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  1. CDRIVE

    Flasher circuit negative switching

    Oops! Since you probably can't access these resistors you should measure from ground to the common input wire, while closing each switch. Take the measurement and open the switch before closing the next one and taking your next measurement. The common input wire still needs to be disconnected...
  2. CDRIVE

    Flasher circuit negative switching

    How are you measuring this? These measurements should be made with all switches opened and the common input wire disconnected.
  3. CDRIVE

    Flasher circuit negative switching

    Are you sure of the Values of R5, R6? They seem excessively low, like they have a misplaced decimal point.
  4. CDRIVE

    Flasher circuit negative switching

    The fact that you drew that schematic, even if it is incomplete, and the fact that you were able to research and piece together what you have, tells me you're capable. Here's a thread that contains all the links and much information to wet your feet...
  5. CDRIVE

    Flasher circuit negative switching

    The ADC input of an inexpensive microcontroller (uC) will handle this and its outputs can drive those transistors. With a uC you won't need the flasher circuit either.
  6. CDRIVE

    sms controled home appliances

  7. CDRIVE

    MOSFET IRF540A circuit.

    IMHO it's a bad idea to post that within this thread. It can only yuck up the continuity of it. Oh,... "shunt" is synonymous with bypass, divert & avert. The Diode string is wired to shunt current around LED1. Chris
  8. CDRIVE

    Flasher circuit negative switching

    Welcome to the forum. I have a few questions.... Where did you get the schematic? Are the transistors shown accessible? If they are, do you know if they're good? .
  9. CDRIVE

    MOSFET IRF540A circuit.

    Justin, when you make an omelet you have to break a few eggs. Well, this is my metaphor for this circuit test. As you can see, I moved one of your LEDs to the negative (Green) lead of the uPuck's output. My guess is that it'll work fine there but since there is no data sheet of the internals of...
  10. CDRIVE

    notch rf filter

    As you can see, it was Bob's keen eye that caught that. ;) 150 ft isn't a long run for 75 Ohm CCTV. The camera/source outputs over a volt of signal level. Do you have ab Ohmmeter so you can check continuity of your shield. If you wiggle the cable at either end does the picture change. Did...
  11. CDRIVE

    notch rf filter

    That might be jumping the gun a bit. If his system is a typical CCTV 75 Ohm coax, they have extremely high immunity when properly terminated. Many CCTV monitors, actually most, have an integral switch and 75 Ohm load that's used to terminate the line. If there's more than one monitor on the...
  12. CDRIVE

    MOSFET IRF540A circuit.

    Justin, here's another test setup for you. Basically, I want you to repeat the power supply limits test that you did but wire it like this. Make your measurements from ground to TP1and TP2. You'll need two switches or just use jumpers. Chris
  13. CDRIVE

    Circuit diagram help

    I'm sure that many folks can't imagine a time when Wallwarts didn't exist but it really wasn't that long ago. Up until wallwarts became available nearly every electronics project, that wasn't battery powered, involved building a power supply. I'm not a Nanny State Drone so I don't preach...
  14. CDRIVE

    notch rf filter

    Ah, those darn decimal points! :D
  15. CDRIVE

    sms controled home appliances

    I searched "SMS" and it returned Text Messaging. So, are we talking about a device that takes commands via decoding received text?
  16. CDRIVE

    Xenon flash tube parts question

    I did a search too but all my hits were you. I even found your post on the SparkFun forum. It's a rarity to not find data sheets. Sorry that I was of no help.
  17. CDRIVE

    notch rf filter

    This is very odd because 14.7kHz is audio frequency which does not lend itself well to radiation via conventional antennas. The IF stage of an AM radio is 455kHz, which is nearly 31 times greater. In the US, the AM broadcast band spans from 540kHz to 1600kHz, which puts the lower end of the band...
  18. CDRIVE

    MOSFET IRF540A circuit.

    I just wanted to be sure. Thanks Chris
  19. CDRIVE

    Loading a blinker relay.

    All good arguments for usage of LEDs. My only issue is with the power dump. It's unfortunate that CPUs complicate the addition of a solid state flasher. Chris
  20. CDRIVE

    MOSFET IRF540A circuit.

    Yup. Have fun! Chris
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