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  1. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Years ago, in the 1950s, I was briefly attracted to the fixed-wing, flying, model aircraft hobby. Back then it was all about balsa wood air-frames, and fabric-covered fuselages, wings, and control surfaces, said fabric painstakingly applied, doped, painted, and affixed with decals before the...
  2. hevans1944

    Electric ICE Exhaust Cut-out... why? and how?

    A recent thread (now closed) brought back memories of the 1960s and the Beach Boys song Little Deuce Coupe. Part of the lyrics say "she purrs like a kitten 'til the lake pipes roar ... you don't know what I got." I dug the Beach Boys songs at the time but had no idea what lake pipes were. I also...
  3. hevans1944

    Understanding basic passive components: resistors, capacitors, inductors.

    hevans1944 submitted a new resource: Understanding basic passive components: resistors, capacitors, inductors. - passive electronic components Read more about this resource...
  4. hevans1944

    Electronics for prop control

    Last year, for the first time in my life, I signed a non-compete agreement with a re-seller of magic props used by the amateur as well as the professional performing magician. These are rather expensive props imbued with modern technology. In return, I was made privy to several magic "gimmicks"...
  5. hevans1944

    How to Interface to PT4303-S Superhet Receiver Chip

    Someone posting as @PTaylor hijacked another thread on this subject, after surmising they should have opened a new thread. So, I am doing just that. Below is the original post followed by my comments: This popular Asian chip is used to receive amplitude shift keyed (ASK) or On/Off Keyed (OOK)...
  6. hevans1944

    Wi-Fi IoT using RF backscatter

    Recently someone posted a video showing an IoT (Internet of Things) device that did not require an RF transceiver to link into a local Wi-Fi network. Instead, it modulated the antenna impedance digitally with a MOSFET to utilize RF backscatter from a local, powered, wireless Wi-Fi transceiver to...
  7. hevans1944

    Safe sequencing of power

    A recent newby poster, @haqq, asked: I have a product testing line with 30 products (1KW each) plugged in at the same time and after completion of the test, all these items are plugged off at the same time. I need to automate this process i.e: Turn on all the 30 items at the same time turn off...
  8. hevans1944

    Cordless 1500 Watt Hand-held Blow Hair Dryer

    My wife's daughter is a licensed cosmetologist here in Virginia Beach. She would like the hand-held blow dryer she uses constantly every day to be sans power cord, because the cord frequently gets tangled on either the chair or the customer while the dryer is being used. So, she asked her...
  9. hevans1944

    Fail-safe shaft rotation sensor

    I have a shaft-mounted cast iron pulley with six spokes that is motor-driven with a v-belt. A Cherry GS100701 gear rotation sensor with an internal permanent magnet is mounted in a position to sense the passage of each iron spoke past the sensor head when the pulley is turning. I need a circuit...
  10. hevans1944

    Yo, World!

    I just now discovered this forum, which looks like it might be pretty interesting. I am a semi-retired electrical engineer who started off "messin' 'round" with electricity and electronics at about the age of six. Dad brought home a Lionel electric train set for Christmas that year. I didn't...
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