High End Amplifier

HiFi, LoFi, Tubes, Transistors, ICs, Commercial, DIY

Postby stephenmartin » Wed May 30, 2007 12:00 am


Is there anybody that can help me out...I started building a high end amplifier many years ago and the only information I have (After moving)is the part number on the pcb 940078-1....

The amp is nearly complete but I can't find the original article/s that I refered to whilst building it

Any Information would be gratefull

Kind Regards

Steve Martin
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Postby Elektor Editor » Wed May 30, 2007 12:00 am

photocopies available from our sales staff on email:

sales at elektor-electronics dot co dot uk


Elektor Editor
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Postby mfff » Fri Mar 06, 2009 12:00 am

I have a similar problem, but it's just that there is probably one picture missing from the pdf-article! It should be the last picture where an added rc-network is pictured (Figure 8). That is mentioned in the text but the picture is missing...

"After the ‘official’ completion of the
device in the Elektor Electronics lab,
further tinkering revealed that small
RC networks on the inputs suppress
induced RF noise on the cables, and
that a 100-Ω series resistor in each of
the output lines assures the stability of
the PGA2311. As shown in Figure 8,
these components should be soldered
directly to the Cinch sockets using the
shortest possible leads, or even fitted
in the connecting cable, in order to
maintain the highest possible degree
of screening."

Could someone please help out with the component values and placing? Those parts are not mentioned in the parts list; only in the article text. I'm planning to get back to my pre amp project and I'd like to make sure it works as well as it should. I already got it working but I have to improve the casing a little because there is a bit more background noise than I'd like to hear. I'll try to use another metal case for the components inside.
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Postby johnnett » Fri Mar 13, 2009 12:00 am

PCBs 940078-1 (amplifier circuit board - two required for stereo version) and 940078-2 (inverter circuit board) were used in the In-Car Audio Amplifier - a three part project published in the October, November and December 1994 issues of Elektor Electronics.
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