# My build progress **URL:** \ **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:** 5419
**Author:** ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)\ **Post date:** [October 29, 2022, 9:08pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/5419 "2022-10-29T21:08:03Z")
For the analog version of [Vocode-O-Matic](https://lookmumnocomputer.discourse.group/t/vocoder-madness/4185/3) I needed 2 input amplifiers for a specific signal source. Because I’m planning on several different signal sources as input whose signal levels may be quite different I wanted the amplifier to have a variable gain. To then get an idea of what the output voltage will be, I thought some peak detection mechanism would maybe be handy. So I decided to reuse the [peak detector](https://lookmumnocomputer.discourse.group/t/envelope-o-matic-v0-2-aka-follow-o-matic/3171) from the envelope follower I wrote about earlier. For quite some time I’ve been looking for a nice way to reuse some level meters I salvaged from old cassette recoders. So this could lead to a nice match, I thought. Meet Level-Up-O-Matic: ![20221029_224930](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/8/d8df0ee80157e2b6d7fe4da91bb43b2f31ae63ed.jpeg) This may not be the best of pics but I wanted the light to shine through the meters. Some experimentation will show how well this works out. ![20221029_221841](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/1/d1838b8a9afb20e33da35090abc1fa1d18d773a5.jpeg) --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/my-build-progress/345)._