Brian is the one who wrote the ESP8266 Youtube library that I used in the Nixie Tube Sub Counter video series. Here he is showing you all sorts of cool libraries for the ESP8266 module in this guest video. Check out Brian’s channel HERE

Scott from the The Defpom channel troubleshoots a Fluke Calibrator Check out his channel HERE

In this guest video, Florin from the Voltlog channel with his InTheMail segment reviews some cheap useful tools and gadgets from Ebay, Aliexpress and Banggood. Check out his channel HERE Forum HERE

In this guest video Bob DuHamel from RSD Academy does a follow-up to my opamp tutorial video explaining with a neat visual aid how the virtual ground on an inverting opamp works. Check out his channel HERE and subscribe Forum HERE

In this guest video Tony Goodhew from TGsoapbox demonstrates how to calculator RF crystal detector sensitivity. Check out his channel and subscribe HERE