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  1. C

    How does this work?

    Here is the article on the 555 http://www.talkingelectronics.com/projects/50%20-%20555%20Circuits/50%20-%20555%20Circuits.html
  2. C

    How does this work?

    "Just because there are a number of projects that use a 555 different ways, does not mean that the 555 is complicated." How little you know.
  3. C

    Talking Doll - No sound.

    You have to reply to him in Arabic.
  4. C

    How does this work?

    I think the best thing for you to do is look at a diagram of the 555 "It's a simple device really.." Really ???? It's one of the most difficult chips to understand. Why do you think I have written pages on the operation of the 555, just to get to understand it.
  5. C

    Oscillator

    wouldn't go the AC line way. 1. It is not accurate at all about ±5% That's not true at all. They deliver the exact number of cycles over a period of a day.
  6. C

    Windtunnel Airspeed Indicator

    1PCE BMP180 Replace BMP085 Digital Barometric Pressure Sensor...
  7. C

    Need help designing / understanding this 'circuit'

    If you need to keep your marijuana crop warm during the cold nights, you can go to your local hydroponics suppers as they have exactly what you need.
  8. C

    Windtunnel Airspeed Indicator

    You can also get a chip with hole in it to measure air pressure. This is the best as there are no moving parts and it costs $2.00
  9. C

    How to connect led??

    What is the voltage specified for the device.
  10. C

    Make a latch (flip-flop) using two relays?

    Look at this brilliant example: You short across the supply to turn the circuit off !!!!!
  11. C

    How to connect led??

    Provide more information about the 8 watt LED you are using.
  12. C

    Question regarding getting a job as electronic technician

    Show them your skills.
  13. C

    Convert +12V DC to -30V DC

    Why do you want -30v?
  14. C

    Wireless doorbell help

    The only thing you can do is pick off the signal that goes to the speaker and use it to turn on a circuit for the duration of the tune.
  15. C

    Delay off circuit

  16. C

    Question about B-E voltage.

    "I rather think that the base-emitter voltage Vbe is of primary concern because it controls the collector current Ic. Remember Shockleys function Ic=f(Vbe/Vt). It is a common misconception (to be found even in some textbooks) to believe that Ic would be "controlled" by Ib. The current into the...
  17. C

    Question about B-E voltage.

    Yes, those Philips transistors are such rubbish that the base voltage rises to 1.2v when you are trying to get 500mA through them. Normally the base voltage is around 0.7v - 0.8v for a good quality transistor passing its near-peak current. The base voltage is not important because you have...
  18. C

    TURNS PER VOLT of a transformer winding

    If you want to know how to find the turns per volt, I will tell you. No book, magazine or text book has ever told you this before. You wind 8 turns per volt and assemble the transformer and connect the supply. Feel the temperature after 10 minutes. Remove 50 turns and repeat. Keep doing this...
  19. C

    TURNS PER VOLT of a transformer winding

    Ok. If you think the TPV should be 8.02, go and wind the transformer yourself. Don't bother asking us.
  20. C

    TURNS PER VOLT of a transformer winding

    The TPV is too high for VA.
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