[tech] nintendo external amplification problems

[LukeWells]

[uk-vac] [tech] nintendo external amplification problems
Hi,

Anyone clued up on amplifiers?

I went to Maplin and bought 2 small smpalifier modules, one 3 watt
and one 5.7watt.

I tried to get both of these to work on a nintendo donkey kong and
bother were REALLY loud and distorted.

I connected a 1 meg pot in series with the unamplified input lead,
but this gave barely any adjustment at all. I could adjust between
really loud and super loud by adjusting the pot.

Next I looked on the net and realised that I could connect one side
of the pot to ground (other side to input and the wiper to the out to
the amp. This allowed me to have better control of the volume, but
the sound was still way over amplified and distorted even when turned
down. Also it is picking up huge ammounts of interferene. I only need
to put my hand near the volume pot for it to buzz away like mad.

Any suggestions? can I do anything to reduce input sensitivity? The
5.7watt thing is based on the TDA2003 whereas the 3 watt one is a
sealed module.

Many Thanks

Luke

 

[andrewhannay]

RE: [uk-vac] [tech] nintendo external amplification problems
You will need a lower value pot to start with (around 1k) and it must be a
log pot.
Make sure your board ground, amp ground and pot ground are definately the
same.
Use the arrangement yo described, one end of the pot connected to the
output, the other connected to ground and the wiper going to the amp.
That is a standard arrangement for volume control, and when the pot is
turned all the way down you should definately get little or no sound.
I would imagine with your current setup you either haven't grounded the pot
properly or the pot is broken.
Andrew

>

 

[axeman_uk]

RE: [uk-vac] [tech] nintendo external amplification problems
would it be better to connect the 1meg pot to the wire going to the speaker
because if it goes before, the unamplified siginal would be unaltered with
the amp raising the sound to 5.7watts.where as after the amplifier its
afects are not being counter acted.reducing the sound to the speakers.

just a guess or somthing to try.

neal

>From: "Luke Wells" <ukvac@jigsawtechnologysolutions.com>
>Reply-To: uk-vac@yahoogroups.com
>To: uk-vac@yahoogroups.com
>Subject: [uk-vac] [tech] nintendo external amplification problems
>Date: Tue, 07 Feb 2006 09:13:44 -0000
>
>Hi,
>
>Anyone clued up on amplifiers?
>
>I went to Maplin and bought 2 small smpalifier modules, one 3 watt
>and one 5.7watt.
>
>I tried to get both of these to work on a nintendo donkey kong and
>bother were REALLY loud and distorted.
>
>I connected a 1 meg pot in series with the unamplified input lead,
>but this gave barely any adjustment at all. I could adjust between
>really loud and super loud by adjusting the pot.
>
>Next I looked on the net and realised that I could connect one side
>of the pot to ground (other side to input and the wiper to the out to
>the amp. This allowed me to have better control of the volume, but
>the sound was still way over amplified and distorted even when turned
>down. Also it is picking up huge ammounts of interferene. I only need
>to put my hand near the volume pot for it to buzz away like mad.
>
>Any suggestions? can I do anything to reduce input sensitivity? The
>5.7watt thing is based on the TDA2003 whereas the 3 watt one is a
>sealed module.
>
>Many Thanks
>
>Luke
>
>
>

 

[andrewhannay]

RE: [uk-vac] [tech] nintendo external amplification problems
Can't do it that way as the amp is trying to drive an 8ohm speaker, you
can't just stick a 1meg pot inbetween.
Have you fixed it?
I'm not an expert on Nintendo boards but I assume they don't have an amp on
them.
Don't give up it should work, you've done all the right things.
Andrew

>