This circuit was obtained in an Electronics World of 1968. The operational amplifiers ones are types of the time, no longer used today. The circuit responds from less than 20 Hz.
This circuit was found in a Linear Technology manual from the 1990s. The circuit makes use of the...
This circuit can be used as part of a Vox project or as an input shield for a microcontroller that...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...