| Electronics > Projects, Designs, and Technical Stuff |
| How does this motion sensor work? |
| << < (3/4) > >> |
| 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? |
| Navigation |
| Message Index |
| Next page |
| Previous page |