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Thread: Cromemco 8K Bytesaver transformer question

  1. #11
    Join Date
    Jan 2007
    Pacific Northwest, USA
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    Um, isn't that what fuses are for?

  2. #12


    Quote Originally Posted by Dwight Elvey View Post
    Looking at the schematic, I'd say 1 & 4 are the feedback. 3 is the bottom of the output coil, 2 is the center ( may be offset towards 3 ) and 5 is the top of the coil.
    3 and 4 could be swapped but it makes little difference.
    Giving some more thought, the feedback winding might be from 1 to 2. The power winding from 2 to 3 and the output from 4 to 5.
    That sounds better. The additional winding 4 to 5 would be to keep the flyback voltage low, on the transistor. The feedback is capacitor
    isolated so pin 2 is essentially ground through bypass caps.

  3. Default

    Quote Originally Posted by Chuck(G) View Post
    Um, isn't that what fuses are for?
    You know the saying "A Transistor Protected By A Fast Acting Fuse Will Protect The Fuse By Blowing First"? That goes double for the TI switcher IC on that board. My solution prevented further disruptions to EPROM production and located the defective component, so I'll call it a success.


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