Arduino+PGA2311 Ultimate PreAmp with OLED and IO switching

[sergiob]

Yes you can use them as digital output’s and also as digital input ie high or low.

I see your point.

alright I went back to my project which me and a friend had built in that a custom PCB was made and I had burnt a uno boot loader so I was using those pins. (may be my Oooops )

it would be great, don't you think?

 

[aditya]

As for using nano I completely concur with Zdr.

Other than that
1) Arduino Micro ( 32u4)
2) If we used a decoder than 3 I/0 pin to select 7 or 8 inputs and two I/0 can be used for selection of two output options.
3) I2C i/o expander for selecting relays.

 

[zdr]

Yes, you can definitely use another MCU which has more ports and processing power, a completely new PCB layout and firmware. But that belongs to a new thread then.

 

[aditya]

Yes, you can definitely use another MCU which has more ports and processing power, a completely new PCB layout and firmware. But that belongs to a new thread then.

Zdr if you could support the software changes then I can work on hardware and share the Gerber's and PCB files with you and we could discuss it.

 

[sergiob]

Zdr if you could support the software changes then I can work on hardware and share the Gerber's and PCB files with you and we could discuss it.

if you want I can participate in the work. in these two days I have been studying how to solve the problem based to yours

aditya zdr​

valuable information​

and assuming I have no knowledge of Arduino, I found some info online on how to expand the I / O using a PCF8575 expander connected to a ULN2803 by adding resistors to overcome the problem of driving the relays because the voltage is insufficient and I also added LEDs for signaling the input and output of the various channels. everything must be checked by those who know more than me, see pcd, I can post the gerber file created with Eagle program

.

 

[sergiob]

Jumper that needs to be placed:
View attachment 855968

the jump between pins 1 and 3 of the voltage regulator U4 - TLV702475, why was it done since pins 1 and 3 are connected to each other on the wiring schematic diagram?

 

[zdr]

It's needed because a trace is missing on the pcb.

 

[sergiob]

It's needed because a trace is missing on the pcb.

ok thanks 👍

another question, how come you didn't use cmos, for example CD4051 or CD4052 instead of relays

 

[zdr]

ok thanks 👍

another question, how come you didn't use cmos, for example CD4051 or CD4052 instead of relays

For audio signal switching? Are you kidding?

 

[aditya]

For audio signal switching? Are you kidding?

as much as I agree with you on not using 4051 for audio switching Acram used 51 & 52 for one of its amps ( I do not think anything is better than a relay ) but still 😛 .
I am aware of the leakage things between channels and therefore it's not liked.

 

[aditya]

ok thanks 👍

another question, how come you didn't use cmos, for example CD4051 or CD4052 instead of relays

nooooooooooo - too much interchannel leakage. Relay gives the best isolation ( as per Me ).. I have seen it on industrial data logger where in we would have issue with certain channel picking up some part of input of other channel so

 

[Micha_0910]

Hello,
they use a 328pb Why couldn't I read out here ?, the 328pb is difficult to obtain, the connections PE1 and PE0 are also not used
the 328pb certainly needs another bootloader (minicore) , which one did they use ?
I want to test the project on a breadboard first, and already own normal nano 328p

 

[sergiob]

For audio signal switching? Are you kidding?

thanks for your advice.

Also from my point of view it is better to use relays, preferably with silver or gold contacts

 

[zdr]

I would probably make a different version of this design - I recently went back to using tape decks and realized I don't have a way to do tape monitoring. So, I'm going to ditch a second output and connect the remaining output directly to RCA. This would allow to have 5 inputs and 6th relay to switch between selected source and tape monitor.

 

[zdr]

Hello,
they use a 328pb Why couldn't I read out here ?, the 328pb is difficult to obtain, the connections PE1 and PE0 are also not used
the 328pb certainly needs another bootloader (minicore) , which one did they use ?
I want to test the project on a breadboard first, and already own normal nano 328p

Why would you need PB for this design? I am using normal Nano with P variant.

 

[sergiob]

Why would you need PB for this design? I am using normal Nano with P variant.

but sorry ... the three pin connector J18, of which pin 2 (COM) connected to pin 10 of the ULN2003 is not an expansion for a possible other relay? err?

A pleasure. can you send me the Sketche file of the development of this project?
I would like to do some tests to expand the IN and OUT
Thanks

 

[Cat777]

I would probably make a different version of this design - I recently went back to using tape decks and realized I don't have a way to do tape monitoring. So, I'm going to ditch a second output and connect the remaining output directly to RCA. This would allow to have 5 inputs and 6th relay to switch between selected source and tape monitor.

It will take a lot of time? I also use Akai GX77 and Revox PR99 tape recorders. With pleasure I will buy a ready-made KIT with a tape recorder monitor and 5 inputs

 

[Micha_0910]

Why would you need PB for this design? I am using normal Nano with P variant.

the link in your BOM is a nano PB,
I tried it with a nano P and it works
thank you, that was very kind of you

 

[Micha_0910]

but sorry ... the three pin connector J18, of which pin 2 (COM) connected to pin 10 of the ULN2003 is not an expansion for a possible other relay? err?

A pleasure. can you send me the Sketche file of the development of this project?
I would like to do some tests to expand the IN and OUT
Thanks

J18 is for power supply PCB

 

[Micha_0910]

Why would you need PB for this design? I am using normal Nano with P variant.

In your picture (#1) you can see PE0 and PE1, and only the atmega328pb has these pins
they are unused