This circuit can be used as an amplifier for musical instruments or even with your cell phone. The circuit is old and was found in the 1990 edition of Radio Electronics Experimenter magazine.
This other photodiode amplifier uses an operational amplifier in the non-inverting mode and in the...
This circuit was found in an English magazine from 1977. The critical component is the gas sensor....
This project makes use of a technology without many digital components and that can be easily...