Quote:
Originally Posted by soundman98
what's weirding me out is how the 'out' and negative pins are tied together on the HPF section. almost like it's converting a positive input signal to a negative signal for the pioneer amp chip...
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Are you referring to what would be RF in the diagram below? If so, if I recall correctly, RF (the Feedback Resistor) in an op-amp circuit is used in conjunction with RG (Gain Resistor) to determine the overall gain of that stage. If RF is zero (a short circuit, just a piece of wire) it sets the gain to unity or "1". This would be appropriate for a buffer stage or one that is doing signal shaping (filtering, tone control) rather than an actual "pre-amp" function. By connecting Vout back to the inverting input they are creating "negative feedback" which makes for a very stable circuit configuration.