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Old 13th November 2014, 01:50 PM   #1
zatra is offline zatra  Poland
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Default Yet another passive volume control

Hi there,
i wanted to build my own passive volume control, so i started to look into some projects .. and upon them design my circuit. Because i'm an amateur in area of electronics i wanted to show my schematic and kindly ask for an help/opinion. I still need to draw connections for the display and push encoder.

So .. can anyone look into this and give me a hint how to best connect a display and encoder to this and if there are some mistakes(hope not)? Design is based upon atmega328 programmed with arduino.

Click the image to open in full size.

i'm bit better in drawing pcb's .. this is a mockup based on this schematic (shows top layer only)

Click the image to open in full size.

thanks
Mike
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Old 13th November 2014, 06:57 PM   #2
AndrewT is online now AndrewT  Scotland
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why are there 16 relay coils but only two banks of 7 relays in the schematics?
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Old 13th November 2014, 07:11 PM   #3
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Default Missing things....

.... don't forget to add:
- a programming header for the atmel
- perhaps an JTAG header for the Atmel
- some Debug Pins with LEDs
- perhaps the UART Tx line for debugging purposes....
- Diodes above the coils (Flyback voltage !)
- some small caps (100nF) across the relais coils, to shunt away noise picked up by the relais

Also, don't forget to design your Power Supply so, that if ALL Relais are ON, it can deliver the required current....

Perhaps, you can add the signal to the ADC to detect zero cross.....
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