Building A Discrete Component 75 Baud Modem

A hobbyist known as sv3ora built a discrete-component modem using BC547 transistors, diodes, resistors, and capacitors to support 75 baud serial communication on the CB2 Micro, whose V1.54 firmware enabled that speed. The modem modulates data to audio and back, letting the CB2 Micro communicate over phone lines, ham radio, or cassette tape, and was demoed storing and retrieving a program on tape.

Source: https://hackaday.com/2026/08/21/building-a-discrete-component-75-baud-modem. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.