01-02-2016, 07:27 PM
Got the audio switcher on the bench. Establshed how the ins and outs are wired u which wasn't immediately obvious. Found one of the 4042 latches merrily singing away for no good reason. Swapped it with another to prove it was faulty. I have some spares in my junk box.
The designers have been rather naughty. The 4051 analogue switches are being run on +/-12V, that's 24V between VDD and VEE. Data sheet says abs max is 18V. Tut tut.
The designers have been rather naughty. The 4051 analogue switches are being run on +/-12V, that's 24V between VDD and VEE. Data sheet says abs max is 18V. Tut tut.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
