jim wrote:
with the venerable 2n3055 (1960s!) as the series pass device, and an
exotic TIP29 (my 1985 databook has it, but the original datasheet says
1968) to drive it..
They probably used the 1970s versions of the transistor, of course,
since the 723 didn't come out til early 70s..
Fairchild introduced the orginal 723 (the µA723) in 1968. I think
National brought out the LM723 within the year, but can't swear to it.
While the schematic I posted shows a TIP29 driver transistor, that was
for a different, 3A supply. The lower-current +/-12v supplies in the
HTAA-16W-A do without the driver, and connect the 3055 directly to the
723 output (which can source up to 150mA). The schematic I posted also
shows foldback current limiting, which the +/-12v supplies in the
HTAA-16W-A do not have.
Best regards,
Charles
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