Electronics > Projects, Designs, and Technical Stuff
How does this motion sensor work?
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Zero999:
Single transistor? There are two transistors near the antenna.

The transistor is just an amplifier in the oscillator. All the clever stuff is done by the integrated circuits.
glarsson:
The RCWL-0516 page shows only one transistor, Q1. There's only one connection from the 3.2GHz part (Q1) to pin 14 (opamp input) on the IC. Everything RF is done by Q1.
Zero999:

--- Quote from: glarsson on November 23, 2018, 10:51:17 am ---The RCWL-0516 page shows only one transistor, Q1. There's only one connection from the 3.2GHz part (Q1) to pin 14 (opamp input) on the IC. Everything RF is done by Q1.

--- End quote ---
I was referring to the picture attached to the original post, which clearly shows two transistors, although one of those three pin SMT packages could be a voltage regulator. In any case, the transistors are not doing anything remarkable. The one near the antenna is just an RF oscillator.
IanMacdonald:
Probably microwave, and those things give more false alarms than an Orkney social worker.
glarsson:

--- Quote from: IanMacdonald on November 23, 2018, 11:18:06 am ---Probably microwave, and those things give more false alarms than an Orkney social worker.

--- End quote ---
It surely can't be that bad?
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