iz8dwf | Restoring the DCD AC.350.OM acoustic coupler pt. 1: mechanical problems & component testing @iz8dwf | Uploaded December 2018 | Updated October 2024, 57 minutes ago.
Restoring a DCD model AC.350.OM acoustic coupler, S/N 350/381. This one was probably made during the first half of 1974. It's an originate-only V.21 FSK modulation 0-300 bps modem, built only with almost all analog electronic circuitry.
In this first part, I restore a few broken connectors on the backplane, test the power supply board and substitute a suspect transistor with too high junction voltage drop.
Part 2 & 3:
youtube.com/watch?v=4-StGVDZzXA
youtube.com/watch?v=V3nH4li8MjA
Restoring a DCD model AC.350.OM acoustic coupler, S/N 350/381. This one was probably made during the first half of 1974. It's an originate-only V.21 FSK modulation 0-300 bps modem, built only with almost all analog electronic circuitry.
In this first part, I restore a few broken connectors on the backplane, test the power supply board and substitute a suspect transistor with too high junction voltage drop.
Part 2 & 3:
youtube.com/watch?v=4-StGVDZzXA
youtube.com/watch?v=V3nH4li8MjA
