<div dir="ltr"><div>Hi List,</div><div><br></div><div> Well, it's my browser's bookmarks time to shine!<br></div><div><br></div><div>I have noted in the past that a few Synth people have experimented with flickering LEDs.</div><div><br></div><div><a href="https://cpldcpu.wordpress.com/2013/12/08/hacking-a-candleflicker-led/">https://cpldcpu.wordpress.com/2013/12/08/hacking-a-candleflicker-led/</a></div><div>This has some statistical analysis on the duty cycles of the flashing LED they tested</div><div><br></div><div><a href="https://www.evilmadscientist.com/2011/does-this-led-sound-funny-to-you/">https://www.evilmadscientist.com/2011/does-this-led-sound-funny-to-you/</a></div><div>This has a circuit that uses one flashing LED's current draw to switch a transistor to make a non flashing LED flash in sympathy with the flashing LED.</div><div><br></div><div>And the Razmasynth has a flicker LED module</div><div><a href="https://futurevector.eu/super-warp-generator/">https://futurevector.eu/super-warp-generator/</a></div><div>The page no longer has the schematic, but I seem to recall it's just the LED and current limiting resistors?</div><div>Maybe a small cap on the input of the LED to smooth out super glitchy inputs.<br></div><div><br></div><div>/Edward<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 12 Jun 2024 at 01:02, loss via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I am building a small motor based "BUG" robot with my son. One of the parts the project calls for i have never seen before..a flashing led or fLED<div><br><div>The text says that if you use a regular led the motor will not work properly (it must somehow be using the FLED as a timer which allows current to flow from the storage capacitors</div><div>to the motor. The text gives no further explanation but it does reference it as a timing element. Later projects use a hard to obtain part called the 1381 trigger but i would rather use parts I have on hand. </div></div><div><br></div><div><br></div><div><br></div><div>Obviously I could order an FLED but as the datasheets are very sparse I was wondering if anyone has any idea internally how these parts work. Where does the timing mechanism come from?</div><div>I was wondering if even though they are a two leg device..that internally they may have similarities with PUT or UJTS. I have a whole bunch of PUTS around.</div><div><br></div><div>thanks!</div></div>
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