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How to build Intercommunication (Intercom)
December 8, 2010 - category: IntercomDescription
This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side.
Circuit diagram
Componets Layout
PCB
Parts
- R1: 2,2 M
- R2: 10 Ohm
- R3,R6: 100K
- R4: 22K
- R5: 1M
- C1: 0,2uF
- C2: 0,02uF
- C3: 0,001uF
- C4: 0,05uF
- C5: 100uF/40V
- C6: 200uF/40V
- IC1: PA234
- LS1,2: 20-45 Ohm
- T1: 2N3391 (BC383)
- P1: 5K
- S1: SW-DPDT *
See here how the SW should be.
circuit from http://www.electronics-lab.com/
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