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  1. (*steve*)

    90v/100a DC Power Supply

    What are you doing? Making a flying car? Seriously, what are you trying to do? You're well into the realm of high power electronics, certainly not something for a beginner.
  2. (*steve*)

    Help with key lock on lg tv

    Do whatever you did to turn the key lock on, but turn it off instead.
  3. (*steve*)

    For Sale: Test Equipment For Sale

    Where are you? (It sounds like north America, but even that's a pretty big place)
  4. (*steve*)

    Another find at the Habitat for Humanity Restore

    I'll have one of them. Do you think it will fit into a small USPS fixed rate box?
  5. (*steve*)

    Current activated relay with timer

    I think the idea of a simple device which monitors the current and interrupts the power if it has been drawing (say) > 1A for more than 4 minutes is a good one. However, what happens if the microwave is set for 75% power and is effectively off for 5 seconds in every 20? That may require some...
  6. (*steve*)

    Help amplifying a tiny current

    No, it actually pulls low.
  7. (*steve*)

    Current activated relay with timer

    There are both hall effect and inductive current sensors available which can detect AC current in a conductor. The magic words you might use in your googling is "current transformer". Microwave ovens will generally stop if you interrupt the power, so this world be a sensible way to reset the oven.
  8. (*steve*)

    how do I test a small serial printer using a PC?

    A USB to serial device should show up as a com port. Any terminal emulator should allow you to set the port parameters.
  9. (*steve*)

    Want to measure temperature for my filament extruder

    Thermocouple
  10. (*steve*)

    LM4871 amplifier circuit not working, please help!

    The problem is that you likely have a mistake on your board, in your soldering, or perhaps in your actual circuit diagram. However we can see none of these. If you post pictures of your board, the first thing we will have to do (unless there is some really obvious fault) is reverse engineer...
  11. (*steve*)

    LM4871 amplifier circuit not working, please help!

    Reverse engineer your PCB design into a circuit diagram.
  12. (*steve*)

    It's 1890!

    Oooh, perhaps I should pack a GPS! :-D
  13. (*steve*)

    12v to 5v

    With a 7805
  14. (*steve*)

    transistor equivalents

    Measure the voltage across each zener diode with the power applied.
  15. (*steve*)

    7 LEDS - 4 PWM DRIVERS

    Recording audio does not play well with PWM or switch mode power supplies. You will have to be very careful about radiated noise out you may have to decide between light and sound.
  16. (*steve*)

    Mini USB on camera PCB came loose

    I have some notoriety for soldering a 1206 resistor using a 250W soldering iron with a tip more than half an inch across. However, I would concur with the advice to use a fine tipped soldering iron. :)
  17. (*steve*)

    At a resistance cut power

    Ok, if its already in circuit then it already has current flowing through it and you just need to detect a voltage range on one end of it.
  18. (*steve*)

    At a resistance cut power

    You can't measure resistance without passing a current through it.
  19. (*steve*)

    Howdy do

    $BADDCAFE
  20. (*steve*)

    7 LEDS - 4 PWM DRIVERS

    It sounds overly complex. I would just use 3 PWM circuits. Use a microcontroller to multiply the individual brightness by the overall brightness to determine the mark space ratio. 7W for 5 hours is 35 Wh. That's not a huge amount of power. Would it be operating near any audio recording...
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