Here is the completed project
https://github.com/sinclairthe2nd/ColourDevelopmentHeater/tree/master/AVR-Straight-C
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https://www.youtube.com/watch?v=5gFZWIMW4X0
Here I start out another major Project, an STM32 based Handheld Game console with retro sound generation capabilities
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https://www.youtube.com/watch?v=ryVPxQTsCPM
Here I design a front-end for a PT-100 Restive Temperature Sensor,
It uses three op amps.
Schematic is here
https://github.com/sinclairthe2nd/ColourDevelopmentHeater/tree/master/AVR-Straight-C/ColourDeVHeater
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https://www.youtube.com/watch?v=4Gmtpqk3H-Y
Here I explain why and where to put fuses in an Amplifier,Radio or other Vacuum Tube Equipment.
Needles to say that you are doing all of this at your own Risk, Be careful working around High Voltage.
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https://www.youtube.com/watch?v=ob5XuYTe6Jc