The Museum of HP Calculators
HP Forum Archive 06
[ Return to Index | Top of Index ]
Message #1 Posted by Tony Duell on 7 June 2001, 4:41 p.m.
According to the manuals I have (HP71 Hardware IDS, for example), it's not a 3 terminal regulator, it's a simple NPN power transistor.
It's used in the standard zener diode + emitter follower circuit, and it's the zener diode that sets the output voltage. The transistor is not that critical.
Alas the parts list in the manual simply calls it a 'Transistor, NPN' -- no equivalent is given. But I think that just about any small power transistor should work.
Return to Index | Top of Index ]
Go back to the main exhibit hall