@gunrunnerjohn posted:...
One bonus of doing your own board and soldering the sensor is you can get it the right height. Many times I have to unsolder the sensor and reposition it.
I was looking at a PS2 tach board on an open engine and it has the sensor chip flush on the board (photo above right). Yet, on the OP's photo the sensor chip is clearly off-the-board quite a bit with some kind of "foam" spacer:
Since the old sensor chip needs to be replaced anyway, here's a one-off idea that may allow the existing board to be used AS-IS with only a modest amount of wire/lead bending...and still account for the change in pin-out between the EE-SY124 and the QRE1113.
The Idea is to notice that the PS2 board connects the A and C pins of the sensor chip together (and this then goes to the Gray wire). This A=C connection can be used to advantage as it then makes the 4 sensor holes in the correct orientation for the QRE1113. Yes, the 4mm x 1.75mm is now 1.75mm x 4mm but I think that can be worked-with since the chip is above the board (would be more difficult if chip is flush to board as in my photo). The 4 terminal leads could be clipped close to the sensor chip leaving 4 wires sticking up; the QRE1113 chip would then be soldered to the 4 stand-up wires. Not sure this makes any sense!
But if it does work out, I'd think there would be future application for guys who need to repair one (1) PS2 tach board.
