Login
Back to forumReply to this topicGo to last reply

Posted By

Spektro
on 2012-07-22
07:40:34
 External audio and volume control

Hello,

I have a question. Does the TED volume control register control the external audio volume too?

If I have understood correctly, the Plus/4 and C16 has no audio input on the video connector but the expansion port connector has. If I connect an audio source, a CD player for example, to the expansion port, the audio signal will be mixed with the TED voices and the result can be heard through the video connector (audio out pin)? If that is the case, does the volume control register control the mixed signal volume or just the TED voices?

Posted By

TLC
on 2012-07-24
04:00:56
 Re: External audio and volume control

There is actually also an ext audio input on the video connector (pin 5 of the socket, to be precise). The TED volume control register has no effect on the volume of the mixed external audio signal. Mixing of the ext. audio signal to the TED's sound signal is merely done by a capacitor + resistor network (the TED doesn't know about the external audio signal, that is).

Posted By

MMS
on 2012-07-24
09:55:18
 Re: External audio and volume control

eh, that would make easy Xeo background music! Just add a 8cm CD with a long music and a special video cable next to 5.25"DD floppy .with the help of an external CD Player you have the background music, better than SID grin

Posted By

MMS
on 2012-07-24
09:57:16
 Re: External audio and volume control

certainly Ted will take care rest of the noise haha!

Posted By

Spektro
on 2012-07-24
20:07:57
 Re: External audio and volume control

Thanks TLC! I managed to connect a CD-ROM drive (analog audio output) to the Plus/4 video connector's audio input and it really did work! When using a maximum volume setting, TED sounds were much louder than the external audio. Adjusting the volume affected only to the TED sounds, just as you said.

Posted By

MIK
on 2012-07-24
20:27:18
 Re: External audio and volume control

Cool. All you need now is a remix of Gold Runner for Xeo3 to get you started. happy

Posted By

Spektro
on 2012-07-25
09:03:53
 Re: External audio and volume control

Right happy

By the way, I build an internal "audio in" port for the external audio. It's similar to the CD AUDIO IN and AUX IN ports, which can be found from the PC sound cards. I.e. you can use standard CD-ROM drive audio cable to connect an external audio source.

Here is a before and after photo: https://picasaweb.google.com/104346888035058255078/CommodorePlus4#5769088487145154514
Not a pretty sight but it works happy

Posted By

MMS
on 2012-07-25
10:05:14
 Re: External audio and volume control

nice, the next standard mod for Plussy happy



Back to topReply to this topic


Copyright © Plus/4 World Team, 2001-2024. Support Plus/4 World on Patreon