I have an old computer which I want to add a stereo headphone socket to, a single speaker (mono) and pass on the line-out level stereo outputs for any additional external amps etc.
The computer has actually got two line-level outputs (stereo) and a separate mono output (on its display connector). I don't know if it would be most beneficial to use the line level stereo outputs for everything, or the mono output for the single speaker. I'd also want the speaker output to break whenever headphones were inserted into the headphone socket. I'm not sure if I should have the output level work for both headphones and speaker or just the headphones (I can also control the output level from the computer's software settings).
The single speaker placed within the computer's cabinet will mostly be emitting simple beep type alerts and sounds. I suppose around 1W should suffice. Below is a block diagram describing the above followed by a schematic from the computer's audio output section. What kind of audio amp/mixer/buffer DIY circuit, schematic or ready made circuit board would I be looking for to have the above functionality?

The computer has actually got two line-level outputs (stereo) and a separate mono output (on its display connector). I don't know if it would be most beneficial to use the line level stereo outputs for everything, or the mono output for the single speaker. I'd also want the speaker output to break whenever headphones were inserted into the headphone socket. I'm not sure if I should have the output level work for both headphones and speaker or just the headphones (I can also control the output level from the computer's software settings).
The single speaker placed within the computer's cabinet will mostly be emitting simple beep type alerts and sounds. I suppose around 1W should suffice. Below is a block diagram describing the above followed by a schematic from the computer's audio output section. What kind of audio amp/mixer/buffer DIY circuit, schematic or ready made circuit board would I be looking for to have the above functionality?

