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 uses only transistors, producing a pseudo-sequential effect with 6 LEDs. The circuit is...
This is a change from the previous interface, also used an uncommon operational one today. The...
This hysteresis comparator was found in the 1994 National Semiconductor Linear Applications...