morphingstar
- Mar 1, 2012
- 58
- Joined
- Mar 1, 2012
- Messages
- 58
this is about music amplifiers for small stage. The have several input channels, for keyboard, microphone etc. The signals are mixed together and fed to the output jacks.
The situation I need explanation for is where there are 2 jacks, 1 left, one right (stereo).
My observation shows the jack marked Left is actually a stereo jack (1/4 inch, 6.3mm), the one marked Right is only picking up a mono signal, Right channel.
When I plug in 2 mono jacks, 1 for each channel, the signal is processed as stereo and turns up at the output just alike.
If I plug in 1 Stereo jack into the socket marked Left the 2 signals are processed as stereo, the socket marked Right is then not used.
In a similar way the stereo output with 2 sockets handles the signal.
What happens within these sockets?
Stereo-in on LEFT disconnects RIGHT.
Stereo-out on LEFT disconnects RIGHT.
Mono-in LEFT must make sure the RIGHT contact ring within the same socket is not shortened to ground by the mono plug.
I guess the circuit was developed decades ago. I have just never come across it. I would like to know how this signal separation for 2 sockets (mono) and signal combination for 1 socket (stereo) works.
Do not forget, I stated the LEFT will accept mono and stereo jacks. It operates as mono if the RIGHT is plugged in, and as stereo when the RIGHT is not plugged in, in the later case the jack must be stereo. The tip of the jack always carries the LEFT channel of a stereo signal. A mono connector has only tip and ground, it shortens the RIGHT socket contact to ground.
Please provide a link to the circuit diagram. As said I just can't find it. Thanks.
logged in 3 times to finally post this thread - just for my record - once was not enough.
The situation I need explanation for is where there are 2 jacks, 1 left, one right (stereo).
My observation shows the jack marked Left is actually a stereo jack (1/4 inch, 6.3mm), the one marked Right is only picking up a mono signal, Right channel.
When I plug in 2 mono jacks, 1 for each channel, the signal is processed as stereo and turns up at the output just alike.
If I plug in 1 Stereo jack into the socket marked Left the 2 signals are processed as stereo, the socket marked Right is then not used.
In a similar way the stereo output with 2 sockets handles the signal.
What happens within these sockets?
Stereo-in on LEFT disconnects RIGHT.
Stereo-out on LEFT disconnects RIGHT.
Mono-in LEFT must make sure the RIGHT contact ring within the same socket is not shortened to ground by the mono plug.
I guess the circuit was developed decades ago. I have just never come across it. I would like to know how this signal separation for 2 sockets (mono) and signal combination for 1 socket (stereo) works.
Do not forget, I stated the LEFT will accept mono and stereo jacks. It operates as mono if the RIGHT is plugged in, and as stereo when the RIGHT is not plugged in, in the later case the jack must be stereo. The tip of the jack always carries the LEFT channel of a stereo signal. A mono connector has only tip and ground, it shortens the RIGHT socket contact to ground.
Please provide a link to the circuit diagram. As said I just can't find it. Thanks.
logged in 3 times to finally post this thread - just for my record - once was not enough.