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Print Search. Author Topic: Help needed with IC substitution problems Read times. I'm sure there's something basic that I am missing here, but I've come to a blank trying to get this to work. When I made this circuit with the LF, it worked perfectly but with the same circuit adjusted to use the TCBP, it's just not working..
I've included the original and new schematics below, along with datasheets of both parts. If someone smarter than me can take a look and tell me what I'm doing wrong, that would be greatly appreciated. The first attachment is my revised schematic, the second is the original HP schematic. HP A Opt V1. Option Schematic a. TCB Datasheet. LFD Datasheet. Any circuit design must contain at least one part which is obsolete, two parts which are unobtainable, and three parts which are still under development.
Hi, I can tell you what is wrong. It may take a little while to come up with a solution. The TC is limited to 20V max operation. The switch pins have to be inside the rails for the switch to work. In your design you are shorting the 6V3 rail to ground through substrate diodes in the TC Save the world.
DG may work as a substitute for the LF Hi, I was going to suggest ADG Similar to oPossum's suggestion. Aaahh, I knew the devil was in the details somewhere Thanks for the info, I'll take a look at those suggested substitutions and see what ones I can get easily here. Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.
Warren Buffett. There was an error while thanking. SMF 2. EEVblog on Youtube.
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TC4066B Quad Bilateral Switch
TC4066 T, TC4066AF, TC4066BE
TC4066BP SWITCH. Datasheet pdf. Equivalent