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  1. C

    need a fuse resistor

    "Guess I could make one up with 0.5w resistors in series and perhaps put a 0.5w zero Ohm resistor in series that would act as a fuse?" This is a complete misunderstanding of how a resistor works. However 82 ohms will pass a current of 80mA and produce a voltage drop of about 6v6 and stay warm...
  2. C

    BOSCH reputable car battery manufacturer? then where are datasheets?

    " I hope they will send me 20hour discharge curve to 10.5v" Car batteries are NEVER designed for discharge to 10.5v over a 20 hour period. They are designed for 10 seconds of use at 350 to 550 amps.
  3. C

    About Servo Motors

    It's far too hard to control a servo with individual components. The input timing signal is very complex. Your teacher obviously doesn't have a clue about electronics. A 555 is analogue and is just two op amps and an amplifier.
  4. C

    Shot counter

    It's actually a piezo diaphragm attached to the stock and any number of guns can be in use.
  5. C

    Low Cost PCB Manufacturers

    Keep everything to less than 100 x 100 and the price is very low. Everything can be made in 100 x 100 modules.
  6. C

    Shot counter

    The shot counter I produce for clay targets listens for the shot.
  7. C

    oscillator help

    Dorke: To start with, the first video is a common-emitter stage, it is operating at 14MHz and uses a series tuned circuit, so it is nothing like the 94MHz oscillator we are describing. On top of this, the video does not explain how the oscillator works AT ALL and is of no importance in our...
  8. C

    How to Find the consecutive Temperature with input current for a charging IC?

    The chip can be anywhere from 75% to 95% efficient. There may be input protection diode(s) and a "catch" diode but at 1 amp nothing should get warm. I can't say anymore.
  9. C

    How to Find the consecutive Temperature with input current for a charging IC?

    It also depends on how to the IC is working. If it is a modern IC, it is switching ON and OFF very quickly and delivering the current (and voltage) in microscopic spurts. When it does this, it does not get hot and it should only be slightly warm. If it is very hot, something is wrong.
  10. C

    oscillator help

    Chris You have got to understand how the oscillator works. I have already covered your point and you still keep bringing it up. That's why I don't add long comments to the forum because I am basically wasting my time. However I get 7,000 visitors a day to my website and thousands have seen...
  11. C

    Digital Multimeter Problem "-1" !!!

    You cannot repair it. The high voltage has damaged FET 206 on the board along with IC 103. These cannot be obtained.
  12. C

    How to Find the consecutive Temperature with input current for a charging IC?

    "The temperature the IC reaches will depend on input current, how well it is heatsinked, and ambient temperature." And the input voltage The 5v input may not be 5v.
  13. C

    Reading Current of Solenoids

    If the two have completely separate power supplies, no extra protection is needed.
  14. C

    Reading Current of Solenoids

    How can a large emf develop across a 100 milli ohm resistor ??????
  15. C

    Reading Current of Solenoids

    You need to have a completely separated power supply for the solenoid, so the back emf does not enter the chip.
  16. C

    Run this 1.5v pump from a 18650 battery

    " bit I'm curious to measure these to see how long they are" They are 65mm
  17. C

    oscillator help

    I have added this to my website under SPOT THE MISTAKE Page 26: 98MHz OSCILLATOR This discussion has been taken from an electronics forum where a student has asked for component values for the following 98MHz FM oscillator. My first comment was this: You really need a cap across the coil...
  18. C

    3.2v LEDs 12v battery

    Buy 3 x brown-grey-brown-gold and 3 x brown-red-brown-gold
  19. C

    3.2v LEDs 12v battery

    You must get a resistor before we can even talk to you.
  20. C

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

    "Of course they have. The circuit simply steps sequentially through a table " THE CIRCUIT ????????? You have created NO solution. You have just given simple theoretical possibilities of how it may be done. The hard part is actually providing a circuit that ACTUALLY does all the work and...
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