Multiple Inputs on CMoy Amp?

gongzero · 14th September 2005, 02:40 PM

I've just built my first DIY project ever, a CMoy amp. I don't want to crosspost as the details of my build are available in the Introduction Forum (click here to view the post), but essentially I followed the Tangentsoft tutorial and have the following signal path:

3.5mm input --> Panasonic 10kOhm pot --> Amp --> 3.5mm output

I would like to add a set of RCA inputs as well. About the only thing that I'd be plugging into the 3.5mm jack is my iPod, which is used almost exclusively in noisy environments (public transport, the gym, etc.) so using a headphone amp in this case really amounts to little more than wasting a 9V battery. For in-home listening, however, I'd be connecting it to RCA line-outs.

My question is essentially how to go about this. Would just connecting the RCA jacks in parallel with the 3.5mm jack on the pot's input terminals work? Would it be better to install some kind of switching system between the two jacks?

I am quite a newbie at this stuff, so please forgive me if this is a bit of a stupid question.

TIA!

-A

buddha · 14th September 2005, 05:49 PM

You could just keep everything as is get an adaptor for home!

tobias_svensk · 14th September 2005, 05:55 PM

Yeah, adapter.

DC Dave · 14th September 2005, 05:57 PM

Or wire a DPDT (double pole double throw) toggle switch to select between inputs. Connect the output of the switch to the pot, and connect all grounds together

ofb · 14th September 2005, 11:12 PM

Quote:

Originally posted by gongzero
Would just connecting the RCA jacks in parallel with the 3.5mm jack on the pot's input terminals work?

yes.

Quote:

Would it be better to install some kind of switching system between the two jacks?

only if you want to switch between two sources that are both plugged in. doesn't sound like you do, so a switch is unnecessary.

Quote:

Originally posted by tobias_svensk
Yeah, adapter.

yeah. just get an adapter. it's fine for this.

gongzero · 14th September 2005, 11:23 PM

Aww, but adapters lack that je ne sais quoi... bling factor I suppose. :lol:

I've yet to fit the unit into an enclosure so I don't have a problem with doing a little more soldering. I may try the DPDT switch just for the fun of it, but in the meanwhile, I do have such an adapter lying around.

Thanks for the input!

-A

wes-ninja250 · 15th September 2005, 04:04 AM

Just get a 3.5mm -> RCA cable then, plug your source directly into your amp, problem solved.

Any computer store will sell them for about five bucks.

Wes

14th September 2005, 02:40 PM	#1
gongzero diyAudio Member Join Date: Aug 2005	Multiple Inputs on CMoy Amp? I've just built my first DIY project ever, a CMoy amp. I don't want to crosspost as the details of my build are available in the Introduction Forum (click here to view the post), but essentially I followed the Tangentsoft tutorial and have the following signal path: 3.5mm input --> Panasonic 10kOhm pot --> Amp --> 3.5mm output I would like to add a set of RCA inputs as well. About the only thing that I'd be plugging into the 3.5mm jack is my iPod, which is used almost exclusively in noisy environments (public transport, the gym, etc.) so using a headphone amp in this case really amounts to little more than wasting a 9V battery. For in-home listening, however, I'd be connecting it to RCA line-outs. My question is essentially how to go about this. Would just connecting the RCA jacks in parallel with the 3.5mm jack on the pot's input terminals work? Would it be better to install some kind of switching system between the two jacks? I am quite a newbie at this stuff, so please forgive me if this is a bit of a stupid question. TIA! -A

15th September 2005, 04:04 AM	#7
wes-ninja250 diyAudio Member Join Date: Feb 2005 Location: Kingston, ON	Just get a 3.5mm -> RCA cable then, plug your source directly into your amp, problem solved. Any computer store will sell them for about five bucks. Wes __________________ Do daemons dream of electric sleep()?

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14th September 2005, 05:49 PM	#2
buddha diyAudio Member Join Date: Apr 2005 Location: London	You could just keep everything as is get an adaptor for home!

14th September 2005, 11:23 PM	#6
gongzero diyAudio Member Join Date: Aug 2005	Aww, but adapters lack that je ne sais quoi... bling factor I suppose. :lol: I've yet to fit the unit into an enclosure so I don't have a problem with doing a little more soldering. I may try the DPDT switch just for the fun of it, but in the meanwhile, I do have such an adapter lying around. Thanks for the input! -A

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