This circuit from a 1967 documentation generates 2.5 Hz signals depending on the capacitors used, in this case 160 uF. For 4 6700 pF the signal will be 20 kHz.
This circuit is old, from an English publication from 1979, so the indicated sensor is no longer...
This solid-state relay circuit (SSR) or shield is from a 1995 Electronics Now. With it we can...
Found in a 90s Motorola documentation, this circuit makes it a PUT. This component is not very...