Path: news1.icaen!news.uiowa.edu!NewsNG.Chicago.Qual.Net!nyd.news.ans.net!newsfeeds.ans.net!news.idt.net!nntp.giganews.com!cyclone.swbell.net!typhoon01.swbell.net.POSTED!not-for-mail Message-ID: <366D7DB8.A108FA6B@swbell.net> From: Rubywand Reply-To: rubywand@swbell.net X-Mailer: Mozilla 4.06 [en] (Win95; I) MIME-Version: 1.0 Newsgroups: comp.sys.apple2 Subject: Re: SuperSonic References: <366d5143.0@news.pacifier.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 76 Date: Tue, 08 Dec 1998 13:27:52 -0600 NNTP-Posting-Host: 207.193.9.50 X-Complaints-To: abuse@swbell.net X-Trace: typhoon01.swbell.net 913145089 207.193.9.50 (Tue, 08 Dec 1998 11:24:49 PDT) NNTP-Posting-Date: Tue, 08 Dec 1998 11:24:49 PDT Organization: SBC Internet Services Xref: news1.icaen comp.sys.apple2:142768 Ronald Clark writes ... > > Is there a way to make sounds not from the sound chip to go in the card? If you are connecting your Stereo Board outputs to a stereo amplifier or to speakers with built-in amplifiers, a simple way to mix in 'Old Apple' sounds is to connect a capacitor from the signal ("+" or non-ground) Spkr lead to one of the Stereo Card outputs. This connection mixes in combined (mono) IIgs sound, too. This is why a pot is included in the circuit. It lets you adjust how much of the Old Apple and mono GS sound to mix in so that, when sound is coming through the Stereo Board, the Stereo Board sound will predominate. The pic below shows a 5uF 15V non-polarized electrolytic cap running from a pot across the Spkr leads to the center of the Right Output socket. (You can use a couple regular 10uF caps connected back to back.) ---------------------------------------------o) Left Output ---------------------------------------------o) Right Output | x in-line connector Spkr sig (+)----| | or clip Z | approx. Z <------------|(-)|------| 5000 Ohm pot Z approx. 5uF 15V np Z Spkr Gnd -------| None of the values shown is especially critical and it does not matter which channel output you connect to. The in-line connector or clip is to allow disconnecting the Old Apple Sound wire when you wish to remove the Stereo Board for cleaning, etc.. It can be just a place where the wires are twisted together and covered with tubing which fits snugly. A handy place to connect the pot leads is on the Speaker connector at the right front corner of the motherboard. You can tac on wires near the bottom of the pins to leave room for reconnecting the Speaker plug. Note: As you face the front, the Left pin is +. It does not matter which outside leads of the pot go to which pins unless you care about having a clockwise turn = more volume. Otherwise, just connect the end leads and set the pot for the output level you like. If your Stereo Board has outputs which can drive speakers and you want to connect plain (unamplified) speakers to the board, the above connection will not do the job. If you do not mind poking around on your Stereo Board, you can probably find a couple of mini pots which set output volume for each channel. (I do not know if the SuperSonic board has these. It's a fairly common feature on sound boards with power amp outputs.) The middle lead of one of the pots (either one) is a pretty good bet as the place to connect the lead coming from the in-line connector. |--------- Z ... ----------------> Z | Z x in-line |--------- Spkr sig (+)----| | connector mini-pot Z | or clip vol. adjust approx. Z <---------|(-)|------| on Stereo 5000 Ohm pot Z approx. 5uF 15V np Board Z Spkr Gnd -------| Rubywand