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  1. dorke

    Need to draw 5 amps

    FleaBay ,spoken as a true Addams. Mui bien senior Gomez;)
  2. dorke

    Mosfet / Gate drive problems

    That sure brings up memories...;) I never had a license myself ,but some friends did let me CQ a bit in the 20m band using USB, yep not that of today kind:p but the Uper-Side-Band one... The station used a 100W transceiver RF-301 which had terrible reliability and was hard to fix. They had...
  3. dorke

    Need to draw 5 amps

    And if needed a constant current circuit can be added to drive the part(s) that needs it.
  4. dorke

    Help wiring DPST Switch

    John, Are you talking about a 2 prong power connection? I'm referring to 3 ,the 3rd being the dedicated ground. Where do you see ground or anything grounded in Dave's diagram? Yes the switch uses "terminals 1 and 2" because you can connect it anyway you like.
  5. dorke

    Is there a show like New Yankee Workshop for electronics?

    May be this one will do, there are others . The Ben Heck Show
  6. dorke

    Identify diodes

    This is very hard to identify. The color code of the top one can be a 1N54A glass germanium diode(It may be if that thing is very very old). The bottom one ,who knows. How old is that converter? Are the diodes blown? Please post a good photo of the board , indicating the location of the...
  7. dorke

    Relays - non latching or latching?

    I agree with @duke37. I can add that if you use LEDs you can easily make it an all electronic thing without any relays,and it will be much cheaper. Can you please give more details of that "fast clock" you are using? It may be that you can connect the "fast clock" to activate the lights directly.
  8. dorke

    Help wiring DPST Switch

    We shouldn't confuse the Neutral with the Ground. Ground switching isn't allowed anywhere on earth! Ground should be permanently connected for safety reasons. Neutral switching for power applications like electric water boilers etc. is a good practice for safety reasons, in some places it is...
  9. dorke

    Relays - non latching or latching?

    1. Driving 12v lights with 9V source is already very dim... 2. Get a higher amperage 12V source,you may have one sitting somewhere. A 1A or more regulated SMPS wall-wart would be good,like this. 3. Check the wiring,should handle the current needed. 4. If possible, switch to LED lights,I...
  10. dorke

    Mosfet / Gate drive problems

    Good? What an understatement :( He is great and beyond !!!
  11. dorke

    Mosfet / Gate drive problems

    Hi Hop, I kinda imagined you must have been an amateur enthusiast back in the 60s-70s (it just fits you totally ;)), as so many electronics lovers were at those days. I would think with the Web of today that would be a "redundant hobby" ,but looks like it is still alive and kicking.;) Never...
  12. dorke

    I require an oscilloscope

    For portability,the ideal solution is a Laptop. A very old one P-4 running XP should be fine. You can have the software scope and the Logic analyzer both running on it...
  13. dorke

    POWER SUPPLY - REGULATOR

    Well, 1.You can use a car battery but it has to be connected to a charger otherwise you will drain it. 2.You can use any type of regulated SMPS step-up or step -down but you usually need to feed it a voltage different than 12v to get 12v... confused? well there is a "drop-out" voltage of about...
  14. dorke

    Electrolytic Capacitor Vs Ceramic Capacitor

    What is the input resistance of the next op. amp stage? Did you test it with both stages in the 2 cases- before and after PCB?
  15. dorke

    Please help a newbie connect woofer

    Very important: Don't use Chebyshev filters for speaker cros-over! The reason being it has "ripple" in the Pass-Band which isn't what you need at all! Use Butterworth filters (1st order)
  16. dorke

    I require an oscilloscope

    Here is another option for you. I think it is a better solution and a much cheaper one. For audio you can get a PC Software Scope for free. They are excellent for audio and some also have a function signal generator output. They utilize the PC audio card for input and output. A simple adapter...
  17. dorke

    thyristor vs triac

    The interesting part stars after 5:00...;)
  18. dorke

    Capacitor

    Probably,There is an "X" on it but I can't see the "2" clearly.
  19. dorke

    thyristor vs triac

    Well , Imagine asking for a "Modern Aladdin's Lamp";) here goes a true gem,enjoy:)
  20. dorke

    thyristor vs triac

    Absolutely, SCRs are used in AC application. The inventors do it lovingly like naming a new born baby...;)
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