On Wed, Feb 5, 2025 at 06:28 AM, Tony Casey wrote:
There are some situations where it is very difficult not to use actual GND, even implicitly. The digital (A) devices are an example. They have a hidden "device common", so the outputs can source current, apparently from nowhere. ...
That can easily be avoided too, if you know you want to.
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Technically, the "hidden" connection is to a not-hidden pin on the A-device symbol's lower left corner.? If the pin is left floating, which is the normal way to use them, LTspice makes a hidden connection to node 0.? If the pin goes anywhere on your schematic, the connection to node 0 is broken, causing the output currents to be sourced from something other than node 0.
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Andy
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