First video on the new and improved bench!

A little project making use of leftover parts, this thermometer was directly inspired by @IMSAIGuy and his video on LM35 temperature sensors here: https://www.youtube.com/watch?v=uO0zslcKyvc

I was increasingly annoyed that I had no way to measure the outside temperature in my lab, so I decided to make a thermometer using a Mera Lumel V628 400mV digital millivoltmeter (with Nixies!), an enclosure from a gutted Elwro 5170 pH meter which became a parts donor (that's a HLY700R for V640!), a 7805 and 7905, and some odds and ends.

0:00 Intro (cat cameo appearance) 1:45 About the Project 3:28 LM35 and Schematic 5:25 Wired... 6:10 The Story So Far 8:10 Get To The Guts! 8:55 Something's Wrong... 11:25 Problem Solvin'! 13:00 Getting To The V628 16:20 A Peek Into the V628 17:40 Recombobulating 19:00 V628 Front End Schematic 20:10 Attachment Claws 20:28 Reversing the Switch (long parts skipped) 22:26 Testing 23:25 Zip Ties This Time 25:00 Body and Lava Lamp Temperature Tests 25:0 Afterword

Fridge test successful. Negative temperatures are indicated as expected.

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