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  1. C

    help with a basic 5 LED circuit

  2. C

    Measuring the speed of a Frisbee & Boomerang

    I would take a video and slow it down and read the RPM.
  3. C

    How to design a Flip Flop using 555 Timer ?

    "There are also monostable and astable multivibrators, but not monostable and bistable flip flops. " How would you know ?????
  4. C

    Record player motor voltages

    It's the frequency that is important
  5. C

    Good charger for li-ion batteries?

    You can buy an individual charger for $2.00 Use 4 separate power supplies and 4 separate chargers.
  6. C

    Help a blind man in electricity

    "and I'm still dumb." If you are dumb, how come you know so much about electronics.?
  7. C

    Help a blind man in electricity

    "I am squinting very hard, but I don't see any color in the drawing" That's what happens when the "blind leads the blind."
  8. C

    Help a blind man in electricity

    "Hope my answer doesn't offend anyone." Only the blind should help the blind.
  9. C

    Help a blind man in electricity

    I used to be a blind man. But about 20 years ago I stopped selling blinds. 5v is on the diagram. This is the red lead in the diagram. This is called the positive lead. The black lead from the 5v goes to the earth symbols. This is the negative lead.
  10. C

    Problems Programming PICKIT 2 Clone

    Are you getting 13.6v Vpp
  11. C

    Need help with my first DIY project

    You need a SMPS that will input from 13.5 to 20v and output 12v. You can get some 3 amp versions for $5.00 on ebay You panel is far too big for a back-pack. Where are you going to fit all your tins of spaghetti?
  12. C

    Need help with my first DIY project

    What is the battery voltage?
  13. C

    Low Cost PCB Manufacturers

    To keep your boards as cheap as possible, allow 70 thou between boards and cut them yourself with a hax saw. Linish the edges with sandpaper. Make sure you can cut between all the boards before you send-off the panel. This will get you 12 panels from Elecrow and they will not give anyone else...
  14. C

    How to design a Flip Flop using 555 Timer ?

    Flip Flop is the broad name for 3 different types of circuits. They are monostable flip flop (one state for a short period of time and then reverts back to its stable state) Bistable flip flop and (two stable states that must be activated into each state) Astable flip flop. (the circuit...
  15. C

    Little help: Pool for 3 project design ideas

    You just need to read the voltage from a piezo diaphragm. Just a micro and a piezo.
  16. C

    Analogue DTMF (dial tone) Decoder help

    It is very difficult to read DTMF via a program. It has been done by an absolutely brilliant programmer. It is much easier to use a DTMF chip.
  17. C

    voltage operated relay for automotive

    You need a zener diode and some ordinary signal diodes, a few resistors and a transistor.
  18. C

    Need help selecting components for solar a battery charger.

    Get 2 more of the solar cells and connect them all in series. You don't need any diode.
  19. C

    Low Cost PCB Manufacturers

    "Those prices really aren't bad.." Are you kidding !!!! Ragworm wanted $400 for my boards. I pay $15 !!!!
  20. C

    Current limiting using an Arduino microcontroller

    And you want someone to design this for you for $2.50.
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