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  1. KJ6EAD

    Led flashlight question

    The multiple modes with one button suggests the presence of a microcontroller and either a current regulating circuit or more likely a simple PWM drive. Your chances of successfully modifying it to your purpose without destroying it are small. Just buy a Fenix PD35, 960 Lumens for $70. It has 6...
  2. KJ6EAD

    PCB Prototype solderless breadboard questions

    Most breadboard modules are, as the term implies, modular. They have dovetail joints on the edges to allow them to be panelized and mount in a mutually supporting way. They have screw bosses molded into the back which allows firm connection to a substrate such as plastic or metal from the bottom...
  3. KJ6EAD

    Powering a mobile FM transmitter

    Good catch; thanks; fixed in post and added a happy note.
  4. KJ6EAD

    Powering a mobile FM transmitter

    Your transmitter can be set to 1W output and that will be more than enough. Use an automotive-style whip antenna instead of the included telescoping one which is not suitable for mobile use. There is a user review for your transmitter that warns of a pre-emphasis mismatch as the CZE-7C is...
  5. KJ6EAD

    Daisy Chain 3AAA LED Candles Help Please? !

    You want to supply 4.5V to each in parallel, not "daisy chain" them which is a series configuration. You may be able to run all of them from a 5V 1A supply such as a "dumb" USB charger block. Since you've not supplied any current draw or voltage tolerance information, which I'm sure you don't...
  6. KJ6EAD

    Ack. Thing I fried something. Noob project help.

    You probably need a 12V or possibly 24V DC power supply but there's more going on in that circuitry than what the correct power supply will solve. I noticed a diode and what looked like a solid state device, possibly a TO-3 transistor case. The device you blew up was probably a blinker circuit...
  7. KJ6EAD

    Can I cut/split a pcb into half, then solder the traces back together?

    Indeed; there are probably at least two layers you can't see. There are roll-up keyboards available and there used to be a folding model called a VAX77. http://www.infiniteresponse.com
  8. KJ6EAD

    Traffic light sequencer

    The schematic for the Velleman MK131 Traffic Light kit uses the pattern you want. http://www.velleman.eu/downloads/0/minikits/manuals/manual_mk131.pdf LED colors (Red, Yellow, Green)/directions (North, East, South, West) map as follows: LD1, G/S; LD2, G/N; LD3, G/W; LD4, G/E; LD5, Y/N; LD6...
  9. KJ6EAD

    where do you get your "stuff?"

    We have a resource, started by Kris Heidenstrom before his passing. https://www.electronicspoint.com/resources/component-suppliers.34/
  10. KJ6EAD

    How do I figure out these resistors?

    I count 10 question marks. Would you care to focus on one?
  11. KJ6EAD

    Scary...

    The "wheat and chaff" problem with using the internet as a resource can only be overcome by the application of critical thinking. Unfortunately, most of the "express elevator" types have not acquired this life skill.
  12. KJ6EAD

    Sound to light unit

    Evie, I recognize this is the schematic from the Velleman MK103. Are you intending to build on the kit PCB or design your own?
  13. KJ6EAD

    Defective PCB/scroll saw

    In accordance with the Chenglish writings of Dr. Edd above, likely point(s) of failure are triac and/or optocoupler.
  14. KJ6EAD

    Need Datasheets for TI SNN76477N or SN76488N chips

    BG Micro was the last U.S. source I know of. Their website still has some supporting documents. http://docs.bgmicro.com/pdf/ics76477a.pdf There is a Wikipedia article for the chip that includes a clean redraw of the feature demonstrator. https://en.m.wikipedia.org/wiki/SN76477
  15. KJ6EAD

    Need Datasheets for TI SNN76477N or SN76488N chips

    There's a pinout in Google images.
  16. KJ6EAD

    Phone with two ear phone sockets

    I've used something like this for many years. http://www.amazon.com/Monster-MusicShare-Headphone-Adapter-Smartphone/dp/B00GX6B1XU Because of the difference between various headphones, earbuds and listeners, there's a little procedure for using the splitter effectively: 1. All connections...
  17. KJ6EAD

    Synth projects out there ?

    I don't know. I guess analog is a kind of infinite bit width. http://www.musicfromouterspace.com http://buildasynth.josephfosco.com http://www.paia.com/ http://www.till.com/articles/synthresources/ http://yusynth.net/index_en.php http://home.comcast.net/~ijfritz/sy_over.htm
  18. KJ6EAD

    Help with identification.

    It's unlikely that the damage is limited to one component. I've repaired many lightning damaged boards where the surge was conducted in on an ethernet cable and even without visible damage, multiple components had to be replaced to make the units operational. That left open the question of...
  19. KJ6EAD

    can I use this wire?

    Yes, at least it's stranded copper so it'll have some flexibility, but it's far from ideal. Although the gauge is easily capable of the current, often in cases like this where mechanical strength is paramount, it's best to use the largest wire than can reasonably fit the connections and keep the...
  20. KJ6EAD

    Ideas for light control on 12v music system

    If you search the terms "sound to light" and "color organ" you'll find plenty of schematics and kits. There are also many LED strip controllers that have a sound reactive mode.
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