This balance indicator for stereo amplifiers was found in an 80's Elektor. The components used are common. Zeners are 1.8 V or close to that value.
In the figure we have the use of one of the four existing amplifiers in the LM2900 and LM3900 as a...
We found this circuit in a 1975 publication. The power supply must be symmetrical, but other...
This circuit was found in old documentation. PUTs are uncommon components today. The circuit...