This low frequency oscillator circuit was found in an Electronic Design from the 90s. The transistors are common types, and the frequency is given by the crystal.
We found this amplifier circuit for inductive audio pickups in a documentation from the 70s. The...
The circuit is from Motorola's Linear Databook from 1990, but the configuration is current because...
This 6-transistor commercial radio with 6 V supply was found in a Japanese publication from the...