hello all,
last moth i succeeded in making a tachometer for my car.i used LM2917 and LM3914 as the f-v converter and LED driver.
this time i want it for my motorcycle.as the indicator panel is quite small,i want to make the tacho circuit quite compact.
while searching i came across this site,where i found the TACHO built by PIC16f877.
**broken link removed**
iam not very good at PIC stuff.
can you guys clarify my doubts.
1.can i use pic16f877A instead of 16f877.what does this A stand for?
2.in the LM2917 circuit,i used some resistors and capacitors at the frequency input.(for filtration i guess ).but this circuit uses only a pot is it safe?
3.in the circuit pin 1 is directly connected to 5vdc.i think it shld be coupled by 10k resistor.am i right?
4.the LEDs are connected in sourcing method(common ground).how can i change it back to sinking connection(supply common).so that it will protect the PIC
5.the author said the pot has to be adjusted so that MAX 5v should come in.how can i do that.
sorry if my questions are too long.pls help me clarify the doubts.
i'll be thankful.
regards