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  1. KJ6EAD

    Appropriate power supply for 3 LEDs

    There is a resource here on the site to help as well which includes illustrations and schematics. https://www.electronicspoint.com/resources/got-a-question-about-driving-leds.5/
  2. KJ6EAD

    I'm looking for 12v. LED's in red and yellow that cast light like a regular bulb.

    What size and form? How bright?
  3. KJ6EAD

    Low end, how to work with flicker LEDs on 1.5v

    They don't supply 1.5V to the LEDs. They have a boost circuit that raises the voltage to what the LEDs need. Often, the battery has a nominal voltage less than 1.5 since they are typically NiMh or NiCd technology.
  4. KJ6EAD

    Low end, how to work with flicker LEDs on 1.5v

    You want something designed to run on 3V to run on 1.5V but you want the answer to be simple. Okay, no, it won't. Different circuit; different parameters. Here's the complete, non-simplified answer: Specialty LEDs with on board circuitry to control flicker may require either a fixed voltage or...
  5. KJ6EAD

    Crimp, Bullet, Shur connector: TE Connectivity

    The connector profile is round. The base or bottom die is curved but not as curved as the connector. While it's a given that the crimping operation changes the shape of the top part of the connector; most notably the wings or ears are curled and compressed, it's also true that the bottom of the...
  6. KJ6EAD

    Crimp, Bullet, Shur connector: TE Connectivity

    It's trial and examine for proper form and pullout strength on the conductor crimp. The bottom of the die on the tool is curved in a larger radius than your connector would like so you need to select a well that the connector fits into but wedges above the bottom. The connector will be forced...
  7. KJ6EAD

    Unknown soldering device needed

    The usual solution to connect wires to a PCB without a connector is a terminal. Take a look at the ones in this search that have a 2.54mm (0.1") pitch as they'll fit your protoboard. You can bus your terminals together with jumpers on the PCB or in the terminals themselves.
  8. KJ6EAD

    Unknown soldering device needed

    It's a header. The short side solders to a PCB and the long side usually goes to a female connector. You will not have good results trying to solder wires to it. If you try, the plastic part will melt, the solder on the PCB will melt and the pins will topple over.
  9. KJ6EAD

    Crimp, Bullet, Shur connector: TE Connectivity

    Those require an open barrel crimp known as an F crimp. There are several ratcheting crimp frames made by Greenlee that will accept open barrel crimp dies. The combination of a Greenlee PA8000 frame and 10877 die runs around $100. Molex makes a non-ratcheting universal F crimp tool that goes for...
  10. KJ6EAD

    Converting astrocom ground cord for use on David Clarke headset

    You've only shown us information on the Astrocom half of the problem. Unless you show us the David Clarke side or someone here happens to be an expert, this is not enough. As an aside, headset manufacturers often offer for sale, at exorbitant prices, adapters to various other systems.
  11. KJ6EAD

    Trying to figure out the MC34063A buck converter

    The MC34063A is fairly ubiquitous in cheap car USB power supplies so if you just want one that works, there you go. I have it on good authority that this IC is not as efficient as some later models. There have been many prior threads discussing it. Please review them then come back...
  12. KJ6EAD

    Converting astrocom ground cord for use on David Clarke headset

    Do you have reason to believe they're wire to wire compatible without any additional electronics?
  13. KJ6EAD

    Identify this continuously rotating part please

    It's a mechanical incremental rotary encoder. They can be had for as little as $7 new. It has 24 detents and is a PCB mount type. The resolution is unknown. TTC is a Chinese manufacturer. If there's no model number, you probably could only source from the OEM (maker of the oven) or by parameter.
  14. KJ6EAD

    Visible light

    Yes, but a single antenna will be less than 1μm long. The light sources we're familiar with contain vast quantities of optical antennas. https://www.photonics.ethz.ch/en/general-information/research/optical-antennas.html
  15. KJ6EAD

    Help!

    The presence of a Mrs. disproves the assertion in the original post therefore sarcasm must have been intended. ;) Wisdom. :cool:
  16. KJ6EAD

    Book: Transistor Circuit Design, With Experiments, by Delton T. Horn

    Textbooks are a good option to avoid high error rates as they go through frequent updates, mostly for cynical profiteering reasons, but with the positive side-effect of getting the errors wrung out after several editions.
  17. KJ6EAD

    Public Signaling

    PMR isn't a thing in the US. Here the comparable UHF allocations are FRS or GMRS. We also have MURS in the VHF spectrum and LMRS in both VHF and UHF. If you're interested in buying rather than building, GAMA makes and sells RF remote control systems at reasonable prices...
  18. KJ6EAD

    Public Signaling

    Various frequencies are designated as ISM (industry, science and medical) which are the ones likely to be legal for your application. Would a repurposed and slightly modified inexpensive wireless doorbell system work?
  19. KJ6EAD

    How do I figure out what is jamming the RF signal in my garage

    If it's a remote control for a garage door opener, make sure the antenna wire on the unit is intact and hanging straight down. It's helpful on this forum if you state specific brands and model numbers where possible.
  20. KJ6EAD

    Having trouble building circuit?

    Turn the ICs right side up on the breadboard (pin 1 on the left). I can't look at it now.
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