RE: tech : asteroids sound question

You should be able to amplify one of the aud outs and have no probs. I have
done this plenty of times with good results. Try coupling the aud out and
the amplifier with a .1mfd mylar cap. The 1000 mfd is intended for the
output of the p/p tda2002 setup.
An old Williams sound board or MCR dual amp board makes a good outboard
amplifier unit if you don't want to build one.

------Original Message------
From: "Andy Welburn" <warlords@ntlworld.com>
To: <vectorlist@synthcom.com>
Sent: March 16, 2001 2:00:18 PM GMT
Subject: VECTOR: tech : asteroids sound question

hi all..

i am having a most troublesome time with an asteroids board..

here is the problem, my mate has an alca 'planet' machine (bootleg
asteroids) but is using a proper atari asteroids board. after fixing a video
problem, and a sound problem, the board works perfectly on my testrig. The
cabinet however has no audio/regulator board, so there is no audio amp..

so we have tried to put in an amplifier, but i have a problem, asteroids
outputs a push-pull audio arrangement, and the amplifier we have is just a
(normal?) type, so any way we try and hook it up, we just get a loud hum
behind the game sounds.

analogue electronics is not my strong point :)

i am hooking up GND and Audio1 from asteroids into the amplifier.

a friend suggested to put a 1000uf cap across the amplifier inputs in order
to 'cap couple' it? it didn't work, made the humming much more quiet, but
hasn't solved it :)

i'm getting lost, has anybody else succesfully hooked up audio from an
asteroids *without* the aid of an AR1 or AR2??

i suppose the only other solution is to build a push-pull amplifier for it,
but that's a last resort..

many thanks.

Andy Welburn
(P-man)

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Received on Sun Mar 18 13:27:10 2001