Thes I use for testing inductors, opto’s, voltage regulators (78xx, 79xx and LM317), SRC’s and some are just fixtures to hold a component.
Thes are used to test components on my curvetracer. The short cables have female header connectors and are ideal sockets for things like TO220 parts. The 2 big pcbs on the right are for the curevtracer. They have 5 banana plugs. The top one is for relais testing. The two left ones are for IC’s and relais.
You see a small fixture in the most left foam. That is a adapter for smd IC’s. Instead of soldering I made a small clamp out of pcb to press the IC to the board.
Shunts to measure current and a load