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.
The circuit we show is part of an article that taught its complete assembly. The article is from...
Found in American documentation from the 90s, this circuit has a timing system for activating the...
This circuit was obtained in a 90s Popular Electronics. It generates a 10 Hz sinusoidal signal...