Search results

Search Forums New Posts
  1. C

    LDO gets hot when using a relay module?

    Add a resistor in place of the LDO.
  2. C

    Transformer voltage

    This job is beyond your capabilities. Don't even open up the cover. "Which end of the gun do I point at my grandmother to shoot her?"
  3. C

    current flow in earthing point problem????

    "In Australia, earth and neutral are bonded together and current is shared between the earth and neutral connections." Where do you get this from ???? I'm glad you don't do any house wiring.
  4. C

    Thin Push Pull Motor

    Use a pancake motor. Look on ebay for all sorts of motors
  5. C

    Searching for motor

    Windscreen wiper motor, window washer motor. You haven't mentioned the size of the motor.
  6. C

    I cant step up voltage

    Only SOME motors can be used as a generator.
  7. C

    Tic Tac Toe, Human vs Machine using flip flops

    I did a tic tac toe with just 0's and 1's. And the machine wins or draws.
  8. C

    Need help with school project; photocell, op amp, and 555 timer

    The circuit above uses an op-amp (in fact 2 op-amps), a SET-RESET flip-flop and a power amplifier. All the requirements of the project have been met. The wide hysteresis of the two op-amps allow the project to turn the output on and off in almost any lighting condition.
  9. C

    Need help with school project; photocell, op amp, and 555 timer

    Here is the circuit. Just change the torch to a laser beam
  10. C

    Need help on constant Voltage and current

    "Connected to adj pin? What mfr? Heard plenty abt knockoffs (crap)" No. What has happened is the pot has gone open circuit and the 120R has been taken to 0v.
  11. C

    Need help with school project; photocell, op amp, and 555 timer

    In this world of skilled electronics designers, you will find they do not add components that are not needed. The 555 had exactly the same input impedance as an op-amp and because it has such a large hysteresis gap, it is ideal for detecting light on a PE cell. Just separate pins 2 and 6 and...
  12. C

    Need help on constant Voltage and current

    Do you realise that once you go below 25v, the LEDs will turn off completely. The first thing you do is put a 100R (3watt) in series with the output and measure the voltage across it.
  13. C

    Need help on constant Voltage and current

    Constant voltage and constant current are two completely different circuits. You cannot get both at the same time. The best you can do is select a voltage and have current limiting - which really means only being able to supply a maximum current and if you try to take more current, the voltage...
  14. C

    Need help with school project; photocell, op amp, and 555 timer

    Why don't you just put the PE cell in place of the switch.
  15. C

    Need help on constant Voltage and current

    Where is the 120R ?
  16. C

    Dimmer for 12volt AC LED strip

    Just put a 22R to 47R resistor in series with one lead.
  17. C

    Robotics

    show your program
  18. C

    Diodes Circuit analysis

    The diodes are reverse-biased and are not conducting.
  19. C

    Diodes Circuit analysis

    Yes. You are correct. The diodes are reverse-biased and they are not conducting.
  20. C

    Voltage sensor 10-15v

    Just use a resistor, zener diode and transistor to turn ON the micro.
Top