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.
This type of circuit appears in several versions and approaches on this website. This was found in a...
) We found this circuit in a 1988 documentation, but it uses components that are still common...
This circuit is designed to control static loads fed by direct voltage. The circuit is from...