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  1. C

    difference

    It will not be the chip. It's a dried out electro.
  2. C

    Help designing a PWM w/ 19.5 Vin and 12 Vout

    http://www.555-timer-circuits.com/pwm-controller.html That's my circuit you have suggested. It is designed for very high current. You just need 1 amp buffer. The chip will get very hot if you drive it directly at 180mA. The cap with a rectangle is an electrolytic - generally a capacitor...
  3. C

    I need a looping digital timer

    You just need a 555 with a buzzer. 59 seconds LOW 1 sec HIGH. Don't spend any more than $3.50 - the workers are not worth it. Just work them into the ground.
  4. C

    Energy production

    A man talking loudly is 50mW. How much do you want to convert?
  5. C

    Activate transistor with piezo disc

    You are not going to get anything out of tapping a piezo diaphragm until you use 3 transistors.
  6. C

    Short acting like a diode

    100 ohms and 10k sounds ok.
  7. C

    Metronome Project

    Do you want an accentuated output ?
  8. C

    Solomon SL-30 Soldering Station won't heat

    Open it up and let us know how many wires go to the soldering iron
  9. C

    Transistor bias configuration

    "The way a transistor works is not affected by the way it is biased. A transistor responds to voltage on its input and output, and does not care how that voltage is developed." Completely wrong. The way a transistor works is GREATLY affected by the way it is biased. A transistor responds to...
  10. C

    Anyone try to make a new auto battery charger "old school" ?

    All you do it take the electronics out and only leave the bridge. Then you add 2 x 2200u across the output.
  11. C

    Seven segment upsize

    The minimum voltage to get light is 8v so you need 10v to 12v supply and a 100R dropper resistor. The chip will not be able to deliver the full 20mA per segment, but you will get some illumination. A=7 B=6 C=4 D=3 E=2 F=9 G=9 DP=8
  12. C

    12vDC Issues

    Measure the ACTUAL voltage from your 12v DC supply
  13. C

    Coil replacement

    Inductance is only one attribute to a coil. I have an outdoor solar light with two coils (inductors) 0.47mH. One is 4R9 the other is 10R. They cannot be swapped over. Inductance means nothing. The wire size and ferrite core may also have an effect. It is much quicker to pull the coil apart...
  14. C

    Help with Kicad footprints (current version)

    Kicad I found to be full of bugs to the extent of uselessness. I deleted it when I found myself fighting the software rather than designing a PCB.
  15. C

    Coil replacement

    You cannot buy the component. It is called a "HOUSE'" component and its value may be very critical. It could be 100kHz or higher transfer. You have to do as I say. I have not fixed 35,000 electronic devices because I am stupid.
  16. C

    Coil replacement

    Use the soldering iron to find the end of the wire.
  17. C

    Coil replacement

    Pull the other coil apart. It is broken at one of the pins
  18. C

    Coil replacement

    What does the coil do?
  19. C

    Coil replacement

    What are you doing? Waving a magnet past the coil?
  20. C

    Coil replacement

    How many pins on the coil
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