Hello,

This is just a simple multi-potentiometer (10k pots) board for connecting to an Arduino Nano, or any other microcontroller. 8 pots, 2 photoresistors and 2 connections for connecting Nano pwm pins to, including audio filtering RC components. PWM pins from Arduino go into U1 then to RC filters then out to R14, R15, which provide volume control.

Before I send off to the Wizard, might some fine folks here check over and offer comments/suggestions/advice? Would be sincerely appreciated.

Thank you,
TonyAme

 

But what is it for? Context?

 

But what is it for? Context?

Yes, thank you. It is just for general purpose of reading pots when using an Arduino microcontroller (or any microcontroller), anytime you need to read pots for any reason.
Also, to read photoresistors any time or for any reason. My reasons are for controlling DSP synth parameters using the Mozzi audio library: https://sensorium.github.io/Mozzi/learn/introductory-tutorial/

I often wire up protoboards with a bunch of pots for different uses, finally trying to make my own general purpose pot/photoresistor board. I thought I'd add the audio output circuits, since I often use protoboards for that too.

Would be really great to get some fresh eyes to look it over in case there are any boo-boos. I got a lot of help here for a couple of other boards I had made last autumn. If not for the help here I would have been screwed.

Thanks,
TonyAm

 

IC U1 has no part number.
The output says HIFI but the R12 with C10 filter (and maybe the other filters) cut all high frequencies above 5.9kHz.

 

You are asking for advice, so here it goes:
When drawing a schematic, instead of running lines squiggling all over the place for the ground and +5V rails, use instead the ground symbol and +5V arrow available in EVERY SINGLE schematic capture program.
It makes reading (and drawing) the schematic much, much simpler.

EDIT: you also have duplicate instances of both U1 and U2. And they appear to be connectors, not ICs. The letter “U” is commonly used for ICs and not for connectors, which may use “J” instead. Again, this will make the schematic more understandable.

2nd Edit: why the mix between JEDEC and IEC symbols? Use one or the other.

 

IC U1 has no part number.
The output says HIFI but the R12 with C10 filter (and maybe the other filters) cut all high frequencies above 5.9kHz.

Hi,

R12 and C10 (RC filter) goes to R14 (volume pot) and is a low pass filter. R9 & R13 connect together and go into C9 (4.7nf) then out to R15 (volume pot) <--- this is the HiFi output, (2 pwm pins from the Arduino combine through R9 & R13 for a higher fidelity output). This came directly from the Mozzi audio library page in case anyone is interested in this kind of stuff.

Thank you for doing the math on the frequency cut (5.9kHz), I can always change the components if it doesn't sound right, but I should double check this.

I have a habit of removing part numbers from some parts in easyEda, I probably shouldn't, however it's just a general purpose pin header connector.

Thank you for looking it over, I appreciate it.

TonyAme

 

You are asking for advice, so here it goes:
When drawing a schematic, instead of running lines squiggling all over the place for the ground and +5V rails, use instead the ground symbol and +5V arrow available in EVERY SINGLE schematic capture program.
It makes reading (and drawing) the schematic much, much simpler.

EDIT: you also have duplicate instances of both U1 and U2. And they appear to be connectors, not ICs. The letter “U” is commonly used for ICs and not for connectors, which may use “J” instead. Again, this will make the schematic more understandable.

2nd Edit: why the mix between JEDEC and IEC symbols? Use one or the other.

Hello,
Yes, You gave me the same advice last October, I really should be doing that! Thank you.
When I added those connectors using easyEda the symbols were automatically added to the schematic, I should try to change that too.

*Noted: the mix of JEDEC & IEC symbols. Will fix.

Sincere thanks for looking this over, and for the advice.
TonyAme

 

You are asking for advice, so here it goes:
When drawing a schematic, instead of running lines squiggling all over the place for the ground and +5V rails, use instead the ground symbol and +5V arrow available in EVERY SINGLE schematic capture program.
It makes reading (and drawing) the schematic much, much simpler.

EDIT: you also have duplicate instances of both U1 and U2. And they appear to be connectors, not ICs. The letter “U” is commonly used for ICs and not for connectors, which may use “J” instead. Again, this will make the schematic more understandable.

2nd Edit: why the mix between JEDEC and IEC symbols? Use one or the other.

Hello,
Fixed the ground and +V stuff. Makes the schem much more readable. Will fix the JEDEC & IEC stuff.
Thanks for the help.

TonyAm