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Controlling
Unit
The controlling unit ( Exchange )
This circuit is base on PIC16F84A microcontroller. Two slimier
SLIC are connected to The controlling unit. It needs to identify
following connections on the controlling unit circuit diagram.
TN_SLIC_1 & TN_SLIC_2
SD_SLIC_1 & SD_SLIC_2
RG_SLIC_1 & RG_SLIC_2
One SLIC connections should be marked as,
1. TN_SLIC_1
2. SD_SLIC_1
3. RG_SLIC_1
Other SLIC connections should be marked as,
1. TN_SLIC_2
2. SD_SLIC_2
3. RG_SLIC_2
These connections should be connected as on the controlling unit
circuit diagram.
Parts List :
Transistors
1. 2SC945 x 3
Diodes
1. 1N4007 x 1
2. 1N4148 x 2
3. LED x 1
Capacitors ( 16 V )
1. 4.7 uf x 4
2. 22 pf x 2
Resistors
1. 10 K x 4
2. 4.7 K x 4
3. 330 x 1
Other Parts
12 V telephone rely x 1
Necessary wires
PIC16F84A with the firmware
Unit developed by
Achira – [email protected]
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