A number or readers responded to this Design Tip, some confirming its operation and happily experimenting, others suspecting that it was an early April Fools joke. Thomas Scherer one of our regular contributors put the circuit through its paces and reported on the results of his measurements as follows:rnDear Jan - I checked out a number of LEDs in my collection. The interesting conclusion is that some of them work, some don't, and some are excellent. In my tests, the blue LEDs gave the worst results. With the other colours, I measured anything from 0.5 V to nothing. Even some of the white LEDs generated around 120 mV. The best results were obtained with red, green or yellow LEDs with clear, colourless packages.
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