This step of good gain was obtained in an American publication of the 1980s. The circuit can be powered by voltages from 3 to 9 V and the FET can be of almost any type.
The integrated circuit used in this project is unusual. We found this configuration in Motorola's Linear...
This circuit with only one transistor was found in Japanese documentation from the 1960s. The...
The operating frequency of this circuit is 465 Hz and the input voltage is 12 VAC. The circuit is...