intercom automatic switchboard circuit - Electronic Circuits Projects Diagrams Free

ghost:stalker · 18th March 2003, 07:16 PM

el0 all. wondered if ne1 could help us out trying to find a switchboard circuit for a 4 way intercom, which can connect 2 handsets upon request by user automatically. if not a circuit which requires manual input will do fine

**mechie** · 19th March 2003, 10:34 AM

Do the handsets already exist?
if so...Are they two wire or more?
.........What kind of voltage do they require?

How do you envisage the user choosing which of the other three handsets he wishes to be connected to?

How do you envisage alerting someone to the fact that somebody wishes to talk to them (a buzzer?) and is this built in to the handset?

ghost:stalker · 19th March 2003, 05:27 PM

sorry there are 4 handsets (which are built using LM380 amplifier chipsets and the preamplifiers are just basic transistor circuits) which are 2 wire, they will all be linked to the switchboard. If a person wants to contact another handset, they will press 1 of 3 buttons on handset corrisponding to the handset they want, which will alert other handset. The other handset will press buton which will connect the two so they can speak. Im real rookie to electronics, so if u need more info just let us know!

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18th March 2003, 07:16 PM	(permalink)
ghost:stalker	intercom automatic switchboard circuit el0 all. wondered if ne1 could help us out trying to find a switchboard circuit for a 4 way intercom, which can connect 2 handsets upon request by user automatically. if not a circuit which requires manual input will do fine

19th March 2003, 10:34 AM	(permalink)
mechie	Auto Intercom Do the handsets already exist? if so...Are they two wire or more? .........What kind of voltage do they require? How do you envisage the user choosing which of the other three handsets he wishes to be connected to? How do you envisage alerting someone to the fact that somebody wishes to talk to them (a buzzer?) and is this built in to the handset? __________________ I need a memory upgrade ... My head is full !

19th March 2003, 05:27 PM	(permalink)
ghost:stalker	sorry there are 4 handsets (which are built using LM380 amplifier chipsets and the preamplifiers are just basic transistor circuits) which are 2 wire, they will all be linked to the switchboard. If a person wants to contact another handset, they will press 1 of 3 buttons on handset corrisponding to the handset they want, which will alert other handset. The other handset will press buton which will connect the two so they can speak. Im real rookie to electronics, so if u need more info just let us know!