With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with the circuit shown in the figure. The circuit is from a 1965 Electronic Design.
This is the typical circuit of a fraction watt amplifier for a small record player or portable 70's...
In the figure we have the way to implement an adjustable active cycle oscillator using PLL 567....
The circuit below is a 1 mA current drain using a transconductance operational amplifier. The...