Found in a 1965 Electronic Design, this circuit generates adjustable pulses between 200 uA and 10 mA. The components admit equivalents. Pulse duration is 1 us.
For reference only, this is the first IF amplifier stage of a common transistor radio from the...
This circuit from July 1975 Radio Electronics uses any operating system with a symmetrical source....
This setting is valid for other transconductance operational amplifiers. The circuit is from...