ORIGINAL: azalner
I have been following this thread with some interest and based on the most recent posts I think I am ready to bite the bullet. First let me say that the intended application is an RC airplane engine (CRRC 50cc). The 300 to 9700 rpm range is spot on. Based on previous postings attached is a schematic of the circuit I propose. I have a few questions for the RC guys.
1. I am considering building the timer board and power board separately.
http://www.electronics.gompy.net/cditci/
The timer board would be in the receiver compartment and powered from the receiver batteries. The power board would go up front with its own battery. Any comments?
No problem, the timerboard don't use much current, it's the HV=powerboard wat cunsume.
2. Has anyone encapsulated the boards in epoxy''
Don't doit, epoxy will break the components away from the PCB.
Use silicon or other flexible kits.
3. I haven't been able to figure out where pin 4, 12 and 13 go on the PIC. Can anyone help?
Thoose pins are used for in circuit programming.
If you put the hole pcb into flexible kit, its impossible to reprogram the pic if you don't have this pins.