Proximity detector circuit
NE567 tone decoder / PLL IC. NE567 is a tone decoder IC from Philips. The IC has a built in PLL circuit with AM lock detection and an output driver circuit. …
Archive by category Sensor Circuits
Liquid level indicator
LM1830 based liquid level indicator circuit. LM1830 is a monolithic integrated circuit that can be used in liquid level indicator / control systems. …
Digital compass circuit
Description. Here is the circuit diagram of a very simple and accurate electronic compass using the 1490 digital compass from Dinsmore. The 1490 digital …
Temperature controlled LEDs
Description. The circuit is nothing but two LEDs (D1 and D2), whose status are controlled by the temperature of the surroundings. The famous IC LM35 is used as …
Zero degree Celsius alarm
Description. This simple circuit will produce an alarm whenever the temperature falls below zero degree. A thermistor is used here to sense temperature. The …
VHF field strength meter
Description. This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and …
Electromagnetic field sensor circuit
Notes. This is a very simple circuit that can be used to sense electromagnetic radiations. The circuit can even detect hidden wrings. A 1mH inductor is used …
Single chip metal detector circuit
Description. This is a simple single chip metal detector circuit based on IC CS209A from the Cherry Semiconductors. A 100uH coil is used to sense the presence …
Touch switch using CD4011.
Description. A simple touch switch circuit using CD4011 is given here. The IC CD4011 is wires as a flip flop here. The 9, 13 pins of the IC works as the set …
Water Sensor Circuit with Alarm
If you are looking for a Water level indicator or a Water level controller, there are pretty good circuits we have developed. This one is just a fun project …