Transmitter design scheme
Antenna
Transmitter
Ambient control
sensitive light
Manual mode
Ambient control
mode
On/off
switch
MIC
Logic Block Diagram
Function
button circuit
Sound control
chip
Filter enlarge
Microphone
Status
direction
Spansion
signal processing unit
A/D coded conversion
output
Voltage-stabilizing and filter
12V battery
Coded
signal
Transmitter
antenna
Radio-frequency carrier
shift signal output
High frequency local
oscillator signal modulate
433.92MHZ
quartz crystal
local oscillator