Sir Donald Henderickx . . . . . . . . and thats being
HEAVEE on the
DER and
KX . . .
I highly suspicion some sections of the old workhorse LM324 being used for your mystery I.C.
Check this pin out, if it’s being a DIP package.
You test all four sections by DC voltage monitoring of an output pin of 1-7-8 or 14 and take a 4.7 or 10 k resistor from +9VDC to one and then the other input pins of that specific op amp.
Then you should experience a voltage shift at that units monitored output.
Your feedback of 7 being connecting to 10 is indicative of units 2 output and 3's input being utilized while, possibly, units 1 and 4 just possibly may not even be utilized.
Now . . . . . check it ooooooooo uuuu t t t t t !
https://www.elprocus.com/wp-content/uploads/2013/06/LM324.jpg
Hello Edd
Here are my observations. It is a 14 pin dip package.
I am using a simpson 260 minus to pin 11 + to ic outputs
The vcc measures 12 v
out 1 , 6.2 v pulls down to .75 with 4.7 k to -input ,up to 7.6 4.7k to +input
out 2, 6.2v pulls down to .75 with 4.7 k to -input ,up t0 11v 4.7 to +input
out 3, 0v no change 4.7k to inputs
out 4, 6.2 volts no change 4.7 k to -input, up to 11v 4.7k to +input
hope this makes sense
Don H
73’s De Edd