sensor circuits
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Temperature Meter
Feb 15th
This temperature meter uses the precision micro power centigrade sensor IC LM35. The output voltage of the IC is linearly equal to +10Mv per degree centigrade. The temperature level is displayed through LED readout.
HEAT SENSOR
Nov 15th
This simple circuit senses heat from electronic devices and gives warning alarm. It is an ideal add on circuit to monitor heat in CD players, Amplifiers etc. D.MOHAN KUMAR (more…)
Seismic Sensor
Nov 13th
Here is an ultra sensitive vibration alarm that can sense very minute earth borne vibrations. It can be used to detect vibrations in the earth (Earth quake?). So it is an ideal device to monitor entry passages. The circuit exploits the direct piezo electric property of the piezo element used in buzzers. The Lead Zirconate crystals present in the piezoelement can readily store current and can release the current when the orientations of the crystals are disturbed through mechanical vibrations. IC1 amplifies the signals from the piezo element and the high output from IC1 switches on T1. When T1 conducts, More >
Ultrasonic Sensor Circuit
Nov 4th
This Ultrasonic Sensor Circuit consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered the circuit’s fine balance is disturbed and the alarm is triggered. The ultrasonic circuit is very sensitive and can be adjusted to reset itself automatically or to stay triggered till it is reset manually after an alarm. (more…)
Sensitive potentiometer, commutator
Oct 31st
This sensitive commutator is based on IC1, one operational amplifier with a high input impedance. When the finger touches Se1 sensor, C2 is charged, this will cause the linear dropdown of the IC1 output voltage. When we touch Se2 sensor the opposite occur. This sensitive potentiometer circuit has different applications and can be user anywhere is needed a potentiometer wich can be controlled with variable voltage. If you need normal commutators or buttons place serial 1M resistor. (more…)
Radio field signal strength indicator
Oct 4th
A radio field signal strength indicator is very usefull for determine radiation patterns of transmitters antennas. An ancillary antenna must be put close to main transmitter antenna. The received signal is applied to L1,L2 and C2, this allows the field indicator circuit to adjust to the same frequency as the transmitter. With the coils values from the radio signal indicator wiring schematic, the frequency band is 6 to 60MHz. A pair of headphones can be connected to hear the transmission. The total impendance of the headphones has to be at least 2.2Kohm. (more…)
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