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i used the same schematic for the Mazda, 1*LM3914 2* 7414 2*4066. my problem is everything its okay when the jack is not plug in the stereo, when i plug it i got just 2 buttons correct the others are completely wrong, any idea please, i used i diode still got the problem
Using the diodes to combine two outputs did not work, that is why they are scored out in the schematic sketch.
There have been other discussions about my circuit, have a look here:
where you will find the final version of the circuit.