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  1. hevans1944

    The new types of IOT

    Remember "mood" rings? With modern electronics you could make an IOT mood ring! Great fun at parties if paired with GPS location hardware, maybe as part of a smartphone near-field link. If everyone at the party had the app on their cell phone, everyone could instantly map the "mood of the room"...
  2. hevans1944

    Question

    This activity is NOT within the purview of the FCC. There are other three-letter agencies with big antennas, sensitive receivers and spectrum analyzers, powerful mainframe networked computers, and supporting staff of language translators, crypto-analysists and black ops personnel working the...
  3. hevans1944

    Low-ESR 1uF electrolytic (hard to find)

    One microfarad, sixteen volt, dipped tantalum capacitors are quite common and relatively inexpensive. The make excellent coupling capacitors in low-frequency applications because they are tiny compared to other capacitance dielectrics, therefore occupying less precious board space. ESR is...
  4. hevans1944

    Difference between Brown out and Power on reset

    You should find that both POR and BOR bits <1:0> are set in RCON after initial power on. All other bits in RCON should have been cleared as a result of the power-on reset. As part of your program initialization after initial power on you should clear both POR and BOR bits so that the contents of...
  5. hevans1944

    Circuit board wire connectors question

    I really cannot recommend this... all sorts of things can go wrong... but you could just take a pair of scissors and cut the flexible circuit in the middle between the two soldered ends. Then carefully scrape bare the conductors on each cut end, solder onto these now bare conductors whatever...
  6. hevans1944

    Difference between Brown out and Power on reset

    This is correct. See Section 6 RESETS in the datasheet, in particular this quotation:
  7. hevans1944

    Integration of Camera in Cathode ray oscilloscope (CRO)

    One of the nice features of a dedicated oscilloscope camera mount, which is generally "light tight" to the outside world, is the ability to open the camera shutter prior to triggering the 'scope in a non-reoccurring (one-shot) sweep mode. This allows the recording of transient events, although...
  8. hevans1944

    Power-One power supply mod

    An oscilloscope is absolutely essential if you are to make any progress as an electronics hobbyist. An EICO 460K oscilloscope kit was my second purchase, as a teenager, after building an RCA Voltohmyst WV-77E VTVM (Vacuum Tube Volt Meter), also from a kit. These two instruments truly got me...
  9. hevans1944

    Power-One power supply mod

    Looks like its 60 VA per secondary winding, or 4 A at only 15 VAC. That's waay too small for a 30 V, 3A power supply. See @Audioguru post #36. Want some (more) advice? Scrap the idea of using Chinese parts or kits. Find a decent schematic for a dual-output laboratory bench power supply of...
  10. hevans1944

    Magnifying lens help needed pls.

    "Best" is relative to your purpose, in this case the ability to "see" smaller components. Whether you also need to use your hands to manipulate those components is also a consideration. I would recommend that you start with a good binocular stereo head-mounted magnifier. I use Donegan Optical's...
  11. hevans1944

    AM Transmitter from Signal Generator UDB1208

    Well, the "regulatory stuff" is important more than ever in the 21st Century, because the available spectrum is becoming extremely crowded. Back in the day (while still a teenager), I built a low-power AM broadcast band transmitter and put it "on the air" in my neighborhood, at first...
  12. hevans1944

    AM Transmitter from Signal Generator UDB1208

    The UDB1005 does not appear to have a modulation input. The TTL output is for use in "clocking" transistor-transistor-logic. Finland (being a member of the European Union) is bound by Radio Equipment and Telecommunications Terminal Equipment (R&TTE) Regulations that currently forbid unlicensed...
  13. hevans1944

    Electrostatics

    I think you have answered your own question. My question is, "Why would you want to use a rheostat to act like a solenoid?" The are completely different in form and function. Grab a handful of rheostats and an handful of solenoids. Measure the inductance and resistance of the solenoids. Measure...
  14. hevans1944

    Experimental Repair

    I would ditch the 556 and the speaker. Instead, use one of those really loud, really obnoxious, solid-state noise makers that the SPDT relay can energize directly, along with the red LED. You might also consider adding a rotating red (or yellow) alarm light for even greater effect. All that...
  15. hevans1944

    Experimental Repair

    I am reactivating this old thread since, based on your more recent posts, you still seem to be learning. Below is a picture of your Weller 260/200 Watt Soldering Gun as seen on Amazon.com The heavy "aluminum rods" protruding from the front are actually the end connections of a one-turn...
  16. hevans1944

    Antique Automotive Resistors

    OR Press to MECO on post #10.
  17. hevans1944

    Antique Automotive Resistors

    Not sure how you plan to do that, so maybe you should take your problem over to http://xs11.com where you can find a LOT of Yamaha XS1100 expertise. Then try http://xs1100.com to find the ballast resistor you need. @duke37 TCI = Transistor Controlled Ignition. An early attempt to "improve" on...
  18. hevans1944

    Please help identify this variable resistor

    Many thanks for this link! I haven't seen this extremely valuable manual for many years! My wife does not understand why I insist on keeping "obsolete" references like this around. If I don't hide them carefully, they wind up in the trash when she "tidies up" the house. :mad:
  19. hevans1944

    Salvaged components

    Every experimenter I have ever known, myself included, has done this. When I was a kid learning electronics, I never had enough money to buy new parts. Dumpster diving behind radio and TV repair shops yielded plenty of broken "stuff" from which to extract used, but viable and useful, parts...
  20. hevans1944

    Hall effect switching info needed

    Good for you! We've seen people like you before who come to this forum asking for help, but are unwilling to reveal exactly what they are doing because they lack a patent and fear that someone will steal their million dollar invention. It's happened before, with and without patents! Google...
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