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  1. hevans1944

    Serial communication problem.

    Here we are in the 21st Century and some people are STILL farkling around with "RS-232" serial data protocols. I once worked with a technician in the 1980s who seemed to make a career out of connecting two devices using "RS-232" cables he would custom wire for the purpose. He was your "go to"...
  2. hevans1944

    Motion sensing mouse trap

    I found a Victor electronic mouse trap, complete with partially decomposed mouse, in my backyard last year. We lived near some apartments, so I suspect the owner of the trap just tossed it out the door after the trap had done its job. These things cost about twenty bux and are said to kill up to...
  3. hevans1944

    Low cost SMT links

    Digi-Key offers Keystone brand jumpers in various sizes. Copper bars that are silver plated. Available on tape reels and as cut tape. See here. Ummm, how would you attach aluminum bars to a circuit board? Miniature TIG welder?
  4. hevans1944

    AC current help

    Sure sounds like a "coil gun" or something similar. I remember a high-school demo of a 60 Hz, line-operated, electromagnet with a rigid cylindrical "pole piece" sticking about eighteeen inches or so above the base of the magnet. Teacher fired it up and demonstrated how it would "levitate" a...
  5. hevans1944

    Guitar Amp Modification

    A 12 V SLA will work "as is" since the guitar amp has a supply voltage range of 9 V to 12 V according to OP's image.
  6. hevans1944

    Guitar Amp Modification

    If you want to "be mobile" consider using a 12 V sealed lead-acid battery. These are popular for use in emergency exit lights. It should run for at least an hour before requiring a re-charge, depending on battery size. Of course you will need a lead-acid battery charger, so I don't know how that...
  7. hevans1944

    Guitar Amp Modification

    The image you uploaded shows the device runs from a 9V to 12 V "wall wart" power supply capable of supplying up to 500 mA, and that the amplifier provides up to 3 watts RMS output power over the stated range of input voltages. That current and voltage works out to 4.5 watts for 9 V input, and 6...
  8. hevans1944

    Optical Pickup

    Aren't we getting waaay off into left field on this? There IS a commercial optical pickup available. Quoting from the Lightwave Systems website: I think the "array of photodetectors" is actually just two differentially connected detectors for each string, but this is easily verified by simply...
  9. hevans1944

    mmwave sensors

    The human body does not emit millimeter wave radiation, so your "small mmwave sensor" would sense...nothing. OTOH, if you illuminate the body with millimeter wave radiation, the back-scattered radiation is detectable using radar principles. Google seems to enjoy the lead on gesture recognition...
  10. hevans1944

    AC current help

    As high as possible amps? What AC voltage do you need? Is 240 V AC adequate to the task? Is 200 A enough current, or do you need more? Does the AC have to be sinusoidal, and if so, how much harmonic content is acceptable? What kind of load does the inverter supply? Motor? Lighting? Heater? Giant...
  11. hevans1944

    Dayton model 3m292a

    Is there a capacitor associated with your motor? I would guess that @Minder could help you with this. Or you could twist the black and brown wires together and connect to black wire on the power cord. Twist white and blue wires together and connect to white wire on the power cord. If you need an...
  12. hevans1944

    mmwave sensors

    What is your "product" and why does it need a millimeter wave sensor? Try this Google results page for places to look. Of course there is, but you are wasting our time with such an ill-defined request. Do you even know which mm-wave frequency you are interested in, or what bandwidth is...
  13. hevans1944

    LED Buring in

    Poppycock! LEDs either work or they don't. If they don't, there is probably something wrong with your circuit design and burning them in with a test rig isn't going to help with that. LEDs fail from excessive current. Check your design to see if the current in the LED can exceed its specified...
  14. hevans1944

    Optical Pickup

    There are a LOT of subtle issues involved in reproducing musical instruments electronically. I think, even today, the most "accurate" studio reproductions still rely on well-placed microphones, although there are acceptable transducers available for most instruments. In the end, the "proof" is...
  15. hevans1944

    circuit explanation

    Google could be your friend for this: try some of the links on this results page.
  16. hevans1944

    Optical Pickup

    I am not surprised. Both RS Components and Farnell sell components to people who already know what they are going to do with those components, and can therefore specify what they want. It would help if you were to tell us what you are trying to DO, then move on from there to possible methods of...
  17. hevans1944

    Prototype particle accelerator

    Howsabout providing some details on your "prototype particle accelerator" and why you think you need a "flyback transformer with suction cup" for your project. Forgive me for saying so, but this sounds like a typical troll post. What are your qualifications for designing, much less building, a...
  18. hevans1944

    I have a Weller W-TCP-L Soldering Station with problems

    There have been several variations on the Weller W-TCP series, but they all share the same design philosophy: a low-voltage transformer connected to a heater in series with a magnetically operated switch in the heating element. It doesn't get much simpler than that. Weller has a nice little...
  19. hevans1944

    EPROM and UV-erasing light general questions

    Congratulations on reviving EPROM technology here in the day of FLASH and FRAM memory. I too still have one of those ultraviolet lamp erasers and several EPROMs, but the programmer I have was designed to plug into an expansion slot on an IBM-PC and run a program under MS-DOS. So, not much...
  20. hevans1944

    Optical Pickup

    Well, using the Google search string "optical guitar string transducer" reveals there exists at least one patented pickup, manufactured and sold by Lightwave Systems through a guitar manufacturer, Wilcox Guitars. There are a number of You Tube videos that demonstrate these guitars. The guitars...
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