Almost finished a Kosmo adaptation of David Haillant’s simple VCA. Before I put the LM13700 in the socket, however, I did a little measurement at the test points at the bottom of the PCB. Everything fine. I pop in the IC, turn on the power, all fine. I plug in an input, an output, then a CV input… I get a fuse blown. A change of fuse and another try. This time I wait a little before I plug in the CV… and I smell of burning plastic. I turn off the power and I notice that the ceramic bypass capacitor at the negative supply of the IC has been damaged. Fake LM13700? I got them from “you know where” cheaply. I also got another one, not so cheaply, from a local shop. Any advice other than replacing the capacitor before I try the other IC that I have?
