HP97 The journey begins
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02-06-2020, 02:32 AM
(This post was last modified: 02-06-2020 02:36 AM by teenix.)
Post: #207
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RE: HP97 The journey begins
(02-06-2020 01:44 AM)Helix Wrote: Thanks! 3.6-5.0V is ok for all CPU boards. There are voltage regulators after the battery voltage boost circuitry that will keep the original card reader/display circuitry at their original voltages. 4.5 was an arbitrary safe value. The original 67 was not supposed to be used while the charger is on without batteries, so I would suggest not using the modules while battery charging, unless the charger voltage that feeds the calculator circuitry is <= 5V. With 0.00 showing on the display and 4V battery... Current for the 65 is 138mA (orig) vs 84mA The 67 is 165mA (orig) vs 65mA. The 55 new is 76mA with PIC oscillator driving the anode driver Active Bluetooth will add about 8mA. cheers Tony |
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