Hope one of you analog designers can look this schematic over and explain to me how it works, or if it's just plain got errors in it. I've been studying it a while and I just don't quite get all the signal going 'round and 'round. It doesn't look like any textbook State Variable Filter I've seen, or a Bi-Quad design either. I think it is supposed to be a bandpass filter of some kind.
It's supposedly a lower noise design for use with electric guitar signal level and can be used with well over the common 9v. battery - up to 30 volts.
The setup with the first two op amps doesn't make sense to me with where the output is taken, especially because it is labelled "GAIN".
It's supposedly a lower noise design for use with electric guitar signal level and can be used with well over the common 9v. battery - up to 30 volts.
The setup with the first two op amps doesn't make sense to me with where the output is taken, especially because it is labelled "GAIN".