if you don't have a transformer you can use a nine volt battery to power the carbon mike. Which also means you can feed it into inputs that don't have phantom power. You make a circuit with the battery connected to the mike through a resistor and then take the audio out through the capacitor and ground.
Very cool video! I hate to even ask, because you did such a great job with this video, but is there a way to build one of these so that there are two outputs; one for the carbon mic and one for the other microphone? Essentially, having two separate circuits in the same handset, with one mic on each end? If so, would you mind showing us how?
It's very neat. I would have made it so you had two XLR3 ends coming out of it, so if you wanted to, you could mix them together on your mixing console. I don't know how useful it would be for voice but for some instruments like drums you would have that feature.
done it, works a charm! for all you wondering, yes you can use the - um - spirally wire. i set it up so that the xlr plug is in the housing of the old telephone body. if you don't know what to do with the ground wire from the xlr cable, you can connect it to the negative (3) wire, of said xlr cable.
Thanks a ton for this vid Ryan! I'm currently in the process of getting parts for this project, and as I'm a bit of a novice when it comes to the electrical engineering side of audio work, I wanted to ask what type of capacitor you used. The lack of polarization denoted on the diagram would make me think ceramic, but (and my eyes could very well be deceiving me) the capacitor in the video looks more like an electrolytic capacitor to me, so I was a bit confused. Also, should I have any worry about the direction of the transformer, or will that not matter since it's 1:1? I appreciate any clarification! I just really want to make sure I go about this project correctly 😅
What brand did you use for this build? I suspect some will not be this easy. Do you think later models that were button instead of rotary will have the same setup inside?
if you don't have a transformer you can use a nine volt battery to power the carbon mike. Which also means you can feed it into inputs that don't have phantom power. You make a circuit with the battery connected to the mike through a resistor and then take the audio out through the capacitor and ground.
Are you sure your wiring is correct? You're showing 48+ volts on your ground wire.
so...could you just use parts scavenged out of the body of the phone? Assuming the parts are of the appropriate values, of course...
Very cool video! I hate to even ask, because you did such a great job with this video, but is there a way to build one of these so that there are two outputs; one for the carbon mic and one for the other microphone? Essentially, having two separate circuits in the same handset, with one mic on each end? If so, would you mind showing us how?
Can you also reuse the coil telephone cable as for a example an instrument cable if you solder it newly?
After watching your VDO, I just went out to the thrift store to get those rotary phones. Thanks for this VDO.
It's very neat. I would have made it so you had two XLR3 ends coming out of it, so if you wanted to, you could mix them together on your mixing console. I don't know how useful it would be for voice but for some instruments like drums you would have that feature.
hello! i did this and i get a lot of ground noise, how can i fix that?
Wow best video on this subject! and the sound examples were so helpful.
How is the speaker also a mic?
This has been going around in my head recently. Now that I see it in practice I will definitely try it out! Great video Ryan!
What a great video, project, etc. I want to make one now!!!
Thank you for that, i'd love some other building tutorials in the futur
done it, works a charm! for all you wondering, yes you can use the - um - spirally wire. i set it up so that the xlr plug is in the housing of the old telephone body. if you don't know what to do with the ground wire from the xlr cable, you can connect it to the negative (3) wire, of said xlr cable.
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Very good
great stuff, need to make one for myself :)
Thanks a ton for this vid Ryan! I'm currently in the process of getting parts for this project, and as I'm a bit of a novice when it comes to the electrical engineering side of audio work, I wanted to ask what type of capacitor you used. The lack of polarization denoted on the diagram would make me think ceramic, but (and my eyes could very well be deceiving me) the capacitor in the video looks more like an electrolytic capacitor to me, so I was a bit confused. Also, should I have any worry about the direction of the transformer, or will that not matter since it's 1:1? I appreciate any clarification! I just really want to make sure I go about this project correctly 😅
Could someone explain using the PCB, Is it just to connect the audio transformer to both mics and the switch?
What brand did you use for this build? I suspect some will not be this easy. Do you think later models that were button instead of rotary will have the same setup inside?