Although it uses a dual-channel FET, which is hard to find today, this circuit was released in a Radio Electronics issue in April 1986. It serves as a signal booster for a wide range of frequencies.
This filter has the components calculated for the frequency of 1 kHz but can be changed. The input...
This capacimeter was obtained in European documentation from the 1980s. The indicator instrument, a...
This circuit was found in the Optoelctronics Sourcebook from Texas Instruments. The circuit has a...