Racal IR772 PIR - full examination

For 40 years I've been working with PIRs.
I have quite a collection of old ones from the early 80s.
This is the RACAL GUARDALL IR772 - MkII
In this video:
Examination, PIR lens pattern (red LED) and Walk around
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HOW A PIR WORKS:
• PIR motion detector - ...
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THE MRMATTANDMRCHAY CHANNEL, established 2008:
I'm passionate about uploading quality and interesting videos for YOU, my audience.
What is my channel about? "Old lift machinery made interesting", old air-raid sirens, prehistoric alarm equipment. If "I" don't find it interesting ...then IT DOESN'T GET UPLOADED!
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