BLS Power Supply
David L. Huffman
Added a cap to the collector Q2
on the logic board to suppress a parasitic oscillation.
Added a latch circuit to the External Interlock signal
. Without this latch we had a failure of the soft-start resistors when the Ext. Int. signaled oscillated.
Added 1 Ohm resistors to the Control Power board
to lower the in-rush current on the raw 24V
1994-Added protection diodes to the three-terminal regulators on the Control Power Board.
1999-Rebuilt supplies for higher current and voltage rail changes to accommodate new electronics.
Changed the logic board
to turn all outputs off if any single output faults.
Reworked crate power wiring harness
Replaced crappy inline ATO-fuse holders with circuit breakers and 3AG fuse holders.
Added ventilation holes, front and back. Begin addition of small fan to front panel hole
. Added handles to the back panel.
Begin addition of R302 (3.6K) and bypass cap (0.1uf) on circuit trace per note H030331.doc