Show threadSeverinJan 28, 2025
Did some more experimentation today. Like hooking up the #fieldtelephone to the barbed wire fence phone experiment. And while we were able to talk while the FT was in OB mode, it wouldn’t work while in ZB mode. And even after looking at the schematic for half an hour still don’t quite understand while.
Also didn’t take any pictures today, which kind of bugs me 😑
SeverinJan 22, 2025

Continuing on the #fieldtelephone and also #barbedwirefencephone journey, I got two actual field telephones last weekend 🥳 (yes, finally, and only now 🙈)

Time to test a few things!

SeverinOct 8, 2024
We’re getting a ringing phone 🥳 unfortunately it only works on a newer phone with electronic ringing detection. When trying a more traditional phone, voltage breaks down from ~50V to ~20V AC. I assume I’ll need a different transformer to up the voltage a bit more. And then try it out on a real field telephone.
#oshw #fieldtelephone
SeverinSep 7, 2024
Also, PCBs for the phone receiver breakout board arrived. Found the design online, but even that was surprisingly hard. Connectors have been ordered yesterday; let's see when they show up.
#diy #pcb #electronics #fieldtelephone
SeverinSep 7, 2024
Did some testing on the field telephone ringing circuit this week, with no real success. Connected an old phone (through some old french connector because that's all that we had available), but couldn't get a ring out of it. I'm assuming it's because the wave form we're getting is way off. At least we got some proper voltage, so that's a start. Now, I need to order some more parts, or try a different circuit to make this work
#diy #fieldtelephone #electronics #oshw
Show threadSeverinAug 28, 2024

Progress progress progress!

Built the 555 version of this thing, and tada, we have a proper signal one can work with. I was missing an inductor, which would’ve made this more of a sinewave. Next step will be to get that missing part as well as a transformer to get the voltage up to whatever we need to make a phone ring. Then get a real field telephone to test it out

Also ordered some RJ10 adapter PCBs to start building a phone receiver amplifier

#fieldtelephone #feldtelefon #electronics

Show threadSeverinAug 7, 2024

Did my first try at building the ringer circuit. Turns out my knowledge of analog electronics is even worse than I thought 😅

Initially I thought about building this thing with as little “advanced” components as possible, but maybe this is not the best way to start off. So back to the drawing board I guess.

#Feldtelefon #fieldtelephone #electronics

SeverinJul 27, 2024

Seeing some #fieldtelephone stuff here again, which brought up an older thought again

Are there any DIY field telephone kits/PCBs/schematics out there, possibly open source hardware?

I know there are schematics for most field telephones out there but it doesn’t seem like parts would be easily available. I was thinking of something like a PCB you could just plug a POTS phone receiver into. Anyone ever seen something like that? Or do I have to keep it on my project list 😅

#Feldtelefon #oshw