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  1. (*steve*)

    RGB leds color changing help...

    @Hellmut1965, when you say "tension", should I read that as "voltage"?
  2. (*steve*)

    16 Volt DC conversion to 12 Volt AC

    The connection at the bottom of the cap is ground (aka 0V)
  3. (*steve*)

    Cordless phone SI transistor help

    What is written on the other side of the board where this transistor goes? Do any of the pins connect either the points marked vcc or gnd? Are the points marked vcc and gnd connected to the + and - pins on the bridge rectifier below and to the left of this transistor?
  4. (*steve*)

    HELP: project not working

    Have you tried a simple program that just flashes the LED, and perhaps opens and closes the relay in time with it? This will confirm a lot about your circuit.
  5. (*steve*)

    16 Volt DC conversion to 12 Volt AC

    More current drive for the H Bridge (If required).
  6. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    If you need more than 10A or have a voltage differential x current greater than 70, (or you want better regulation) then you'll need multiple transistors and a different circuit.
  7. (*steve*)

    16 Volt DC conversion to 12 Volt AC

    You could also use a hex Schmitt trigger inverter. You get the advantage of having 5 gates for buffering. This will give a 16VRMS output since it produces a square wave output. However I doubt it would cause a problem.
  8. (*steve*)

    Please describe the circuit

    That circuit will not teach you how transistors work.
  9. (*steve*)

    HELP: project not working

    Have you programmed the microcontroller?
  10. (*steve*)

    Headrest Car DVD players

    If you have an avi player that produces video, then you can probably split it and feed it to the video IN on both devices.
  11. (*steve*)

    Headrest Car DVD players

    The AV output is probably from the DVD player, this would not be active if it is playing an AVI. Because there's never any AV generated, there is likely no simple way to do what you want. Perhaps you could create a DVD containing your AVI's (but not just a disk full of files, an actual DVD...
  12. (*steve*)

    TDA7492P board input

    It looks like there's more differences than just the jack.
  13. (*steve*)

    DC / AC Inverter Design Assistance

    Perhaps if you google "how does a switch mode power supply work"...?
  14. (*steve*)

    DC / AC Inverter Design Assistance

    You've noted that the fly back design requires a transformer. Can these operate from DC? What are the differences between transformers used in linear power supplies vs those in switch mode power supplies?
  15. (*steve*)

    DC / AC Inverter Design Assistance

    Look at a basic description of why smps power supplies are used, and how they operate. The transformer you mentioned is a big clue.
  16. (*steve*)

    Force Sensing Circuit Design

    Put a GPS on the dog's collar and check its position from your phone.
  17. (*steve*)

    DC / AC Inverter Design Assistance

    Consider whether you need isolation. Which topologies will give you that?
  18. (*steve*)

    16 Volt DC conversion to 12 Volt AC

    Use an oscillator. Google "wien bridge". Look for something that has a globe or a thermistor or a fet or even diodes to control the gain ensuring you get a nice clean sine wave. Alternatively find a circuit that will create the waveform digitally.
  19. (*steve*)

    16 Volt DC conversion to 12 Volt AC

    I would generate a 50Hz sine wave and use a cheap class D amplifier to use it to drive the motor. At best you'll get a touch more than 11VRMS unless you drive the amplifier into clipping (which will distort the waveform to one with a higher RMS voltage).
  20. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    Damn. I forgot to draw you a circuit. Let me whip out my copy of DaveCAD... Connect the base to the output of the 317, the collector (case) to the input of the 317, and finally the emitter via a 1k resistor to ground. Measure the voltage across the 1k resistor. Operate this from your 9V...
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