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A comment on A dirt cheap “spectrum analyzer” with an RTL-SDR dongle. Parent comment

Re:A dirt cheap “spectrum analyzer” with an RTL-SDR dongle by cnvogel on Friday April 18, 2014 @03:30AM (#7608291)
Exactly. One diode will not turn on the transistor. Replace the two diodes with one LED, and the circuit will run the same.

One often finds LEDs used for the prose of simple voltage stabilization (often green ones @2.1V or so..)

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