This balance control for the channels of a stereo system was found in a 1969 Mullard documentation. The transistors may be the modern BC548 equivalents.
This circuit goes into operation producing a sound on a small speaker when the supply voltage...
We found this circuit that protects speakers against current surges that occur when the amplifier is...
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...