This circuit is from an Electronics World of 1967. The described calculations can be applied to equivalent circuits with modern transistors.
This circuit shows how to get 5 V under low current from an operating amplifier 741. I got this...
TQP92xx series power amplifiers for frequencies in the typical range of 1,805 -2,200 MHz can be...
We find the original circuit in a technical publication of 1978. Changing the components, such as...