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  1. hevans1944

    Ever seen an outlet like this one? Need right adapter

    There is probably already a double-pole 30 A breaker installed for the 3-wire dryer receptacle, and it is (hopefully) connected with 10 AWG solid for that current. If the end-user does not want to use this receptacle for an electric clothes dryer, and wants to wire a 20 A duplex outlet for his...
  2. hevans1944

    Trying to make a transistor cancel another transistor

    No, it's basically a classic job for an analog-to-digital converter and a microprocessor. Since the NTC thermistor is more or less linear over the temperature range in question, it shouldn't require anything more fancy than an 8-bit ADC. Test the range of the A/D conversions and bin them into...
  3. hevans1944

    Trying to make a transistor cancel another transistor

    I got all that pretty-print schematic drawing stuff too, but I think @dorke got it right: I drown trying to find components, place them, and wire them up pretty with all the right labels. Only do this as a last resort if I want to build a <gasp> SPICE model or lay out a printed circuit board.
  4. hevans1944

    Ever seen an outlet like this one? Need right adapter

    Ummm. The receptacle is clearly labeled 30 A. But the little "L"-shaped hole is for the neutral IIRC while the igloo entrance hole at the top is for the "green wire" safety ground. A quick test with some voltmeter probes will reveal what is going on, but if that scares you a qualified...
  5. hevans1944

    Computer/electronic integration

    Computers have been doing this since Day One. It is called an I/O (Input/Output) interface and this is how computers communicate with the outside "real world". Your keyboard, mouse, and printer interfaces are examples of I/O interfaces. The simplest I/O interface in use today is the USB...
  6. hevans1944

    Help with battery powered PC case fan

    With all the wires and problematical connections on a performance stage, hum can be a real problem. Batteries go a long way to breaking up ground loops and solving the hum problem at low-level signal points... like guitar and other instrument pickups producing millivolt signals that get...
  7. hevans1944

    Wiper Motor Wiring

    Still not sure what effect you are looking for. Take a look at this picture of a kindly old bearded man about to lift and stomp his staff of power down to cause an expanding wave-front that will split the Earth in two and fling the pieces toward Saturn's orbit... if you don't do as he demands...
  8. hevans1944

    Ever seen an outlet like this one? Need right adapter

    This plug should work with that receptacle, but there is NO 115-120 V AC available from the receptacle you have shown! It will NOT operate your washing machine with its "standard" plug. There are NO "adapters" that will make it work. The receptacle shown is intended to operate an electric...
  9. hevans1944

    Help with battery powered PC case fan

    The pedal board power supply runs off of AC line power, so what's wrong with running the cooling fan off a small 12 V DC wall wart plugged into AC line power too? If all the outputs of the Pedal Power are not in use, you can also use one of the L6 outputs (switched to select 12 V) to run the...
  10. hevans1944

    Modulating Hydraulics

    It is unclear what you are trying to DO. What does it mean "hydraulics that modulates on a linear axis"? Why do you specify a "maximum force of 60 newton meters" instead of 60 newtons? Newton meters is a torque or a moment, not a force. Some clarification, please, on what you are trying to...
  11. hevans1944

    Technology Rule

    Anything can be fabricated, witness this post.
  12. hevans1944

    Wiper Motor Wiring

    Still no picture yet, but have you thought about just using an electromagnetic solenoid to lift the "staff" and then drop it? This would require some sort of support structure for the solenoid located above the sounding board. You will probably need a spring to make the "whacker" part of the...
  13. hevans1944

    Trying to make a transistor cancel another transistor

    You can replace the 2N2222 NPN transistors with the 2N5401 PNP transistors if you reverse the LEDs and substitute a negative 4.5 V supply for Vcc.
  14. hevans1944

    Running LED - all LED turn ON when reach the last LED?

    Also note there is only ONE current-limiting resistor for all sixteen LEDs in the original schematic. That's enough if only one LED will be illuminated at any given time, but if you try to turn on all sixteen at once... poof! So, besides opening the connections to the cathodes of each LED to...
  15. hevans1944

    Trying to make a transistor cancel another transistor

    I do agree with Chris on this: you have to learn to crawl before you can stand up and walk through the forest that is modern electronics. To jump from "foolin' around" with 2N5401 PNP transistors (because you have a boatload of 'em) to using integrated circuits doesn't require a leap of faith...
  16. hevans1944

    Wiper Motor Wiring

    No image yet. Please upload again.
  17. hevans1944

    NPN transistor as switch for LED problem

    Sorry, Chris... there is no collector-emitter junction. There is the emitter-base junction and base-collector junction between the emitter and the collector. Melt those junctions to create an emitter-collector short. You can tell you have done this "right" by measuring the resistance from...
  18. hevans1944

    A Welcome to EP For AudioGuru

    Nice avatar. And welcome to Electronics Point. Thank you for responding to the noob who posted in this thread. Hop
  19. hevans1944

    Does anyone know the name of this connector

    Okay, I didn't dig out a mouse or keyboard and count the pins, but it's still a DIN connector, both the 6-pin PS2 mouse and keyboard connectors, as well as the 5-pin DIN connector that @Jordan Dawes posted. There are many variations on this theme: The "slotted" female contacts conceal...
  20. hevans1944

    Trying to make a transistor cancel another transistor

    Whatever happened to the "good old days" when everyone was trying to improve on the AM-band crystal set receiver by using them thar newfangled and expensive transistor thingamabubs? Audio amplifiers, regenerative RF amplifiers, and such? Lots of fun trying to figure out bias and trading off gain...
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