This is Analog signal selector switch. Do not waste time, choose the input method with interchangeable input cables. But press the input selector switch, as you like.
Easy and cost effective alternative is Input selection switch. With features the optional four-channel signal input. and volume to Increase or decrease the signal. In the event that your power amplifier no volume.
How This Circuit works
Figure 1 the analog signal selector switches circuits
From circuit in Figure 1 a selector switches(S1) will be selectness a input signal of 4 inputs, put it to work only one input channel. And three other channels of the remaining, S1 short circuit to ground immediately, Which there are R1-R16 and C1-C8 serve as directly the short circuit protection devices to the ground of signal input channel that is not being selected. To makes the CD player or various devices that bring the connection at J1-J8 input, not damaged by short-circuit of S1.
The signal input is selected will connect into VR1, which will be volume that adjustable the volume level of signal input before into J9-J10, As output is selected out off to the power amplifier or various devices.
How to builds.
Figure 2 show PCB layout Size of the prototype reality that we prepared before, and Figure 3 is a model of all components and the signal input panel selector switch. Which will see that has a few components. But must I have to be careful to solder the legs of S1. Because the copper line between the leg switches. Should be careful not to shock the pin of switches or, short to ground.
When the need will hear the sound from the source, press the selector switches on the location. We will see that this project is built. However, given the convenience, quick, cost really.
The components of List
Resistors ¼ watts + 5%
R9-R16: 330 ohms
C1-C8: 150pF 50V
S1: Push selector switch is 4 set.
J1-J8: RCA female jack to PCB 2 channel.
PCB 1 pcs. volume knob.