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Tuesday, April 9, 2013

Remote Control Using the NE 555 and LM 567


Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit’s transmitter IC is controlled by NE555.
Receiver circuit works by the signal emitted frequency which is emitted
by that transmitter circuit. Transmitted signal frequency must be equal
to the frequency decoder of the receiver circuit. The NE 555 generated frequency is same that receive frequency of IC LM 567. 

The output frequency of the transmitter circuit is f,
f = 1.44/(Ra+2Rb)C
The resistor R1 is a receiver variable to facilitate the process of tuning.
The system works well when the circuit is ready. The first step is
tuning by way of the transmitter is turned on continuously, while the
receiver R1 to set the value to be able to detect the signal
transmitter. The second part is the receiver is controlled by LM 567. The following is a schematic drawing recipient.

f = 1 / (1.1 xR1xC1)
This frequency depends on the value of R1 and C1.

In the picture on top of each channel is designed with a different frequency. By considering the bandwidth
of the frequency detection signal LM 567, inter-frequency channels
should have a big enough difference, let’s try with a difference of 5
KHz.

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