Digital Tone Control Circuit Atmel ATTINY2313 LM1036

I had made a similar application recently, but it was a problem that the ds1844 IC could not be found in Turkey. While examining the avrs, when I saw that attiny2313 had 4 pwm channels, I immediately thought of this application. I tried on the board, the digital part of your question worked, finally I drew the pcb and connected the lm1036 and connected the stk4241i as an amplifier to the output, the result is working fine.

The general features of the circuit are selected with the menu button and the values are adjusted with the +- keys. Because the pwm resolution is 8bit, it adjusts between 0-255. I did not show the units digit on the LCD screen, I showed the level between 0-25, also there is a mute button on the circuit, it records the bass treble balance sound values to the eeprom. The values remain constant for the bar. It shows the values in the 2nd row.

In addition, I left a place for tk19 on the pcb in the future, if there is a ready-made code that works only with pin change interruption without using a timer to add control control in the future, I can add it to the circuit because timers are used to generate pwm, I also program attiny2313 on the circuit by adding an isp connector to the circuit as a programmer. I am using the simple parallel port programmer, I also took a test video for the circuit, but I would appreciate it if you could report any comments, suggestions or deficiencies regarding the circuit whose video is very bad.

Digital tone control circuit test

ATTINY2313 LM1036 input oscilloscope measurements

Digital Tone Control Circuit source cone and schematic pcb files: