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Home Forums 68kMLA Unusual 512K Analogue Board Upgrade Kit — #2
Post #2 by JDW
Source Forum68kMLA
Category68k
Post DateSat, 29 May 2010 - 13:55
Original URLhttps://68kmla.org/bb/threads/unusual-512k-analogue-board-upgrade-kit.20657/
Post
Thank you for this link, Mac128.

I found the most interesting aspect to be in the auction's Schematic of the Vertical Sweep Section. For sake of comparison, have a look at the schematic in Figure 3 on page 5 of Tom Lee's Classic Mac Tech Info pdf. Specifically, note where the Emitter of Q4 connects, as well as the (-) side of CR7. On Tom Lee's schematic, the (-) side of CR7 is tied to +12v along with the Emitter of Q4. But in the schematic presented in the auction (created by Soft Solutions, I am assuming), the Emitter of Q4 goes to +12v but the (-) side of CR7 goes to Ground.

mp.ls