Combustible gas alarm circuit diagram 2 7806 KD28


Posted on Mar 28, 2007

As shown in FIG alarm by a gas-sensitive sensor element QM, buck rectifier and regulator circuits, integrated circuits KD28, speaker Y and other components. Gas-sensitive senso


Combustible gas alarm circuit diagram 2 7806 KD28
Click here to download the full size of the above Circuit.

r element QM is QM-N5 type. Buck regulator circuit by a transformer rectifier and B, the rectifier bridges D1 ~ D4, C1, C2, integrated voltage regulator 7806 and other components.In operation, the adjustment potentiometer W, so energized for 1 minute. When the air is clean, QM corresponding resistance value is large, the partial pressure of the small W, so that the KD28 reset the alarm does not occur. When flammable gas when in contact QM, QM corresponding resistance value is small, the pressure on the larger points W, so that the KD28 set, 3 feet high output speaker promoting work, an alarm signal. After the gas leaves the circuit will resume normal operation.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Audio Stereo Mixer circuit
Half wave AC phase-controlled circuit
ISP Flash Microcontroller Programmer
fast voltage driven current source
big e stereo parabolic microphone
bridge
IR Headset Circuit with headphone Transmitter and Receiver diagram
20W bus circuit radio and megaphone
Control cables plus anti-interference capacitors
High voltage stabilizing circuit diagram composed of optocouplers



Top