mystery

It's missing one alligator lead, and a lightbulb (?). The transformers are both 24v. Is this a tester of some sort? I haven't plugged it in. Thanks for your help.

Hello, I designed a PCB with 3pcs TC7660 charge pump ICs. They are going to be connected paralely to reduce output resistance. Each of them can be disconnected at the output side via jumper. I have a problem to make them working even when they are separated from another components. It seems like...