Search results

Search Forums New Posts
  1. roughshawd

    WallWart conversion...

    So here is the block diagram that I am planning... I don't remember my schottkey requirements. I was studying materials at the time and I was at super conductors, when they threw in the idea that "anything that will work is ok"! My circuit, with a 4.571428k requirement, I was sure a 5k would...
  2. roughshawd

    WallWart conversion...

    The thing that really needs said here is that when the power goes into a device it changes polarity. What you have is -12.21vdc, +11.42vdc, -10.42vdc, then +9.6vdc, then 2.74k negative ground.
  3. roughshawd

    WallWart conversion...

    Ok i agree... the no load off resistance is 2.74k when I check it with my meter. Maybe I needed glasses back them or something!!! The do nothing app goes on the end of the daisy chain, just like a terminator to earth. If its not there, the ground for the PSU circuit receives all the ohms the...
  4. roughshawd

    WallWart conversion...

    Always make non-fatal errors. If you don't make errors you are not human, but fatal errors make all things impossible... And when your source has an impedance of 2.74k, and you add a voltage divider to it, always return the impedance to the source value....in this case, 2.75k Where source...
  5. roughshawd

    WallWart conversion...

    Here's the device
  6. roughshawd

    WallWart conversion...

    Here's the chainand here's the connector plug, and adapter...
  7. roughshawd

    WallWart conversion...

    Here's the chainand here's the connector plug, and adapter...
  8. roughshawd

    WallWart conversion...

    Ha ha!!! Or should I say HO Ho... I got the 9.61vdc, slightly jittery from 9.57vdc to 9.61, but the voltage is there. Now which line is the divider to go in, the positive(like all the tutorials say) or in the ground(where I tested it). Or.... Should I redux the tesxtx with the resistor chain...
  9. roughshawd

    WallWart conversion...

    yep the numbers work!!! OK so when you have a 9.6v power requirement, and you have a 12v source you need to reduce the volts by 2.4v... So put a 2.5v led in the line, and you have used 2.5v, but the source is a dedicated 12v dc, and the requirement is not 9.5vdc it is 9.6vdc so the optional 2.5v...
  10. roughshawd

    WallWart conversion...

    I strung a bunch of resistors together in a linear fashion on the ground line. I achieved various results, more smaller value resistors 9.7v, less higher value reisistors 9.5v I think I will keep changing until I have the 9.6v!!! Lots of resistor options... Because I am not dealing with an...
  11. roughshawd

    WallWart conversion...

    You guys are so much fun, you're never gonna be rid of me!!! That second one.... That's what I was expecting, and I have heard of "the better way", using only diodes... But as far as I know the only way to change voltage is with a voltage divider circuit. I I did a test of this theory when I...
  12. roughshawd

    WallWart conversion...

    I have a VHS camera that requires a 9.6v 1.2amp (1200ma?) Negative ring psu wall wart. I don't find a 9.6 with 1.2 among my collection, only a 12v 2.0. can I covert this to 9.6 with an inline resistance?
  13. roughshawd

    Low frequency adjustable but stable oscillator

    optocoupler time.... just put a little sensor in there and spin it up, theres your hz and everything! But as far as motor potentiometers are concerned... what you need is called a rheostat, not a pot.
  14. roughshawd

    Is a circuit necessary in this condition?

    I have an American DJ Topaz 250 disco light that uses a special 250W 24v projector bulb that burns out after a few hours of use readily. I think the burn out is because the bulb is getting hot, but that is the nature of high power projection bulbs. The case of the topaz is small, and the bulb...
  15. roughshawd

    Simple power struggle...

    You guys are so much help!!! Ok, just like the transformer.... more power bigger wire, more current more wraps... The idea being a power problem of having too much On and not any Off... I have to say that the ability to read the wiring diagram instead of the schematic is also at odds here...
  16. roughshawd

    Help identifying a capacitor

    note worthy of the problem is that there are 2 caps there, and I would say replace both using the exact same type, they seem to be the same size and type except one has a black top which is probably the one you think blew. The one that is bulging on the top, the one closest to the center of the...
  17. roughshawd

    Simple power struggle...

    My furnace is on the fritz. Blower will not quit. I put one of those digital programmable thermostats on and it worked great for about 6 months. I found a fuse that was extremely corroded inside, replaced it and the breaker started blowing. Put in a new larger breaker, ( the furnace is rated...
  18. roughshawd

    Help converting lathe from 110v to 220v?

    The lesson here is called "contact". Where a+b+c equals all three fastened together. Check the motor and wiring diagram for differences in the connections. Connections on paper (ideal circuit) are just like connections in real life ( don't stick your fingers in there ) with exception to the...
  19. roughshawd

    220v leg isolation

    When I bought the motor last year, I bought the wrong one, it was a 115v motor without capacitor, and had to buy a new 220v instead of the 115v. I still have the 115v motor and it's brad new. Can I use 1 leg of the 220 power to drive the 115v motor? How would the wiring go so the thermostat...
  20. roughshawd

    220v leg isolation

    I will post some pictures of the wiring, so you can see what my boggle is.
Top