RF Transmitter for PIR Sensors Circuit Diagram
This is the Simple RF Transmitter for PIR Sensors Circuit Diagram.
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Tester for Inductive Sensors
This tester uses a LED to indicate whether an inductive sensor is generating a signal. It can be used to test the inductive sensors used in ABS and EBS systems in cars, with engine cam- shafts and flywheels, and so on. The circuit is built around an LM358 dual opamp IC. The weak signal coming from the sensor (when the wheel is turning slowly, for example) is an AC voltage. The first opamp, which is wired here as an inverting amplifier, amplifies the negative half cycles of this signal by a factor of 820. The second opamp is wired as a comparator and causes the red LED to blink regularly. In order to judge the quality of the signal from the sensor, you must turn the wheel very slowly. If the red LED blinks, this means that the sensor is generating a signal and the distance between the sensor and the pole wheel (gear wheel) is set correctly. If the distance (air gap) is too large, the sensor will not generate a...