? Ninety volts DC is very common
  5. J

    DOD Mixer Power (34 V)

    The attached schematic is called 'Mixer Power Supply' Seems to me that the entire circuit- headphone amp, tape out out and rectification/filtering - is what is missing. The mixer itself is probably a crapton of opamps and slide-pots, all connected to header H1 with a flat cable
  6. J

    LCD Display of Same Specification doesn't work

    Read this for some notes
  7. J

    Is it possible to fix old PC monitor

    There is an unsoldered(?) terminal in the seventh picture, neat the words "Rev 03"
  8. J

    It’s time for consumer Electronics Manufacturers to label their transformers!

    Most devices/appliances are labeled with the required voltage/current. Differentiating among 2.0,2.1.2.3 and 2.5 mm barrel connectors is a problem, tjough
  9. J

    Board requirements

    Teensy 3.X might do.
  10. J

    RS Logic AB PLC Timer Problem

    Is there a backup battery in this device? "ten years" and "timer setting =0" make one suspect that.
  11. J

    STOP 2nd phone line from ringing

    When VOIP phones went in here (California), the modem had an output ffor POT units that preserves the use of existing phones.
  12. J

    Operating 266V Motors on 230V..... Explain Please

    That motor may run with no problems on 277/480V, 60Hz
  13. J

    Odd switch I cannot figure out

    Is the new switch a MAINTAINED CONTACT type? If so, that's a problem. It wants a momentary type.
  14. J

    Particle swarm LED lamp

    PJRC.com has a WS2812-driver board that, combined with one of their CPU boards, can drive hundreds of LEDs via DMA. leaving the CPU nearly idle.
  15. J

    Adafruit Oled Driver Library Change Logo

    It looks like the *.cpp section accepts three different logo-lengths: 16x12 bytes, 16*(12+20) bytes, and 16*(12+20+32 bytes.) What is the size of your proposed logo? Also, maybe show the errors being generated.
  16. J

    Surface Mount Part Identification - TC

    That's Tantalum Capacitor
  17. J

    Please Help Water Pump Issue

    Replace that capacitor. If that doesn't work, you have used up the low-cost repair strategies, and must replace/repair the pump.
  18. J

    How to use switch statement

    You have not said what you mean by "does not work." That said, make sure that the LEDs work by blinking them several (or several hundred) times just after reset Until you know that your hardware works, you can't say that the program is faulty
  19. J

    Nordic semiconductor

    You can use Arduino... about halfway down this link there are instructions
  20. J

    Need recommendation for rheostat or potentiometer

    The requirements you cite are very restrictive, especially if batteries are to provide the lift. Rheostats at those power levels are big, heavy and will run hot Also: a 12-volt computer fan is almost certain to a brushless motor. Can you use line power, perhaps with a very light tether/cord?
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