For a current of 5A and a supply of 6 V this circuit was found in documentation from the 70s. Transistors admit modern equivalents. Q1 is a PUT uncommon today.
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...
This oscillator for sinusoidal signals uses a lamp as a stabilizing element. We found it in the...
This amplifier, for millimeters from 0 to 1 mA, was found in a 1957 Raytheon publication. The...