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Beginners / Need a (slightly) random signal ? Hers an idea, using CDS light sensor.
« Last post by RJSV on Today at 01:59:33 am » Hello there!
After purchasing one of those cheap 'Garden Lamps' it was amusing to watch and contemplate the 'flicker' signal that gets generated. It's a slow candle-like effect, that COULD be useful as an optical signal source...in this case as an informal signal gen.
Simply couple your extra CDS sensor, that will be round, with glass front, and, usually, some visible track line grid. I've found the sensor is good when placed as a replacement for single resistor, like in some 555 or Lm311, or Lm339 type oscillator circuit.
The sensor usually is in range of about 500 ohms, so when putting in place of, say, 10 kohms, best to put about a 3k to 5 k in series, so you get around 10k, but with variations, according to light levels.
The solar device LED, (I've assumed) is made to flicker, by some simple processor.
OMG, ...?? Are the light flickers generated inside the output LED, itself ?
In that case would need to put simple current monitor and LM324 OPAMP buffer, to follow the small current fluctuations.
After purchasing one of those cheap 'Garden Lamps' it was amusing to watch and contemplate the 'flicker' signal that gets generated. It's a slow candle-like effect, that COULD be useful as an optical signal source...in this case as an informal signal gen.
Simply couple your extra CDS sensor, that will be round, with glass front, and, usually, some visible track line grid. I've found the sensor is good when placed as a replacement for single resistor, like in some 555 or Lm311, or Lm339 type oscillator circuit.
The sensor usually is in range of about 500 ohms, so when putting in place of, say, 10 kohms, best to put about a 3k to 5 k in series, so you get around 10k, but with variations, according to light levels.
The solar device LED, (I've assumed) is made to flicker, by some simple processor.
OMG, ...?? Are the light flickers generated inside the output LED, itself ?
In that case would need to put simple current monitor and LM324 OPAMP buffer, to follow the small current fluctuations.