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  1. C

    Risk of damage using an unregulated power supply

    "Load it with a resistor to produce 80 mA of current and then measure the voltage." He has already done that and the voltage is 14v. Why go to all the work of repainting the outside of the Taj Mahal and use a 9v regulator, when simply changing the tapping is all that is needed. "(if...
  2. C

    Flyback transformer spark

    Just use the $3 tube of silicon sealant and a gun. They are all the same, with incredible insulation properties. The result is better than the original HT leads and triplers.
  3. C

    Flyback transformer spark

    Just use silicon. That's all we used for 20 years.
  4. C

    Where to get a 4017 chip

    They are post free on eBay. 20 cents each.
  5. C

    Risk of damage using an unregulated power supply

    Use the 7.5v or 6v tapping. Simple. I just completed a 6 year degree in electronics and it only took me 35 minutes to work that out. !!!!
  6. C

    I can't find a replacement potentiometer

    beast pumps are a beast to repair.
  7. C

    MPPT30 Solar Charge Controller

    If you think the component fails due to a rise in temperature, simply spray it with freeze. Or use an ice-block.
  8. C

    5v regulator with lm350 with 9v input

    "and 3 amp output " "don't forget to insert 500 milliampre fuse at input pin" !!!!!!!!!
  9. C

    Newbie: Solenoid timer circuit

    You just need a power transistor connected as an emitter-follower for each output.
  10. C

    Delayed release relay circuit help

    How do you know the voltage reverses??
  11. C

    home alarm system using microcontroller

    This is far too complex for you. Start by flashing a LED with 2 transistors.
  12. C

    Newbie: Help wiring 7 segment display

    You need a LED tester. LED Tester http://www.talkingelectronics.com/projects/LED%20Tester/LED_Tester.html
  13. C

    frequency range too small on 555 timer circuit?

    C1 is going to have the biggest effect.
  14. C

    Solar Cell Prove monitoring project

    " I wandered how much solar energy I could harvest in the roofs of my house to see if that would be a good investment" You can get anything up to 1kw per metre in thermal energy. It's always a good investment because it is free energy.
  15. C

    Help building tesla coil

    Look on the web for complete projects. There are hundreds of complete projects.
  16. C

    Burglar Alarm Kit dosnt sound

    Put the buzzer directly across the battery. Does it produce an output?
  17. C

    potential health hazard from electronics

    All my staff are totally senile and sterile after breathing lead fumes all day. I provide free dementia accommodation for all those under 35.
  18. C

    Single Digit Seven Segment Display Scoreboard HELP!!

    I have 100mm seven-segment displays in a counter for a scoreboard with remote increment via 303MHz link
  19. C

    Driver circuit

    The OP has not included the current required by the "pulse transformer" so it is pointless designing anything until this is known. "Shoot-through" does not matter in this case as both transistors will be driving different loads. But possibly DC coupling will be best to get energy to the...
  20. C

    Please help me to run 4 LED's in series from 12v.

    The LEDs take about 1 amp. The characteristic voltage across the LED is about 3.3v to 3.5v. You can only put 3 LEDs in series if you want the greatest efficiency. 3 LEDs in series will require three x 2watt 10 ohm resistors in parallel 2 LEDs in series will require two x 3watt 10 ohm...
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