I'm in the midst of learning circuit design, and trying to get some practical experience, taking a simple circuit and walking through what each piece does to understand it.
So I picked up the Velleman MK136 Super ear kit. Schematic here: http://www.vellemanusa.com/downloads/0/minikits/manuals/manual_mk136.pdf
I'm trying to understand what purpose R5/R6 (Top near opamp) perform. Looks like a voltage divider circuit, but the sine wave from the mic side is also passing through it.
Is this effectively adding 2.25v to the mic circuit (Assuming a 4.5v supply)? Is there a name for this type of circuit?
So I picked up the Velleman MK136 Super ear kit. Schematic here: http://www.vellemanusa.com/downloads/0/minikits/manuals/manual_mk136.pdf
I'm trying to understand what purpose R5/R6 (Top near opamp) perform. Looks like a voltage divider circuit, but the sine wave from the mic side is also passing through it.
Is this effectively adding 2.25v to the mic circuit (Assuming a 4.5v supply)? Is there a name for this type of circuit?