Every time you use the oscilloscope I learn more about the device on the board. I have several now and I use them as often as possible. A neighbor of ours used similar old phones in an intercom, built from scrap parts, between his living room and garage electronics shop. The design of a simple com between two old phones would be a fun topic for a future video.
Brilliant Bill thank you so much for trip down memory lane for an old foggie I was around when the so called step by step with rising and rotating mechanisms, which were prone to jamming were replaced by the ‘modern’ side bar systems! Fascinating technology for its time but what an amount of space it required. I look forward to your offerings and insight
Interesting chip, never looked into how that worked so thanks! The PSTN electrical interface isn't going anywhere anytime soon. BT and telephone companies that provide fixed lines are replacing the copper lines with fibre. They provide VoIP adapters that emulate the exchange allowing old phones to be used. Of course inside the VoIP adapters are the DC-DC converter and AC inverter to recreate the high-voltages the interface requires only for the electronics in the telephone to promptly reduce it back down a few feet of copper later...
I've been mucking around with getting an ATTiny to authentically ring a GPO bell telephone... so this is very interesting to me. Interesting article with an old school circuit to drive a ringer: worldradiohistory.com/UK/Everyday-Electronics/90s/Everyday-Electronics-1992-04-S-OCR.pdf Nice shout-out to Tommy Flowers... who didn't get enough recognition in his lifetime.
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Every time you use the oscilloscope I learn more about the device on the board. I have several now and I use them as often as possible. A neighbor of ours used similar old phones in an intercom, built from scrap parts, between his living room and garage electronics shop. The design of a simple com between two old phones would be a fun topic for a future video.
Brilliant Bill thank you so much for trip down memory lane for an old foggie I was around when the so called step by step with rising and rotating mechanisms, which were prone to jamming were replaced by the ‘modern’ side bar systems! Fascinating technology for its time but what an amount of space it required. I look forward to your offerings and insight
Interesting chip, never looked into how that worked so thanks! The PSTN electrical interface isn't going anywhere anytime soon. BT and telephone companies that provide fixed lines are replacing the copper lines with fibre. They provide VoIP adapters that emulate the exchange allowing old phones to be used. Of course inside the VoIP adapters are the DC-DC converter and AC inverter to recreate the high-voltages the interface requires only for the electronics in the telephone to promptly reduce it back down a few feet of copper later...
Thanks Bill, Very interesting little chip. Maybe it could be repurposed to be used with your doorbell.
Eeee, by gum!
Ain't nostalgia grand?
I've been mucking around with getting an ATTiny to authentically ring a GPO bell telephone... so this is very interesting to me.
Interesting article with an old school circuit to drive a ringer: worldradiohistory.com/UK/Everyday-Electronics/90s/Everyday-Electronics-1992-04-S-OCR.pdf
Nice shout-out to Tommy Flowers... who didn't get enough recognition in his lifetime.