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  1. (*steve*)

    Led stair lights with 2 motion sensor. circuit help!

    I doubt that you'd point the PIR at the LEDs.
  2. (*steve*)

    Power Train PTG 6500 Spark Plugs

    @Peg Marion, that sort of response is why I think I should have stuck with the lmgtfy link.
  3. (*steve*)

    Led stair lights with 2 motion sensor. circuit help!

    I was thinking passive infra red sensors, so your body emits the light they detect
  4. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    As far as I can tell, that coil is used for things used rarely (ball ejectors), not flippers. But hey, the answers I've given you are based on the specs of the mosfet. It is also possible that your coil is partially shorted. This would increase the current through it, and for DC use, may not...
  5. (*steve*)

    Trans hum

    If the dimmer is connected to the output then it is likely the power supply is making sound at a frequency you can't hear. The dimmer is causing the load to be connected and disconnected many times per second and this modulates the high frequency sound being generated by the power supply. You...
  6. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    Then there is something different or your specifications of the coil are inaccurate. Please check your solenoid here. Is it there? What type is it?
  7. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    Don't worry too much about that. My calculations suggest this won't contribute too much. Those on working boards It's an Rds(on) of some mosfets which have a low Rds(on). Reducing the duty cycle (say turning the solenoids on for 100ms every 3 seconds) would also help. (you want the duty...
  8. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    Even switched for 100ms every couple of seconds, I'd be employing a gate driver to reduce the switching and to ensure that I gate the gate as close as possible to +5V. Your circuit will probably switch quite slowly, and the peak power will be very high -- this may not result in failure due to...
  9. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    OK, if the coils could get damaged then they sound like they're either not rated for this voltage, or not rated for continuous use -- which is it? Do the SAME coils work with the different driver? You need to measure the voltage across the mosfet with the real load to determine the actual...
  10. (*steve*)

    Led stair lights with 2 motion sensor. circuit help!

    There are many motion sensors available. you have two, so you need to operate the LEDS when either is active. These often remain ON for some period after they detect movement, so you probably won't have to do that yourself. A light sensor based on an LDR is pretty simple. Sometimes they are...
  11. (*steve*)

    What's the best way to learn any programming

    The language is C++. It's not, as many people think, some Arduino language "like", or "based on" something else. After some fairly trivial modifications your sketch gets passed straight to a C++ compiler. See here. If you're so inclined, you can use other build environments with the same...
  12. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    OK, maybe you don't understand. Firstly the voltage will be between zero and your power supply voltage (so is your power supply 54.7V?). Under load this may drop, but I'm not too concerned about that) Secondly, this must be done under load, so connect up the solenoid. If you don't already...
  13. (*steve*)

    MOSFET burning up but similar circuit on another board is fine

    OK, what about the voltage across the mosfet (drain to source) when the load is switched on?
  14. (*steve*)

    I'm getting there, slowly

    The most glaring issue I see is that the connections to the bridge rectifier in the first image (RHS) are not insulated and are quite close to an exposed heatsink. At the very least, slide a piece of insulating material between the heatsink and the leads. In general, the quality of insulation...
  15. (*steve*)

    Power Train PTG 6500 Spark Plugs

    Actually, let's give @Peg Marion a little credit and assume that we are a last resort after searching google, calling the retailer and/or manufacturer, asking around, and not finding anything. A good question would have included these facts, because that's where most people would go first...
  16. (*steve*)

    Dumbwaiter Logic Circuit

    You also need to consider the speed of your dumb waiter. Depending on any number of characteristics, if the motor is just turned on our off, the case may start and stop with a jerk. That may be fine for moving some items, but less so for others (souffles, for example). More importantly...
  17. (*steve*)

    how can i adjust the Av gain of this amplifier from 12 to 10, the AC signal is 10mV, 1kHz,

    @NYAME EPHRAIM, please be careful that you understand @Audioguru's answer. If you use it literally, you might get the answer right in practice, but wrong in your assignment. I suggest that you make sure you understand the relationship between the resistors and the (appropriate) gain of the...
  18. (*steve*)

    So I broke...

    Once you get the LEDs working, get a webcam pointed at them, and wire a program which creates a web page showing the LEDs and allowing them to be controlled. Post a link to the the page here and I'm sure one of us will play with it to change the display on the LEDs. If you decide to provide an...
  19. (*steve*)

    Power Train PTG 6500 Spark Plugs

    Wait, wait, please lmgtfy.
  20. (*steve*)

    100 milisecond delay circuite

    And since this is homework, I won't tell you if my circuit is a reasonable answer. If your studies have included logic gates, then you should be able to figure that out for yourself. What have you studied? Something in there will likely provide an answer.
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