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What ever happened to Watt Sun anyway?...
Inspired by, hmm, what the hell compelled me to do this anyway? -- I made
one of those 1.5V to white LED inverter dealies. I found some exceptionally small RF toroids and wanted to see how it would go. Having not done this before, I started with larger toroids, which went very nicely. This small piece has (understandably) little inductance, so it took three times as many turns as the earlier coils, and still the operating frequency ended up at a whopping 5MHz. The LEDs still light up just fine. They don't seem to mind what the frequency is. Circuit is (in order): a 0.1uF ceramic cap (the yellow box), a 2N4401 wired as blocking oscillator (though the blockingness at this frequency is debatable!), the coil (15T each of around 26AWG, one in series with the collector and LEDs, and the other in series with the base), and two white LEDs, claimed as 1100 mcd on the RadioShank bubble package they came in. Output seems to be limited by voltage and peak saturation current, which in all cases peaked out at 600-800mA. Collector saturation seems to be in the 0.3V range, which is probably in part due to the large peak base current possible here. I'm not counting efficiency at the moment, so what the hell do I care. ;-) Tim -- Deep Fryer: A very philosophical monk. Website @ http://webpages.charter.net/dawill/tmoranwms |
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