This circuit for currents from 500 mA to 1.5 A was found on a Ham Radio from the 90s. R4 determines the current in the load under test. Transistors must be equipped with radiators.
This circuit is from old documentation. The operational amplifier is uncommon nowadays. The...
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...