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.
Found in a Popular Electronics from the 90s, this circuit generates a signal that depends on the...
This circuit was obtained from old documentation, triggering when there is a power cut on the...
A passive mixer with few components is that of the circuit shown, found in a 1982 documentation. As readers...