Stereo To Mono

[tennu]

Hi, so ive heard if i connect L and R together without resistor it starts fighting eachother . People told me that its almost the same like shorting two amplifier outputs together, it will work but not long .
So my question is what kind of resistor values i should use ? Also im putting 10k pot between the source and amplifier input .
Source is a bluetooth module and im using class d tpa3116 100w mono amplifier board, gonna make a bluetooth speaker. I don't need a stereo sound for my speaker because you couldnt even tell the difference 10m away from the speaker . Im using two stereo bookshelf speakers .
Thank you guys ! Much love

 

[rayma]

Use a series resistor of around 2k in each channel, located close to the pot.

 

[MarcelvdG]

2.2 kohm would be a reasonable value: not too much voltage loss with the 10 kohm potmeter and high enough to drive with just about any op-amp.

Edit: crossed rayma's post, nice to see that we agree.

 

[tennu]

Thank you thank you thank you !!! you guys are the best !

 

[rayma]

2.2 kohm would be a reasonable value: not too much voltage loss with the 10 kohm potmeter and high enough to drive with just about any op-amp.
Edit: crossed rayma's post, nice to see that we agree.

Yes, 1k could be a bit difficult for some circuits, but most should handle 2k.
Any higher than 2k, and you start losing too much level with the 10k pot load.

 

[MAAC0]

For line level out try 1K upward.
For speaker level try 50 Ohm upward. Make sure speaker outs aren't bridged.

 

[Mark Tillotson]

For speaker level 50 ohm resistors will need to be hefty 10W or higher which doesn't sound practical (I'd assume some attenuation would be needed anyway from speaker level to line level). Anyway this isn't pertinent to this thread.