Wiring up 2 old (different) intercom, help

[Antikeppi]

Hi! I’m connecting 2 identical intercoms, but they use different abbreviations. In 1 it uses L,EK,MZ,WZ, and the other one it uses L, MC, C, and ZC. I don’t know how to connect them. I’m using 9V batteries to connect them. For now I’m connecting the L cables together with 1 9v battery. But if I connect them, 1 intercom starts with ringing. Idk how to properly connect them. I have L connect with battery and then connected to the other L; EK with ZC; WZ with C; and MZ with MC. Can anyone tell me what those abbreviations mean? And tell me which cable with should be connected with the battery? Thanks

[russell_w_b]

I think C and Z stand for Carbon and Zinc: positive and negative battery connections in other words. E might be Earth Return and L line. Earth can be replaced with another line wire. I’ll check when I’m back home in front of a book.

[Antikeppi]

Originally Posted by russell_w_b

I think C and Z stand for Carbon and Zinc: positive and negative battery connections in other words. E might be Earth Return and L line. Earth can be replaced with another line wire. I’ll check when I’m back home in front of a book.

Hi! Thanks, but I did a small error, it’s not ZC but ZT, in 1 intercom there are the following abbreviations; ZT,C,MC,L
The other; EK,WZ,MZ,L
Sorry I wasn’t home and I had to guess

[Roger Ramjet]

Photo's would help Andy...

Rog

[russell_w_b]

* ZE = Zinc and Earth (meaning negative of battery and earth return).
* C = Carbon (positive of battery).
* MC = Microphone carbon (one side of the microphone).
* L = Line.

Those are the 'English' terminal markings. Beyond that, different manufacturers have different nomenclature! It would be wrong to guess but you're unlikely to damage anything if mis-connected, other than perhaps inadvertently short out a battery.

Like Roger says, a pic would be good.

[Antikeppi]

Sure, here they are, ill add 1 more

[Antikeppi]

here is the last one

[Antikeppi]

Originally Posted by russell_w_b

* ZE = Zinc and Earth (meaning negative of battery and earth return).
* C = Carbon (positive of battery).
* MC = Microphone carbon (one side of the microphone).
* L = Line.

Those are the 'English' terminal markings. Beyond that, different manufacturers have different nomenclature! It would be wrong to guess but you're unlikely to damage anything if mis-connected, other than perhaps inadvertently short out a battery.

Like Roger says, a pic would be good.

Thanks! But I’m wondering, which “station” to which station, should be connected to? Because I have 2 different intercoms, identical, but they use different abbreviations, if I connect C and ZT to the battery, where should I connect the “WZ” (Wecker = ringer) from the other intercom?

[Roger Ramjet]

Nice looking units Andy,

It looks like the terminal blocks are later add on. At the mo it is guesswork but if the units were wired as suggested in your previous post then two terminals would be for the battery noting one would reverse polarity to the other.

The other two wires would be for the line.

I would start again & rewire rather than faff about with existing. Easy to sort on the bench.... pity you are not local.

Rog

[Antikeppi]

Originally Posted by Roger Ramjet

Nice looking units Andy,

It looks like the terminal blocks are later add on. At the mo it is guesswork but if the units were wired as suggested in your previous post then two terminals would be for the battery noting one would reverse polarity to the other.

The other two wires would be for the line.

I would start again & rewire rather than faff about with existing. Easy to sort on the bench.... pity you are not local.

Rog

I connected C and ZT to the battery, and the 2 L's together. I still miss EK and WZ , where should I connect them? Im new in these type of stuff, if u could make me a little scheme of what should be connected to, it would be fantastic.

[dagskarlsen]

Not sure what you have of tools and instuments, so here is the without anything way of testing:

Use a 9V battery and test the termiansls until you hear a loud click in the receiver, then hold the hook switch in on hook position and test the same 2 terminals. The ringer should ring, and you have identified the line terminals. Do the same on the other phone, and connect them together. Battery to the other 2 terminals, and you should hear the sound in both phones. (Z is negative ) normal voltage would be 3-4.5 V. Looks like these phones not polarity dependent, but if you not get the wanted effect try to reverse polarity on one phone, and only one.

[Antikeppi]

Originally Posted by dagskarlsen

Not sure what you have of tools and instuments, so here is the without anything way of testing:

Use a 9V battery and test the termiansls until you hear a loud click in the receiver, then hold the hook switch in on hook position and test the same 2 terminals. The ringer should ring, and you have identified the line terminals. Do the same on the other phone, and connect them together. Battery to the other 2 terminals, and you should hear the sound in both phones. (Z is negative ) normal voltage would be 3-4.5 V. Looks like these phones not polarity dependent, but if you not get the wanted effect try to reverse polarity on one phone, and only one.

I'll try this when ill come home, but im wondering; if I found the 2 terminals for each phone, the other 2 terminals should be connected to the other 2 terminals of the phone right? I mean, if I have found the "battery" terminals, ill have 2 terminals on 1 phone and other 2 terminals on the other phone, should those be connected together or they also need to be connected to a battery?

[Roger Ramjet]

Originally Posted by dagskarlsen

Not sure what you have of tools and instuments, so here is the without anything way of testing:

Use a 9V battery and test the termiansls until you hear a loud click in the receiver, then hold the hook switch in on hook position and test the same 2 terminals. The ringer should ring, and you have identified the line terminals. Do the same on the other phone, and connect them together. Battery to the other 2 terminals, and you should hear the sound in both phones. (Z is negative ) normal voltage would be 3-4.5 V. Looks like these phones not polarity dependent, but if you not get the wanted effect try to reverse polarity on one phone, and only one.

Absolutely spot on advice !

Battery polarity won't affect the buzzer calling but may stop speech if the telephony components are series connected.... in which case one battery would need to be reversed to mitigate the counter emf effect.

[Antikeppi]

Ok I have found the line lines in each phone, what should I do next? Should I just connect the other 2 cables on the battery?

[Roger Ramjet]

Yes worth a try..... as above, if no speech then try reversing polarity on one of the batteries.