View Full Version : IBM PS/2 Model 25 Earphone to Line Level (For Trixter)

October 4th, 2017, 09:54 AM
I made this video primarily for Trixter, but it'll benefit anyone honestly.


One resistor, 33k ohm, is enough to get it line level.

Sorry it took so long to do this! I lost my breadboard, and my carton of resistors, and it took me a while to find them.

October 4th, 2017, 10:15 AM
Ideally, you'd want something that preserves the load impedance, so perhaps an L (https://en.wikipedia.org/wiki/L_pad) or T (https://en.wikipedia.org/wiki/T_pad) resistor arrangement. Same idea.

October 4th, 2017, 11:57 AM
Yea that would be ideal, but I don't think it's going to really be that critical in this application. If we were at like 1-4 ohms I'd be concerned, but the impedance is so high I don't think it'll be much of an issue for a quick sound capture.

October 4th, 2017, 01:35 PM
Much appreciated! Hope to try this out during the weekend.