Racal Guardall IR1012 - old PIR examination

Not a cheap solution - This was £40 ($53) back in 1986, the equivalent of £100 ($134) today for a single PIR. Nowadays you can buy a good wired PIR for around £10 ($13).
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 IR1012 and IR1025
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HOW A PIR WORKS:
• PIR motion detector - ...
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