This transistor amplifier was published in Radio Electronics magazine in July 1965. It used newly released silicon transistors with excellent sound quality.
This conventional window comparator configuration was found in an old documentation. It is valid...
This sonic relay or vox was found in a Popular Electronics from the 90's. The power MOSFET can be of...
This high voltage circuit was found in a 1970 documentation. The integrated one is of the time and...