This circuit was obtained in a 1975 documentation. The maximum frequency depends on the diodes and the FET. Type 1N34 diodes and a FET BF245 can be used for frequencies up to 100 MHz.
In the figure we have the basic configuration of a regulator for 12 V x 1 A suggested by Motorola in...
This circuit for 1 kHz sinusoidal signals uses a common operational amplifier circuit and is...
This 800 Hz sinusoidal oscillator was found in a 1970s American documentation. The transistor...