This is a circuit for manual telecommunication that anyone can put together and get to work. This circuit is based using LM380. This chip is able to put out 2 watts of power if it is heat sink properly. This is the figure of the circuit.
The following pins should be grounded and attached to a foil to dissipate the heat. Pins 3, 4, 5, 10, 11, 12 should all be grounded. The circuit works as follows. Switch 1 is a double pole double throw switch. In one position is the talk position and in the other is the listen position. In the diagram shown the switch is in the talk position for the speaker on the left. Talking into the speaker inputs a signal to the IC chip through the matching transformer T1. The output from the IC chip goes to the speaker on the right.
The following pins should be grounded and attached to a foil to dissipate the heat. Pins 3, 4, 5, 10, 11, 12 should all be grounded. The circuit works as follows. Switch 1 is a double pole double throw switch. In one position is the talk position and in the other is the listen position. In the diagram shown the switch is in the talk position for the speaker on the left. Talking into the speaker inputs a signal to the IC chip through the matching transformer T1. The output from the IC chip goes to the speaker on the right.
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