2-way school intercom.
The kit learns you how the LM386 IC can be used as an amplifier of 1W. It's powered by a 9V Battery, a double pole switch is used for talking when pressing it, and will listen when you release it.
The LM386M are power amplifiers designed for use in low-voltage consumer applications. The gain is internally set to 20 to keep the external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.
We even have a 2way intercom project to show you how!
2-way school intercom Specification:
Capacitor Values: 4x 100uF, 2x 10uF
Diodes: 2x 1N4001 Diode
Speakers: 2x 8Ohm 3Watts Speaker
Mic: 2x Ultrasonic speaker
Connectors: 4x Pin connectors
Amplifier: 2x LM386 Amplifier IC