Using kd-28 to do the voice switch circuit diagram


Posted on Mar 28, 2007

As shown is a practical voice-activated switch, A1 amplifier connected as a conventional microphone B picked up the audio control signal is amplified. After the amplified signa


Using kd-28 to do the voice switch circuit diagram
Click here to download the full size of the above Circuit.

l through C5, VD1, VD2 voltage doubler rectifier to charge the capacitor C6, when the voice signal is sufficiently large, the charging voltage of 7 feet high and A2 level, then use similar op amp amplifier A2 output high relay K is energized, its normally open contact closure turned the accused appliances. R7 and VD3 amplifier A2 self-locking, so that A2 is always 5 feet high output, ensure attracted state relay. SB is the release button, when pressed SB, 8 feet to the A2 input low, A2 flip, 5-pin output low, the relay K release. Potentiometer RP used to adjust the sensitivity level of the voice circuit. In the selection of the relay K work should pay attention to their rated voltage should be lower than the supply voltage Vcc of about about 2V.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Expandable Graphic Equaliser circuit
Ignition pulses counter
Wide-range-rf-power-meter
CD4013 Push Button CMOS Toggle Flip Flop
ir remote control home appliance
pic LM032
pipe descaler schematics
FSK Demodulator
MOSFETs IN SERIES
High Quality Intercom
Hi-fi AM detector
install-a-piezo-bridge
Variable Dc Power Supply



Top