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.
June 2017 - Texas Instruments' new TPS61178x synchronized boost converters that already include...
Found in a 90’s Popular Electronics, this circuit uses a component that can be difficult to obtain...
This circuit was found in the National Semiconductor Linear Applications Handbook, published in...