This circuit is from an old American documentation using as indicators for the flip-flops neon lamps. This way, the circuit has two supply voltages.
This voltage regulator for automotive use was found in a Radio Electronics from the 80s. The Q3...
This circuit uses a transistor as noise source and a 741 IC as amplifier, sourcing a high...
This circuit is from an 80's documentation, applying to ordinary comparators. The source does not...