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433.92 MHz FM Data Receiver
- 433.90 MHz (TTL High Output)
- 433.94 MHz (TTL Low Output)
The low and high pulses are encoded with frequency shift keying. The receiver can only decode a pulse stream.
A possibly student-proof module.
- D1 is a polarity protection diode.
- R1 limits the current to about 15mA. About half this current flows through the Zener diode and the rest is taken by the receiver module.
- ZD is the 5.1 Volt Zener diode used to provide a stable 5 volt supply for the receiver.
- R2 limits the transistor base current to about 50µA
- The diode in series with R2 is used to drop 0.7 volts ensuring the transistor turns off properly.
- The transistor (BC182L) acts as a switch. When on, it pulls the output voltage down to about 0.2V
- R3 is a pull-up resistor. This holds the output voltage high while the transistor is off.
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