[time-nuts] HP10544a Technical Info needed
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sat Feb 3 10:17:53 UTC 2007
Lester Veenstra M0YCM wrote:
> I have a bad 10544 (received from AST) that I am planning to look into.
> No 10 MHz out and very low 12 VDC current.
> Has anyone the translation from HP PN to Commercial equiv for the
> semiconductors ?
> Thanks
> Les
>
> Lester B Veenstra
> M0YCM K1YCM K1YCM/6Y5
>
> Mail Address:
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> Lester Veenstra
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> APO AE 09468
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Lester
A parts conversion list is available at
http://www.hparchive.com/PARTS/300-hpxref.pdf
The part numbers on the circuit schematic are somewhat abbreviated.
54-215 = 1854-0215 = 2N3904.
53-20 = 1853-0020 = 2N3905?? my guess this should work. but stick a
ferrite bead on the base as this device may oscillate with all 3
terminals AC grounded.
26-59 = 1826-0059 = ?? some low bias current opamp with external
frequency compensation LM208??
3-347 = 1853-0347 = MJE700 PNP power Darlington
4-560 = 1854-0560 = MPSA12 NPN small signal darlington
5-10 = 1853-0010 = 2N2646 unijunction transistor
01-535 = 1901-0535 = Silicon RF detector diode probably not Schottky.
02-033 = 1902-0033 = 1N823 6.2V temperature compensated zener reference
diode.
Bruce
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