Unusual 512K Analogue Board Upgrade Kit — #5

Post #5 by tomlee59

Source Forum	68kMLA
Category	68k
Post Date	Thu, 3 Jun 2010 - 23:01
Original URL	https://68kmla.org/bb/threads/unusual-512k-analogue-board-upgrade-kit.20657/

Post

I linked to version 1.1 of Tom's Lee's PDF by mistake in my previous post above.
Here is the link to version 2.0. In the version 2.0 PDF, the discrepancy in the schematic appears in Figure 11 on page 18. And once again, here is the auction schematic. When comparing the two schematics, note the area of Q4 (2N4401), located toward the bottom of the schematics.

Any thoughts on this, Tom?

Thanks for comparing the two so carefully, JDW. It looks as if the difference is in our labeling of CR7 and CR8. Other than that, the schematics seem to agree (at least in that neighborhood of circuitry). I wouldn't be at all surprised if I transposed those labels by mistake.