UB 10 Band Graphic Equaliser
Here I present my self-designed 10 band graphic equaliser. The conditions I have imposed on myself are 10 bands and an operating voltage of 9 volts. I did some research on the Internet and came across the BA3812L chip. With one chip you can create a 5 band equaliser and with 2 chips a 10 band equaliser. It would have been nice if it could have been fitted with sliders, but the cost of cutting slots in an aluminium housing was over 100 euros for one piece. That was definitely too expensive for me and I thought about doing it with normal rotary potentiometers. No sooner said than done. I created a circuit board and had it professionally manufactured. If anyone is interested, I will be happy to sell the more produced ones for 12 euros each.
After some time of waiting, the circuit board finally arrived. Assembly was no problem thanks to careful preparation. I only drew a different connector than the one I ended up using. I also added a 1N5817 diode, which is not included on the circuit board.
I also made a front and drilling template for the UB-EQ-Front so that the whole thing looks like something.
I printed the front on a transparent film…
… and cut it out.
After I tried to install the circuit board for the first time, there were problems. I had drilled the holes for the potentiometers with 7 mm. This was ultimately too small as the potentiometers were not 100% aligned. I then simply drilled the holes out to 7.5 mm and everything fitted perfectly.
Then neatly wired and screwed shut.
You can see the preliminary result in the picture, although I don’t like the buttons so much and have already ordered others.
The schematic can be downloaded.
You can also download the BOM and also the Gerber file.
As a condition for the use of the files provided by me here, circuit diagram, parts list and Gerber files is that they are used exclusively for private purposes. For commercial purposes, my express consent is always required.
Here I present my self-designed 10 band graphic equaliser. The conditions I have imposed on myself are 10 bands and an operating voltage of 9 volts. I did some research on the Internet and came across the BA3812L chip. With one chip you can create a 5 band equaliser and with 2 chips a 10…