Hi, I am using a T network with a current to voltage convertor op amp circuit in order to switch between 2 gain values. I have an NPN transistor controlling the connection of the bottom of the T to ground. Through experimentation I have found that the set up works best when the cellector is grounded and the emitter is connected to the resistor. This seems strange as the transistor should be connected the other way round, should it not?. Also I have seen a similar circuit in another forum thread where the same idea is used, this time using an n channel MOSFET to control the switching, and with the Drain connected to ground instead of the source.
can anyone tell me why these circuits seem to work even though the transistors seem to be connected the wrong way round??
i was thinking of changing anyway from a transistor to an analogue switch but it would be good to understand why the transistor seems to work
can anyone tell me why these circuits seem to work even though the transistors seem to be connected the wrong way round??
i was thinking of changing anyway from a transistor to an analogue switch but it would be good to understand why the transistor seems to work