HOW TO CONSTRUCT A SIMPLE INTERCOM
Intercom or inhume communication circuit could be a 2 directional communication system. It provides a reliable communication line and is extraordinarily straightforward to implement. The circuit is ready by associate degree electronic equipment, 2 switches and 2 loudspeakers. We are able to extend this circuit by adding a lot of variety of speakers with the assistance of switches. IC LM384 works as influence output electronic equipment during this intercommunication system circuit. LM384 provides nearly a pair of watts of audio power via fifteen volts provide voltage. This intercommunication system circuit diagram is extremely straightforward and sensible circuit capable of victimization intercoms for homes, workplace intercommunication system.
Components needed for 2 means intercommunication system
- Power provide (15V)
- Resistors (1kΩ x 2; five.6kΩ; 22kΩ; 100Ω x 2)
- Preset (10kΩ)
- Capacitors (0.01µF; 0.1µF x 2; 0.047µF, 220pF)
- Electrolytic Capacitors (10µF:25V; 100µF:25V x 3; 47µF:25V x 2)
- Transformer (220/6V step-down)
- Speaker/ electro-acoustic transducer (8Ω)
- 2 means Switch x a pair of
- Working of wired intercommunication system
Here the 8Ω speaker acts as electro-acoustic transducer additionally as Speaker consistent with the switch positions. If switch S1 is in ‘Talk’ contact, L1 functions as an electro-acoustic transducer. If it’s in ‘Listen’ position, L1 functions as a Speaker. (Similar case applicable in L2 additionally.) Time being let’s think about S1 is in ‘Talk’ position and S2 in ‘Listen’ position. Since the bulk speaker’s area unit obtainable with electric resistance low, associate degree electric resistance device is needed to retain a high-quality audio. Impedance matching is finished by the electrical device T1. (This electrical device is a normal 220/6V transformer.) IC NE5534 works as Pre electronic equipment that boosts the Audio signal before applying to the LM384 electronic equipment section. The gain of the LM384 op amp electronic equipment is about to eleven. The output volume will be adjusted by varied the R4 predetermined. In order to use this circuit as intercommunication system, the band breadth is chosen to one hundred sixty cps to ten kHz. Choice of different band breadth varies results HIFI electronic equipment. Place the facility provide unit severally from the most circuit to avoid interference. By ever-changing the switch positions of S2 in to ‘Talk’ position and S1 to ‘Listen’ position, L2 get connected to the input section and L1 connected to output section. Then L2 functions as electro-acoustic transducer and L1 as Speaker. Therefore a pair of directional communications is achieved. Circuit simply used for .house intercommunication system or home intercommunication system systems.