2 ms·
Very cool article. I found myself strangely hit with a wave of nostalgia when the piece came upon "DTMF: dialing a Touch-Tone phone"
by jxramos 9y ago
Very cool article. I found myself strangely hit with a wave of nostalgia when the piece came upon "DTMF: dialing a Touch-Tone phone"
- hammock 9y agoAnarchist cookbook, blue box, buzz box, etc...
- a1k0n 9y agoDon't forget the red box, which you could make by replacing the 3.579545 MHz crystal powering the chip that the OP reverse engineered with a 6.5536MHz one, and then the top row and bottom column tones become 1700 / 2200Hz to simulate the pay phone nickel / dime / quarter tones.