# My build progress

**URL:** <https://lookmumnocomputer.discourse.group/t/my-build-progress/345>\
**Category:** DIY STUFF\
**Created:** [March 1, 2020, 8:57pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345 "2020-03-01T20:57:53Z")\
**Posts on this page:** 1\
**Showing post:** 6336

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**Author:** ![K.ostas](https://avatars.discourse-cdn.com/v4/letter/k/ed655f/32.png) [@K.ostas](https://lookmumnocomputer.discourse.group/u/K.ostas)\
**Post date:** [March 1, 2024, 8:55pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/6336 "2024-03-01T20:55:53Z")

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Almost finished a Kosmo adaptation of [David Haillant’s simple VCA](https://www.davidhaillant.com/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?

 ![20240301_224400](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/9/8/98f707e8580cc7c628dc999b7b7c795b535e72eb.jpeg)

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