The audio channel selector is made on high-quality relays with platinum-plated contacts:
RY-12W-K with extremely low resistance.
A distinctive feature of this selector is the switching control with a low-power button without locking (a clock button), which can be very beneficial from an aesthetic point of view in the finished device. There is an LED indication of the currently activated channel.
The principle of operation is based on a logical microcontroller: when power is applied, 1 channel is automatically switched and the LED indicator of 1 channel lights up. By briefly pressing the button without fixing, it switches to 2 channel with indication of 2 channels, etc. When the last channel is on, pressing the button will switch to 1 channel. When you turn off the power and reapply, 1 channel is always connected.
Optionally, the module provides the ability to short circuit channels that are not currently used, to the ground.
The board is equipped with a power supply and allows the connection of both direct and alternating current with a wide range:
Supply voltage variable from 10V to 23V
Supply voltage constant from 12V to 34V
Modules with a reduced number of channels are made to order:
4 channels
3 channels