[time-nuts] Allan variance by sine-wave fitting
chris at chriscaudle.org
Mon Feb 26 15:59:02 EST 2018
On Mon, February 26, 2018 2:29 pm, Tom Van Baak wrote:
> BTW, a trick for blinking LED's -- use two of them out of phase: one that
> the user sees on the front panel and one that is blacked out or hidden
> inside. A flip-flop (Q and /Q) or even a set of inverters is all you need.
> The current draw thus remains constant in spite of the blinking.
You could also use a long-tail diff-pair, with the LED in the collector
circuit of just one side of the pair. Only costs one extra transistor and
a few resistors and then the current draw is (close to) constant whether
the LED is on or off.
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