well for q3 i will use an opamp inverter, is that okay?
Thats OK, something better than a 741 if possible.
im sorry i didnt understand the linking resistor part?
No problem, its easier to draw a rectangular box than a zigzag resistor.
is the red 5V suuposed to be 12V
On your drawing you show a 555 with a 5V supply, I was just trying to keep the drive transistor the same.
or is it part of the BJT inverter that you meant to use?
It just powers the invertor.[/QUOTE]
What college year is this project for.?
Hi,
If its easier the 555 can run at 12V, as can the BJT invertor, just calculate the appropiate resistor values.