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 circuit was obtained in an Electronics Now of the 90s. The circuit monitors the DIN connector of...
Found in a 1965 Motorola documentation, this circuit uses a neon lamp as a trigger element. The SCR...
The outputs of each switch position are determined by the zener voltage plus the drive voltage of each...