links for 2007-10-30
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if we are only interested in knowing when and for how long our signal of interest is above some threshold, we could use transistors to produce a circuit with an output voltage that is high or “on” when its input signal is above a “turn on” threshold a
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Sometimes an input signal to a digital circuit doesn’t directly fit the description of a digital signal. For various reasons it may have slow rise and/or fall times, or may have acquired some noise that could be sensed by further circuitry. It may even be
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This is basically a Schmitt Trigger circuit which receives input from a cadmium sulfide photo cell and controls a relay that can be used to switch off and on a street lamp at dawn and dusk. I have built the circuit with a 120 ohm/12 volt relay and monitor
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