FSK receiver (CB14568E)

This circuit is from the Motorola Linear Databook of 1990. The coils must be according to the frequency of the signal.

| Clique na imagem para ampliar |

Soil Moisture Sensor (CIR2767E)
This circuit triggers a relay when the detected humidity falls below a value. The system can be...
20 kHz ring counter (CB6138E)
We found this circuit in an old General Electric documentation. In fact, PUTs are not common...
Magnetic Command Alarm (CB17015E)
This alarm circuit was found in a 1997 publication. It uses two reed-switches to arm and disarm the...