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  1. hevans1944

    EAS 8.2 MHz antenna design help needed

    The RF-ID passive soft-tag resonates when exposed to the RF probing field. This resonant energy absorption can be detected and used to signal that the presense of a RF-ID soft-tag has been detected. It does not, in general, provide any location information of the RF-ID soft-tag, other than the...
  2. hevans1944

    analogue perceptron

    Those clever folks in Silicon Valley, California, and Texas came to the same conclusion. So they created SPICE (Simulation Program with Integrated Circuit Emphasis) software to better understand their integrated circuitry before performing the expensive tape-out required to manufacture the real...
  3. hevans1944

    Home Based Income as an Electronics Hobbyist

    If it involves electronics, a Maker who "throws together" a project from modules is building electronics projects. Who cares if the Maker knows diddly about the theory, or soldered together components common to most electrical circuits? If the end result works, is useful, it will be successful...
  4. hevans1944

    analogue perceptron

    The above quote (edited) from your post #12, and the attached YouTube video in that post, provides a good example for you to follow, @dragon. Note in particular her use of real parts and real test equipment to test out her breadboard demonstration. Not a simulator anywhere in sight! Maybe it's...
  5. hevans1944

    Home Based Income as an Electronics Hobbyist

    Why? It is threads like these that attract new "customers" to the site. Always follow the money! Hmmm. Maybe the owners, or one of the moderators, can change the title of this thread to Creative Discussion of Avatars... and move it to another forum. Here is an idea for making a side income...
  6. hevans1944

    Charging for a laptop

    This page, which can also be found at the website of the link provided by @Harald Kapp in his post #2 above, offers a power bank with several barrel connectors. You might want to visit the website of this vendor to find out if what they offer will work for you.
  7. hevans1944

    XR2006-Sawtooth Amplitude Control

    Dana is a pretty clever engineer, but this site does welcome all visitors (who write in English). Because there are so many international participants here, each with their own perception of who made the Universe and what our purpose (if any) in it is, it does appear that most posters here avoid...
  8. hevans1944

    Any fm transmitter circuit with 2 pin 32.768mhz clock oscilator?

    If your crystal is mounted inside a small metal tube marked "32.768" it is probably a clock crystal, commonly found in watches and "quartz" time pieces. It resonates at 32,768 Hz. Note that this frequency is nowhere near 32.768 MHz. In America, the FM broadcast band frequencies are 88 MHz to...
  9. hevans1944

    treble control centre frequency

    I was commenting on the inability of real filters to create a "brick wall" type of transition in frequency response. The problem occurs whenever the desired frequency response has a non-differentiable segment, which also includes any discontinuous jump in frequency response as well as "sharp"...
  10. hevans1944

    Just Me

    I'm a wannabe "80-something," trying to remember why I am here... just waiting for my 79th birthday next year... hopefully. Welcome to Electronics Point... er, Maker Pro. What experience do you have with hobby electronics? This is a friendly and (mostly) knowledgeable international community...
  11. hevans1944

    Merry Christmas

    @Kiwi and @davenn: Yes, it is quite cold in North America, even here in southwestern Florida, although we did not freeze and did not have a "white Christmas" like all the states north of us, and all of Canada too. Lots of folks stranded at airports and on the roads, making Holiday travel a...
  12. hevans1944

    treble control centre frequency

    The sharp corners at 5k are not physically realizable for reasons I won't go into here. Not even with digital filtering, FIR nor IIR, is this possible. You will discover something called Gibb's Phenomenon if you actually attempt to create such a filter. Try using a circuit simulator as @danadak...
  13. hevans1944

    treble control centre frequency

    @danadak: Thank you for all of your most informative posts on this and other topics. I was wondering where all the "young pros" like you were hanging out. This thread is especially helpful in that it shows a very helpful benefit to using a circuit simulator to perform "what if" substitution of...
  14. hevans1944

    How ro work that radio chip?

    Google could be your friend... try this link. Or maybe this one. Or even this one...
  15. hevans1944

    Can you discern the circuit ?

    @Externet's link initially brings up a breadboard image with two (alleged) "air-coupled" molded inductors, but wait! There's more! Scroll left to this page and you see the original jewel thief circuit that uses two closely coupled (bifilar wound) windings on a toroidal core driving a red LED...
  16. hevans1944

    Looking for a specific light-activated switch (12V DC)

    I once worked with an engineer whose office was located some distance from the laboratory where he normally worked, often late into the evening. His wife would call his office phone but he wasn't there to answer it, so he needed some means to notify himself in the lab when his office phone was...
  17. hevans1944

    Can I replace a brown ceramic capacitor with blue ceramic?

    Oops. It's marked 2KV, not 4KV. That's still a lot of voltage to place between those two closely spaced leads.
  18. hevans1944

    Can I replace a brown ceramic capacitor with blue ceramic?

    That blue one appears to be rated for four kilo-volts, although I don't see how it could reliably hold off that much voltage given the small distance between its two leads. The other two capacitors surely are not rated for such high voltage. Could the blue one and the yellow one be dipped mica...
  19. hevans1944

    Samsung smart tv black screen of death

    Our Sony Bravia oled flat-screen "smart" TV in the living room sometimes refuses to stream Amazon Prime video, while at the same time allowing streaming of other "channels" such as YouTube or Disney+ over our broadband Internet connection. Resetting our wireless router, either by unplugging it...
  20. hevans1944

    Meaning of square symbol ?

    Huh? Whazzat? I learned about Euclidean Geometry in high school, and non-Euclidean Geometry in college, but wtf is Sacred Geometry and who says its sacred? Does this have anything at all to do with religious faith or electronics? Oh, yeah... and welcome to Electronics Point... er, Maker Pro...
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