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Old 20th January 2013, 08:20 PM   #1
FBMinis is offline FBMinis  Portugal
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Default Connecting MP3 Player to Amp not enough - help

I have a Sandisk Sansa+ Clip MP3 player that I usually connect to an Akai 930:

Clip+ headphone jack > RCAs > Akain 930 Aux in (or Tape in)

However, the mp3 player output is probably too low and I cant get a decent volume through the speakers connected to the Akai.

How can I solve this?

I'm ready to follow instructions and solder an amp kit, if that's the case.

Thank you,
Francisco
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Old 22nd January 2013, 04:50 AM   #2
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Buy/construct a preamplifier or a voltage amplifier.

If u r looking for a voltage gain of 2, you can use DRV134 and very simple to construct, but u have to check that doubling the output is good enough.

The easiest other one is to construct using NE5532 op-amps. Of course, you will need an appropriate power supply.

Gajanan Phadte
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Old 10th February 2013, 01:38 AM   #3
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Quote:
Originally Posted by gmphadte View Post
Buy/construct a preamplifier or a voltage amplifier.

The easiest other one is to construct using NE5532 op-amps. Of course, you will need an appropriate power supply.
IF there is room inside the amp you could put it there and use the existing power supply.............
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Old 27th February 2013, 01:22 PM   #4
FBMinis is offline FBMinis  Portugal
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Would one of these work?

Low-Noise Stereo Preamp Kit : TR Kits : Maplin Electronics
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Old 27th February 2013, 01:53 PM   #5
Mooly is offline Mooly  United Kingdom
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Have a look at this and in particular post #17
Volume pot for line level stereo
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Old 27th February 2013, 04:24 PM   #6
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An audio amplifier can achieve your desire.
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Old 28th February 2013, 05:15 AM   #7
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Connect the MP3 to the phono input and see if it is ok for you for the time being. Things may not sound good...

Gajanan Phadte
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Old 28th February 2013, 05:31 AM   #8
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by gmphadte View Post
Connect the MP3 to the phono input and see if it is ok for you for the time being. Things may not sound good...
Many cheap amps have opamp-based phono input, while nowadays only expensive ones can play as good as CD players. I mean, the phono amps are useless. Not difficult to modify the circuit to have suitable gain.
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Old 1st March 2013, 03:34 AM   #9
dangus is offline dangus  Canada
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Did you crank the volume up all the way on the Clip+?
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Old 10th May 2013, 07:44 PM   #10
FBMinis is offline FBMinis  Portugal
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I ended up successively building this one (there's a link for the schematic under the price number):

MP3 stereo audio amplifier kit - DIY audio amplifier kit - 2136

I had a TDA2822 here and gave it a shot. It's powered by a 9v battery and it sits between the Sansa Clip+ and my Denon 345 video input (nearly the same impedance as Tape or CD - phono has RIAA EQ, no good).

I found these other amps built around the TDA2822:

TDA2822
Stereo TDA2822 audio power amplifier circuit | wirings Diagram
TDA2822 Stereo Audio Amplifier Circuit
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