In the figure we have the way to control a flip-flop with the 4069 from positive pulses. The circuit can be used as a shield, if powered by 5 V.
This circuit generates 500 Hz rectangular signals. The circuit is from old American documentation. Neon...
The circuit shown is a documentation on 80's tunnel diodes. The frequency depends on the delay line...
In the figure we have a small general-purpose amplifier with the LM386 integrated circuit and...