On my Weishi No 1000 timegrapher, the preamp uses a Ti 2272C, wich is powered by +8V. I bought a DIY adapter for Weishi microphone and PC, in order to have the benefits of Weishi microphone stand and graphic display of TG software. -With Weishi microphone stand, I like to test the watch or the movement in all positions, safely. -With TG software, I like the details provided by the PC screen, and to "see" the sound from tic toc The adapter has an USB powered 8v power supply, a TRRS
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