Don wrote:
I`m looking at the circuit of an HP10544 oscillator - can anybody confirm,
please, if the HP transistor types 53-20, and 54-215 have commercial
equivalents?
54-215 (full HP part number 1854-0215) is the ubiquitous 2N3904.
53-20 (full HP part number 1853-0020) is 2N3702. 2N4403 is an
equivalent if 3702 is hard to find.
Also, note that the HP schematics of the 10544 have some errors that
were (as far as I can tell) never corrected by HP. I posted a corrected
and annotated schematic to Didier's site (ko4bb.com). Here's a link:
<http://www.ko4bb.com/getsimple/index.php?id=download&file=HP_Agilent/HP_10544_Crystal_Oven_Oscillator/HP_10544A_schematic_further_corrected_and_annotated.pdf>
Best regards,
Charles
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