HP-19C Repair Odysee
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05-11-2021, 12:45 AM
Post: #42
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RE: HP-19C Repair Odysee
Yes, the pixel length will change if just changing the actual pulse width for them.
I used the mathematical formula that HP used for the motor/head driver. The controller uses this to determine the PWM signal. I wasn't sure of the gain of the driver transistors as I cannot find data on them, (I thought something like PN2222) but if it is quite low I wasn't sure if the PIC could drive all of them directly. I figured the PIK chip might have some internal resistance to limit base current. cheers Tony |
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