![]() Even stuff like inductors and transformers are fully implemented, which is pretty neat. It does use "ideal" models of components, but they're competent models none the less. I mainly use iCircuit on my iPad when I'm away from my computer and want to put an idea down, or just kind of spitball with a theory or problem I'm working on. ![]() I also didn't care for the way you hook things up and add parts to the schematic. It seemed very, very basic on the surface. Once I got into the simulator, I didn't like it very much. I was really put off with it trying to force me to register an account with them. I recently saw Everåircuit on the App Store and decided to check it out. Most precision DMMs don't rely on the op-amp's input diodes and instead will use some sort of ultra low leakage (2V ranges, the input impedance is 1M-10M so there's even less current to deal with. Why? Well, the inputs of the op-amp have ESD diodes connected to VCC and GND that will shunt the excess voltage away, and, since it's current limited by the input impedance, will be able to handle it. The maximum amount of current the op-amp's input would be subjected to is ~1.7mA, which isn't nearly enough to damage it. Let's also say 1000V is applied to the input in this range. Generally at the input there's a relay to switch between the 20V ranges. Quote from: timb on March 20, 2016, 03:33:25 am Basically, the reason the buffer/amplifier/ADC don't blow up when you apply 200V while it's in the 2mV range is because of the very high input impedance. Here's two visual examples: 1kV Applied to the 2V Range 1kV Applied to the 1kV Range ![]() Basically, the reason the buffer/amplifier/ADC don't blow up when you apply 200V while it's in the 2mV range is because of the very high input impedance.
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