Arduino based LDR volume and source selection controller

[zdr]

SMD version is stil available plus there is fdv301n.

 

[t-minik]

Hi all

just a question , do we need to disconnect all input and output devices before calibrating or it can remains connected ?

best regards.

 

[zdr]

I think the latest firmware will mute the outputs but will not disconnect the active input. You can simply switch to unused input or disconnect active one.

 

[t-minik]

Ok thanks zdr.

it seems bias fluctuating a bit with time , do you recommend to let an "heat up" time (eg:15min) before calibrating ?

best regards.

 

[xmerlin]

SMD version is stil available plus there is fdv301n.

I've already printed the PCB , do you have any suggestion for a replacement with the same SC-72-3 package?

thanks
Christian

 

[SpyNet]

You can try these adapters

10pcs Double-Side SMD SOT23-3 to DIP SIP3 Adapter PCB Board DIY Converter HT | eBay

 

[xmerlin]

You can try these adapters

10pcs Double-Side SMD SOT23-3 to DIP SIP3 Adapter PCB Board DIY Converter HT | eBay

thanks!

 

[zdr]

Ok thanks zdr.



it seems bias fluctuating a bit with time , do you recommend to let an "heat up" time (eg:15min) before calibrating ?



best regards.

That would be recommended, yes.

 

[Project16]

I've already printed the PCB , do you have any suggestion for a replacement with the same SC-72-3 package?

thanks
Christian

You can also do like me.
Arduino based LDR volume and source selection controller

 

[jsantoro]

Or like me:

https://www.diyaudio.com/forums/ana...urce-selection-controller-91.html#post5237400

 

[Blamm]

Most people here build this as a separate preamp, with its own power supply and housing. I am considering building it and integrating it into a case with the TPA3118 boards I already have running.

These run on a 24V power supply like these. Instead of creating the supply mentioned by Vincent here, would it be a terrible impact on performance to fork the needed voltages off this supply using a couple of those cheap and simple adjustable step-down converters?

 

[zdr]

As long as the power is stable and clean, there should be no impact imho.

 

[Blamm]

Yeah I think that's the case. Might just give it a go, worst case I can build a new power supply for it all

 

[wineds]

I think you could fork the 12v analog ok but I would keep the digital and relay supplies separate. In the original power supply design both these supplies come from a separate transformer winding.

 

[wineds]

Note also that the reservoir capacitor for the +8V digital rail (C3 in original design) is important in terms of power down detection and saving of program variables to non volatile memory.

 

[Blamm]

Thanks, the buffer op 8V is something to keep in mind indeed! Could be added of course.
Separating the 12V lines properly, to avoid interference I presume, might be more tricky without double windings. A couple of diodes might not fix that.

Guess it's not really worth the effort in that case. Might as well just build the second supply for the preamp.

 

[yurgs]

Hello,
there are 2 different versions of the firmaware in the shared folder,
VxD OLED 4x2 and VxD OLED 4x2s
do you mind sharing what the difference is?

 

[zdr]

S stands for screen saver. The one without s doesn’t have screen saver routine.

 

[yurgs]

Subwoofer Output

Thanks Neb,
i updated my device with the new code,

but i was also wondering if it is possible to change the function of the output relays slightly:
(using the LDR to switch my Subwoofer output (Relay6) on and off.)


If "Output1" is selectet i would like to switch on R5, and if "Output2 is selectet i would like to switch on both, Relay5 and Relay6.


do you think this works?

 

[zdr]

Thanks Neb,
i updated my device with the new code,

but i was also wondering if it is possible to change the function of the output relays slightly:
(using the LDR to switch my Subwoofer output (Relay6) on and off.)


If "Output1" is selectet i would like to switch on R5, and if "Output2 is selectet i would like to switch on both, Relay5 and Relay6.


do you think this works?

There is no problem to make it work from the arduino point of view. You need to make sure it works from electrical perspective, as the load impedance will go down when you drive two inputs.