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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
MFOS mixer headphone amp problem
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lexvortex



Joined: May 14, 2008
Posts: 155
Location: Toronto

PostPosted: Thu Feb 18, 2010 11:53 am    Post subject: MFOS mixer headphone amp problem
Subject description: Is there a better IC for the headphone amp?
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Hi,

I built the MFOS mixer a while ago and really like it, but the headphone amp is really noisy and it picks up signals from my other modules in the cabinet, like the clicking from my ADSR when it is set for a fast attack and decay or the frequency modulation from my JH freq shifter, this happens even if the modules are not being used. I don't have a problem with the regular stereo outputs.

Is there a better IC or maybe something I can do to minimize the cross talk and reduce the noise?

Thanks,
Dave
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druish



Joined: Jun 23, 2009
Posts: 91
Location: New Paltz NY

PostPosted: Thu Feb 18, 2010 4:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Shielded cables and better power supply decoupling or use separate PS.
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L-1



Joined: Dec 11, 2010
Posts: 39
Location: Belarus
Audio files: 4

PostPosted: Thu Jul 14, 2011 12:11 am    Post subject: Reply with quote  Mark this post and the followings unread

I have finished this mixer now. I used shielded cables. But headphones amp is very noisy too. This problem have solution or better to build another amp?
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Gaetano_AU



Joined: Oct 08, 2011
Posts: 52
Location: Australia

PostPosted: Sat Mar 01, 2014 8:26 am    Post subject: MFOS mixer headphone amp problem (SOLVED) Reply with quote  Mark this post and the followings unread

I had the same problem. Just use *** 35v Tantulum Caps *** and NOT Electrolytics.

C75 & C76 - 10uF 35v Tantalum caps, AND

C55 & C61 - 1uF 35v Tantalum caps for the best results.

The amp can then cleanly run a small set of speakers like an ARP 2600!


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