The DJ Switcher.




This is an electronic input switcher for amateur DJ’s who are running short on inputs on the audio mixer.
It allows you to connect 2 inputs to channel 1 and 2 each, and 3 inputs to channel 3.
Each input channel has a toggle switch and 2 or 3 LEDs indicating the active input.  The actual switching is done using DPDT relays driven by Arduino (AT328p)  via a simple 2N222A or even BD547 NPN transistor.   It also has a potentiometer in A0, which drives  a BD139 NPN Darlington transistor using PWM, allowing you to  regulate the brightness of an LED strip that illuminates the mix table.
Button 1 switches between inputs 1 and 2  on channel “A”    (and lights up the corresponding LED)
Button 2 switches between inputs 3 and 4  on channel “B”    (and lights up the corresponding LED)
Button 3 switches between inputs 5,6 and 7  on channel “C”    (and lights up the corresponding LED)
A 4th push button allows you to quickly reset all relais to default, making inputs 1,3 and 5  “live”
An extra LED will blink each time you press a button, to confirm your command.  (Blinker)

Picture Gallery   (build pictures)

The Arduino script (sketch in *.ino format)




minidj.ino

Download File

External connections between main PCB and LEDs, Relays and Buttons.

External connections between main PCB and LEDs, Relays and Buttons.

Schematic Diagram for the connections

dj_switcher.dsn

Download File

Schematic Diagram for the connections

The Project in action (movies)




Leave a Comment

*
= 5 + 7

(Spamcheck Enabled)

Read previous post:
The schematic diagram
CCTV camera controller.

This project allows you to build you own  CCTV switchbox, that you can use to connect up to 6 cameras...

Close
Scroll to top