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HP Forums › HP Museum Forums › Old HP Forum Archives v
HP 67 battery charger

Linear Mode
HP 67 battery charger


▼
Paul Davis Offline
Unregistered
Posts: 1
Threads: 1
Joined: Jan 1970
#2
04-18-1999, 09:28 AM

Can anyone provide a specification or circuit diagram for building a battery charger for the HP67?

Many thanks,

-Paul

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▼
DaveC Offline
Unregistered
Posts: 90
Threads: 2
Joined: Jan 1970
#3
04-18-1999, 05:13 PM

I'd actually buy an existing stabalised supplyand change that. The only additional component you need is a current limit resistor and a power diode. The important operating voltage is that that runs the calculator which needs to be set accurately at 3.75 to 4 volts. The additional diode and resistor can be used to form a charging circuit direct from the secondary of the transformer. I'd choose the resistor to pass C/10 to C/15. (C=Capacity of cell).

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▼
DaveC Offline
Unregistered
Posts: 90
Threads: 2
Joined: Jan 1970
#4
04-18-1999, 05:14 PM

Also see http://www.hpmuseum.org/batts/battery.htm

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