This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.
This circuit is from an old documentation. However, it can be mounted with modern equivalent...
Using the 723 integrated circuit, this circuit was found in an article on power supplies in the...
A low voltage heating element (up to 30 V) with a current of up to 3 A can be precisely controlled with...