Originally Posted by AB-737
I'm trying to build this and I'm a bit confused... You state to pick up 3 resistors and 2 caps from Rat Shack... yet in your image of your circuit I see 3 caps and 2 resistors...
I'm also building this circuit. As per the timer circuit in the diagram, there are 3 resistors used. 2 build a voltage divider that then feeds pin 7. The other is to attenuate the timer output on pin 3 before it goes to the ECU. What is a bit confusing to me is the rest of USB portion of the circuit. The EHR-5 header and part where the 10uF cap goes is confusing me.
Here is what I've built so far.
Timer circuit is working properly.
What I find particularly confusing is that in the schematic, they use the pinouts for the FTDI chip on the DLP-USB232M board, instead of the pinout for that board.
However, after reading through the documentation from DLP Design, I think I have it working. I will be testing this tomorrow on an 04 STI ECU.