H5 C1 YM AUDIO FIX

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exxos
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H5 C1 YM AUDIO FIX

Post by exxos »

@PhilC Spotted this one, I had not yet checked any of the audio system out since the redesign.

Symptom is the YM audio ( I just tested the normal key click sound) fades out over several seconds. Problem is a biasing issue on the audio amp which thankfully is easy to fix.


Slap **1K of your favourite variety across the highlighted points below...

(** This was previously incorrectly listed as 100K)

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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: H5 C1 YM AUDIO FIX

Post by PhilC »

@exxos Verified working for me as well, thank you :)
If it ain't broke, test it to Destruction.
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Re: H5 C1 YM AUDIO FIX

Post by exxos »

The above mod has been changed from 100K to 1K.

In addition a 100nF (0.1uf) ceramic type capacitor needs adding across the same resistor. This will prevent hissy / distortion when playing music. Oddly the diagnostic cartridge sound test doesn't show the issue.

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https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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