This sensitive 5-band circuit was found in a September 1995 issue of Electronics Now magazine. The headphones, for greater sensitivity, should be high impedance.
This circuit can be implemented with other operational ones. We found it in documentation from the...
August 2017 - Texas Instruments is announcing the availability by Mouser Electronics of its new...
This circuit was obtained in a 1979 publication, but it can be assembled with the BD135 instead of the...