- The pull-down current from 74HC is enough to drive superbright LEDs
nicely even at a 10:1 multiplex ratio. I could have eliminated 60% of
the SMT on the board :(
- eBay is a great source of cheap LEDs, but expect a few early-life
failures due to inadequate factory testing.
I have four more PCBs. Time for a 20x20 display....
Re: model lighting ...LEDs aren't hard to work with. ... 25W RadioShack soldering iron will work fine enough. ... becuause my standards of soldering (I work in electronics as a professional) ... Resistors are dirt cheap when you buy them from the right places - ... (rec.models.railroad)
Re: Next Genration Pinball Design ...cheap second grade components, this is because of the redundant nature ... of 30 odd leds and a couple a broken ones will not impede its ability ... layout to a certain degree (the lamp transistor for the shoot again is ... the lamp drive matrix for an led based ... (rec.games.pinball)
Re: suggestions for red light ... I wonder how many of us have made our own red lights by putting theater gel or some other red membrane over the lens of a normal flashlight.... These days with LEDs so cheap it is easy enough to convert any of the tiny cheap torches to use a deep red LED. ... Even so I find that certain cycle back lights with a particularly dark red filter make the best red flashlights. ... (sci.astro.amateur)
Re: Whats wrong with LEDs for bias? ... >> triode gain stage based on a 5610. ...Fixed bias, though it gives better bass, to the golden ... > LEDs are sometimes used elsewhere, though not by the hardcore faithful. ... > the untrafidelista DIYers because they are obsessively cheap,... (rec.audio.tubes)
Re: LED Business Sign ... >>I want to build a business sign for my wife's flower shop business.... > Enough LEDs will not be cheap. ... filter behind it and a cheap tube light.... (sci.electronics.design)
