The 40Hz flickering is very annoying, so i don't think someone would like to be in such a room for more then say half an hour.
That's because LEDs' light output is rectangular. The flicker of a sine light output at 40Hz would not be so noticeable. Unfortunately, driving a LED with sine wave voltage, does not produce a sine light output This is because LED's light intensity is proportional to current - not to voltage. Scope the current flowing through a LED, while driving it with a triangular voltage waveform and see for yourself. For a sine light output, a sine wave current drive would be required. This would require a rail-to-rail op-amp coupled to a CSR. If the op-amp is not powerful enough to light the LED by itself, then an additional analog output driver (e.g. an emitter follower buffer or the EL2009) would need to be inserted between the op-amp and the CSR (as in Diag.2 or Diag.3). It might also be possible to do all that with the LM317 adjustable regulator. I think I've once seen TinselKoala use this regulator in an atypical application acting as such V-->I converter + Buffer. P.S. The analog output drivers, such as: An audio amplifier, FG's direct output ...or the upcoming EL2009 buffer, all constitute variable voltage sources
« Last Edit: 2016-12-17, 10:01:00 by verpies »
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