The circuit shown in the figure below is from the 1993 Linear Technology Applications. The operational ones used are uncommon and the use of equivalents can be analyzed.
With only one integrated circuit and few additional components, this amplifier has an output power...
For the 7 to 10 MHz band L1 is formed by 3 turns of 22 to 28 AWG wire in a ferrite core 15 to 20...
The circuit shown in the figure, activates a bar of 4 LEDs with an audio signal applied to its...