This 1 MHz oscillator was found in an Electronics World of 1969. The circuit uses a general-purpose FET and the output circuit must be resonant at the generated frequency.
The transistor for this flashlight brightness control may be the BD135. The circuit is from 1978...
This adapter circuit for measuring voltages was found in Radio Electronics from April 1966. The...
Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found...