merging headphones output to 1 speaker

[viewgsm]

Hello,

I have an output from a chip that drive headphones
PO: 13 mW (RL = 32 Ω)
PO: 25 mW (RL = 16 Ω)
I need to drive a single 8ohm speaker (.25w) instead of the headphones,
both channels share GND on the chip, can I just connect L to R and and feed that to the speaker (with GND to the other side of the speaker)

will I get double that output ?

Regards

[PeteMcK]

maybe, but it's more likely that you'll get smoke & a dead amp...

[Kindhornman]

viewgs,
I think what you want to try is one output on each side of your speaker. I can't say this for sure but if you tie the two outputs together I think that you will smoke the chip amp. I think that most headphone amps are made to drive 600 ohm loads, at least that is what I remember. Leave the ground wire out of the loop.

[gmphadte]

25 mW will not drive any speaker to listening level.

Gajanan Phadte

[sofaspud]

+1
You'd be much better off using a conventional two-resistor summing circuit feeding a LM386.

[Ron E]

Originally Posted by gmphadte

25 mW will not drive any speaker to listening level.

Depends on listening level and sensitivity 10* log(.025)=-16dB, so it will drive a Klipschorn to 87dB peaks, and a typical home speaker to ~70dB peaks

Running an output to each speaker terminal will give a L-R or R-L signal.

A summing circuit to a small amp is the right answer.