Found in a 1967 EEE, this circuit oscillates at 20 MHz according to the values of the given components. The FET can be of general use. The coil has only indicated the number of turns.
In the figure we have the way to obtain a monostable TTL based on 74121. The circuit appears in...
This circuit operates at the frequency of a small transmitter up to 27 MHz, triggering a relay from...
The battery is charged by the photocell that keeps the low consumption beacon in the dark. The...