Date: Mon, 5 Nov 2001 13:46:15 -0000 From: "Andrew Hookins" <andrew.hookinsnopsamodata.co.uk> Subject: Re: 9000 Audio system +/- voltage?
Not necessarily, can bias op-amps to 6 volts and use capacitors at inputs & outputs to block the DC offset voltage but pass the AC audio signal. The op-amps then see +/- 6 volts. AndyH "Fuseholder" <bjnsnopsama.com> wrote in message news:eGfF7.4748$Z_1.790533nopsamc.telia.net... > I recently got a stereoamplifier (9000 AUDIO SYSTEM) from a good friend of > mine and it is made by Luxor and a cassette/radio made by Alpine. > The problem is that it seems to me that something is missing... the > amplifier is fed with the usual 12-volts but > in the amplifier there is a whole bunch of TL074 op:s and they need a > positive and negative voltage and as far as I can > see there is no converter built in. Is the Alpine stereo supposed to deliver > that? > Any on this subject would be greatly appreciated. > > Best regards > Bjorn > >