This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very common today. The power supply must be symmetrical.
This circuit was obtained in a 1984 publication, but it can be assembled using BC548 for TR1 and...
In the figure we have an IF amplifier step using a MOSFET. The circuit was found in a 1980s...
This high impedance driver was found in a 1980s documentation. The integrated circuit is a type of...