fastbike
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lm2965
I'm building a replacement remote control unit around a PIC16F88 chip.
The data sheet shows supply voltage must be between 4.5 and 5.5V.
The RC case I'm using holds 4xAAA batteries. If I use alkaline cells, my voltage will vary between 6.5V (briefly when new batteries are inserted), through 6V in normal operation and finally drop below 4.5 when the batteries are exhausted.
I thought of using a diode to prevent against incorrect polarity (dropping 600mV). Will this voltage drop will mean the 4.5V limit is reached earlier or are the batteries at the end of their life anyway ?
Should I use a 5v1 zener or a 7805 to limit the voltage to 5v ?
Look forward to hearing what others do !
I'm building a replacement remote control unit around a PIC16F88 chip.
The data sheet shows supply voltage must be between 4.5 and 5.5V.
The RC case I'm using holds 4xAAA batteries. If I use alkaline cells, my voltage will vary between 6.5V (briefly when new batteries are inserted), through 6V in normal operation and finally drop below 4.5 when the batteries are exhausted.
I thought of using a diode to prevent against incorrect polarity (dropping 600mV). Will this voltage drop will mean the 4.5V limit is reached earlier or are the batteries at the end of their life anyway ?
Should I use a 5v1 zener or a 7805 to limit the voltage to 5v ?
Look forward to hearing what others do !