This interesting circuit for the RDA8851 allows you to obtain two volumes with a simple touch. The circuit is from an Electronics Now from December 1988. Note the amplifier voltages.
We find this circuit in a documentation for engineers from 1971. The circuit generates rectangular and...
Found in General Electric documentation from 1967, this circuit uses an unusual PUT today. The...
This circuit, which uses a VU-meter with zero in the center of the scale, which is not easy to...