Uploaded March 2024 | Updated September 2026, 2 weeks ago
Playing with a revised DTMF decoder MT88L70 3.3v power/GPIO, and audio matrix switching.
PCBWay Supports High Precision Advanced PCBs: pcbway.com
PCBs at PCBWay pcbway.com/project/shareproject/DTMF_Decoder_3_3v_MT88L70_e9c3218d.html
Design files github.com/GadgetReboot/DTMF_Decoder_3V3
Using a 3.3v powered DTMF decoder makes it easier to interface directly with ESP32 compared to the 5V version, which requires level shifting.
The ongoing phone line experiments may expand between just two node direct interfacing.
An MT8808 8x8 analog crosspoint switch is being tested to see if phone line audio can be routed between channels. This may enable a central coordinator to manage call requests and phone line routing between multiple nodes, including multi node party line call connections.
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Join a membership on this channel: youtube.com/channel/UCwiKHTegfDe33K5wnmyULog/join
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Videos are mirrored at LBRY/Odysee: odysee.com/@GadgetReboot:4
#ElectronicsCreators
Playing with a revised DTMF decoder MT88L70 3.3v power/GPIO, and audio matrix switching.
PCBWay Supports High Precision Advanced PCBs: pcbway.com
PCBs at PCBWay pcbway.com/project/shareproject/DTMF_Decoder_3_3v_MT88L70_e9c3218d.html
Design files github.com/GadgetReboot/DTMF_Decoder_3V3
Using a 3.3v powered DTMF decoder makes it easier to interface directly with ESP32 compared to the 5V version, which requires level shifting.
The ongoing phone line experiments may expand between just two node direct interfacing.
An MT8808 8x8 analog crosspoint switch is being tested to see if phone line audio can be routed between channels. This may enable a central coordinator to manage call requests and phone line routing between multiple nodes, including multi node party line call connections.
If you'd like to support the channel, you can:
Join a membership on this channel: youtube.com/channel/UCwiKHTegfDe33K5wnmyULog/join
Support me on Patreon: patreon.com/gadgetreboot
Become a channel member (click the Join button): youtube.com/c/GadgetReboot
Shop through my affiliate links (I may earn a small commission, costs you nothing)!
Banggood banggood.com/custlink/3vKYLANH8N
Aliexpress https://s.click.aliexpress.com/e/_AFeHwB
Amazon.com amazon.com/?&_encoding=UTF8&tag=gadgetreboo05-20&linkCode=ur2&linkId=952875a3564e2204d1786f94b9e1a8d3&camp=1789&creative=9325
Amazon.ca amazon.ca/?&_encoding=UTF8&tag=gadgetreboot-20&linkCode=ur2&linkId=70fa82315ac48f03342938bd4fb93535&camp=15121&creative=330641
Videos are mirrored at LBRY/Odysee: odysee.com/@GadgetReboot:4
#ElectronicsCreators
