BLS Power Supply

Modification History

• 1990-Added a cap to the collector Q2 on the logic board to suppress a parasitic oscillation.
• 1992-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.
• 1992-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.
• 2000-Reworked crate power wiring harness.
• 2001-Replaced crappy inline ATO-fuse holders with circuit breakers and 3AG fuse holders.
• 2002-Added ventilation holes, front and back. Begin addition of small fan to front panel hole. Added handles to the back panel.
• 2003-03-Begin addition of R302 (3.6K) and bypass cap (0.1uf) on circuit trace per note H030331.doc.