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  1. hevans1944

    Trying to match an old terminal block

    Excellent photo! It appears that the spacing (pitch) between terminals is about 0.75 inches, but you would need to actually measure that with a pair of calipers. I could not find a barrier strip with that terminal spacing, and the mounting bosses on each end are somewhat unique. However, this...
  2. hevans1944

    Found problem in Kenwood KR-V95R

    Wow! That's the very first step most of us here at Electronics Point take when troubleshooting "dead" electronics. But visual inspection must now always be followed by electrical testing, lest the troubleshooter waste expensive time and money replacing parts that don't need replacing. Hot melt...
  3. hevans1944

    Trying to match an old terminal block

    No, it is not what I intended, but I don't know what happened. There were two versions of the post I was trying to make, one being an earlier draft version than the other. I have no idea why two versions appeared. I tried to delete only the earlier draft version but both versions disappeared. I...
  4. hevans1944

    Trying to match an old terminal block

    Since the new owners took over the site, it has become more difficult to upload pictures, especially pictures with a large number of pixels. It seems the "optimum" size is something about 100,000 pixels or less in size. The question then is what software do you use to decimate your photo to fit...
  5. hevans1944

    I think I'm starting a collection

    Very informative link you provided. But, just being old equipment does not qualify it as a boat anchor. The old equipment must also be heavy (like a boat anchor) from being made of one or more large transformers and a steel chassis. If you can lift it using one arm, it probably doesn't qualify...
  6. hevans1944

    Coronavirus transmission prevention device.

    Here in the States we are probably "saved" because President Donald Trump has anointed... er, appointed... Vice President Mike Pence to head up our national effort to find, contain, and eradicate the virus, using science and the best available scientific minds... or whatever else works. Possibly...
  7. hevans1944

    Coronavirus transmission prevention device.

    Perhaps the most effective preventive measure an individual can take is simply avoidance: avoid people, places, and things where the virus hangs out. Limit physical contact with the public as much as possible. Avoid public transportation. Don't mingle in crowds. Watch games on television or...
  8. hevans1944

    Doubts battery operation and power of the Chinese plasma pen

    @(*steve*), in a previous thread by the same OP, which @davenn eventually terminated because it wasn't going anywhere and the OP appeared not to respond to our comments, the "problem" seemed to revolve around how to determine whether the internal battery was charged or not. Since the battery had...
  9. hevans1944

    Input impedance of if and rf amplifier

    That was less than helpful. Is this homework? Your so-called schematic is incomplete. It appears to be part of a text book page explaining one method of inserting an Automatic Gain Control (AGC) into a receiver circuit. How does any of this relate to your original question concerning "dynamic...
  10. hevans1944

    Doubts battery operation and power of the Chinese plasma pen

    Youse guys do an outstanding (and probably underpaid) job of moderating this forum. I do think @(*steve*) is the most "laid back" moderator though. Plus, Steve has a knack for finding and posting good photos of really interesting, vintage, electronic toys and then restoring them to "like new"...
  11. hevans1944

    Coronavirus transmission prevention device.

    I remember drive-in movies from the '50s. Dad and mom would ask me and my brother to lie down on the floor and they would cover us with blankets to avoid having to pay for our admittance. After the movie started, both of us usually fell asleep before the movie ended, especially if it was a...
  12. hevans1944

    555 timer ?

    It would help us immensely in suggesting a solution to your "300 volt" problem if you would tell us what you are trying to DO. Do you have a circuit diagram that would do what you want to do IF a "555-type" timer were available in a 300 volt version? Sometimes all it takes is an LED-driven...
  13. hevans1944

    Coronavirus transmission prevention device.

    I have often complained, sometimes loudly while boarding, that commercial air travel is akin to transportation by cattle car. Moooooo! Said loudly after boarding. I observe now it is also a flying incubator of disease. I will NEVER voluntarily fly in a commercial airliner again. My wife and I...
  14. hevans1944

    Doubts battery operation and power of the Chinese plasma pen

    Oh, has @gamer87 from Brazil started up his merry-go-'round again? Pardon me if I choose not to ride this one out. I do wonder though if @davenn will allow this thread to ramble on for six pages and more than a hundred posts while @gamer87 ignores our responses and keeps asking the same...
  15. hevans1944

    Mix2052 audio chip

    This Class D Chinese amplifier apparently creates a differential (bridged?) pulse-width modulated output with a free-running frequency of about 130 kHz. The rate at which this PWM output changes duty cycle is a function of the frequency of the input signal. The amount of duty cycle variation of...
  16. hevans1944

    Input impedance of if and rf amplifier

    Please post a schematic diagram of the IF amplifier you are concerned with. If IF transformers are involved, specify their parameters. Is this a solid-state IF amplifier or a vacuum tube IF amplifier? Virtually all IF amplifiers ARE rf amplifiers tuned to a specific "center frequency" (the...
  17. hevans1944

    Instructables...now and then

    Instructables is mainly a source of ideas for me. I get regular email updates from the site, but so far have not been tempted to try to build anything. The project that @Bluejets linked to is waaay beyond my level of competence, but it sure looks like that guy is gonna have one happy son...
  18. hevans1944

    Missing resistor in a voltage divider network

    @Bish70: Always remember (at least) these two things: (1) Never stop learning and (2) Always endeavor to have FUN. Electronics is supposed to be fun. Lifelong learning is a habit with its own rewards.
  19. hevans1944

    Coronavirus transmission prevention device.

    Thanks, @Martaine2005, but drinking beer is NOT a vice! You go ahead an enjoy those Coronas (in moderation) with or without a slice of lime. I like to drink the Pauli Girl brand of non-alcoholic beer, since I quit consuming adult beverages in 1989. Quitting alcohol did wonders for my liver...
  20. hevans1944

    Coronavirus transmission prevention device.

    The link the OP posted was a blurb describing an RF-ID device, to be worn by an Alzheimer victim to sound an alarm if the RF-ID reader, installed in a doorway leading outdoors, was triggered by the Alzheimer "patient" attempting to escape confinement. So not exactly a Twilight Zone thread...
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