Quite noisy module because of low power TL-064 used for amplifiyng the signal. But this can be improved with any quality OpAmp having same pin-out. I've tried OP470, but it's very expensive IC.
Mixer (Logarithmic)
http://www.doepfer.de/a138.htm
Quite noisy module because of low power TL-064 used for amplifiyng the signal. But this can be improved with any quality OpAmp having same pin-out. I've tried OP470, but it's very expensive IC.