Natural gas stove flame alarm


Posted on Mar 28, 2007

After the gas stove ignition, closing switch S, the circuit is in working condition. Phototransistor VT1 by flame before irradiation, low resistance state, the transistor VT2: saturated conduction, VT3 and integrated sheet music collector connected to


Natural gas stove flame alarm
Click here to download the full size of the above Circuit.

the trigger terminal of the IC at a low potential, lC does not work, the speaker BL does not sound. If the gas stove in the combustion process for some reason suddenly went out, VT1 lose strong light irradiation, the internal resistance increases, VT2 exit saturation tends deadline, 1C trigger terminal is at a high level, Ic work, the music signal emitted by the crystal tube VT3 zoom promote BL issued birdsong alarm to alert the owner to close coal gas valve. In addition to the figure stated, transistors VT1 and VT2 of ~ 500.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Mike Pads
Long time delay
Extended-play-circuit
Solid-State Relay
gsm cell phone jammer circuit
mechatronics Design
Charged Capacitor to Light an LED
Digital Remote Thermometer
LED Volt Meter
RF amplifier and filter for 144 MHz
100W full-wave single-junction transistor trigger doer control circuit
DC relay circuit to accelerate the release



Top