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  1. hevans1944

    Where to get shorting strap for terminal posts

    Try this page and click on the "buy" basket icon to see price from each vendor. The part is expensive, more than three bux for each piece. Some vendors will sell you just one, but most of the time they want to sell you ten.
  2. hevans1944

    Figured I'd say hi

    Clearly, much more investigation is required before jumping into any sort of multiplexed, single-channel, duplex communication scheme. You are absolutely correct in your observations about propagation through vegetation, such as trees, being affected by frequency. I had not considered that a...
  3. hevans1944

    Figured I'd say hi

    Careful! You are gonna make me an addicted RC UAV flight enthusiast before my first drop of hot glue has congealed! But it's a nice mess to be in, given the current state of technology. No one needs to be on the bleeding edge anymore, either. Thousands of hungry but well-educated Asian engineers...
  4. hevans1944

    Figured I'd say hi

    Absolutely good advice! And thanks for the two Flitetest links. A Technician-class ham license could provide you with an overwhelming advantage in radio control, but 72 MHz is outside the amateur radio spectrum allocation. Other amateur radio band possibilities are 6 meters (50.1 to 54.0 MHz)...
  5. hevans1944

    Figured I'd say hi

    Thanks. It may be awhile. I was out of ham radio and "off the air" from 1967 (when my non-renewable Novice license expired) until April 1, 2013 when my Amateur Extra license, call sign AC8NS, was issued by the FCC. I half-jokingly say the "NS" part of my call sign means "No Station," but that...
  6. hevans1944

    Figured I'd say hi

    @VenomBallistics, thank you for the informative reply. I didn't want to hijack your introduction thread, but it appears from some of your other posts that you have considerable knowledge and experience vis a vis RC flying machines, so I just waded on in... Years ago, about 1958 or so in the...
  7. hevans1944

    Figured I'd say hi

    Welcome to EP @VenomBallistics. Looking forward to your posts here. Is the vignetting of the aerial image in your avatar deliberate, or just a result of how you had to mount the camera? I am looking into either purchasing an inexpensive drone to take aerial photographs of my property here in...
  8. hevans1944

    hi fellow hobbyists.. ?about sensors

    After reviewing the OP's requirements for a proximity sensor, I would not recommend a PIR sensor for such an application. PIR sensors rely on the movement of objects with contrasting infrared emission, compared to the background infrared emission, and have zero range discrimination. PIR sensors...
  9. hevans1944

    activate one coil in press, and the other in second press

    Read the datasheet for the D-type flip-flop that was suggested. The flip-flop changes states on each rising edge of the clock input, i.e., each time the switch is pressed. It is the connection of the /Q output to the D input that causes the flip-flop to change states. The AND gates steer...
  10. hevans1944

    I have a red LED that doesn't light up

    They (for some unspecified reason) want to test the LED without it's plastic envelop/lens. So they de-capped it, but the strain induced by that operation broke one of the wire bonds to the LED die. Or, the packaged LED could have been defective "as received," and they just wanted to get a better...
  11. hevans1944

    I have a red LED that doesn't light up

    A "possible reason"? If you want to "analyze" LEDs, you should purchase bare (un-packaged) dies and probe these with micro-adjustable wire test leads. No need to worry about cracking "welded silver paste" (or whatever) if you analyze the LEDs in that manner. All the "big boy" semiconductor...
  12. hevans1944

    Power inverter for car?

    We aren't saying that at all. Cell phone chargers, producing an ampere or two at five volts, are worth buying to keep your cell phone charged while it is being used as a GPS navigator on long trips. There are other low-current applications such a portable spot-lights, tire inflation compressors...
  13. hevans1944

    Control Electric fan through Wireless Temperature Sensor

    Any schematics, wiring diagrams, or electrical information regarding the "Electric fan power supply which is directly connected with Electric switch" would be of inestimable value in determining how to interface with the Wireless temperature sensor with Arduino. Please provide more information...
  14. hevans1944

    I have a red LED that doesn't light up

    Did you de-cap the plastic lens to expose the LED chip, as shown in the image you uploaded in post #3? If so, why would you do that instead of just replacing the "defective" LED? WTF is going on here? The chip wire-bonds (welds) might have broken because of the stress applied to de-cap the...
  15. hevans1944

    Self-Burnt CD problem

    Didn't "thumb drives" (memory sticks) replace CD-ROMs and DVDs as re-writable storage devices some time ago? The cost of thumb drives has plummeted recently, 16 Gb drives going for less than five bux. IIRC, the maximum capacity of a CD is around 700 Mbytes and single-layer DVDs are only 4.7...
  16. hevans1944

    Electronic Circuit error

    Nah. The OP claims, in post #29, that the problem is fixed. No further "troubleshooting" is necessary, so no need for a schematic at this late date. Besides, a schematic (of sorts) was provided in the image attached to post #10. Apparently the only thing missing from that image was the power...
  17. hevans1944

    Electronic Circuit error

    Well, all's well that ends well. Glad that you "discovered" the burnt IC and were able to "move the lower alternative on track to the right" (whatever that means). Good thing, too, that you fixed a socket in place for the IC... that makes it so much easier to change out those puppies when wiring...
  18. hevans1944

    Unable to get solenoid controlled by Arduino to work anymore

    What!? That's supposed to be a drawing of a transistor? I thought it was an end-view of a picnic table. Or mebbe one of them "peace symbol" thingies done wrong...
  19. hevans1944

    Capacitance on PIC I/O line

    This is the best overall general advice you will get regarding I/O lines. However, I/O lines on PICs have characteristics that depend on whether they are programmed as digital or as analog lines. Additional capacitance on digital I/O is almost always undesirable because it slows the rise time...
  20. hevans1944

    Electronic Circuit error

    This thread is going nowhere, possibly because of language differences, but also because of the naivety of the original poster: Gee whiz... second time you have made this circuit, eh? Did the first time not work either? You did say in an earlier post: This is a strong clue that the...
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