schematic for simple mag. phono cartridge preamp with riaa equalization

[Unknown]

I am looking for a simple schematic diagram for a phono preamp with
riaa equalization that i can build.

Thanks, jro...@yahoo.com

[Kalman Rubinson]

On Fri, 30 Nov 2001 01:28:47 GMT, "frick...@nuts.ocm" <> wrote:

>I am looking for a simple schematic diagram for a phono preamp with
>riaa equalization that i can build.

You can find that in the app notes at National Semi, Linear
Technology, Burr-Brown and/or Analog Devices. See their websites.

Kal

[Arny Krueger]

<frick...@nuts.ocm> wrote in message
news:3uQGPBQmnkoWUF...@4ax.com...

> I am looking for a simple schematic diagram for a phono preamp with
> riaa equalization that i can build.

Here are some sources:

http://www.paia.com/riaa.htm

http://www.rane.com/pdf/ps1sch.pdf PAGE 9

http://www.geocities.com/TimesSquare/1965/phono.html

http://sound.westhost.com/project25.htm

http://www.infomaniak.ch/~bonavolt/hiraga.htm

http://web.mit.edu/cheever/www/nuvpre.htm

http://www.infomaniak.ch/~bonavolt/dyn_pas2.htm

http://www.fna.muohio.edu/dogstar/tubestuf/sapover.htm

http://www.national.com/ds/LM/LM833.pdf page 14

http://www.rolls.com/data/vp29man.pdf page 2 (no parts values)

http://members.home.net/roma60/twelve.html

http://www.teresaudio.com/haven/preamp/csb_riaa.gif

http://www.reprise.com/host/circuits/riaa_preamp.asp

http://space.tin.it/scienza/fladelle/Page10.htm

http://hhscott.com/cc/preamplifier.htm

http://home.swipnet.se/~w-50719/hifi/qsxm2/schema_qsxm2.html

http://www.rane.com/pdf/ps1sch.pdf PAGE 2

[Pete Gianakopoulos]

Also, Marshall Leach has a good one one his website,
http://users.ece.gatech.edu/~mleach/. It is a discrete design, that runs
from +,- 24V. I have built this one, including his line amp, and the sound
out of the unit is very good. He does have parts lists and board layouts
that you can download. The hardest parts to find are the 7924 negative
regulators. I took another approach; I used a dual 24 Volt supply with two
transformers, two bridges, and wired them in series, using the center point
as ground and it worked out ok.

Pete

Arny Krueger <ar...@hotpop.com> wrote in message
news:j4KN7.3159$Hj3.59...@newssvr15.news.prodigy.com...

[Michael Black]

On Wed, 5 Dec 2001, Pete Gianakopoulos wrote:

> Also, Marshall Leach has a good one one his website,
> http://users.ece.gatech.edu/~mleach/. It is a discrete design, that runs
> from +,- 24V. I have built this one, including his line amp, and the sound
> out of the unit is very good. He does have parts lists and board layouts
> that you can download. The hardest parts to find are the 7924 negative
> regulators. I took another approach; I used a dual 24 Volt supply with two
> transformers, two bridges, and wired them in series, using the center point
> as ground and it worked out ok.
>
> Pete
>

One could always use a 337 variable voltage regulator, a negative supply
version of the 317.

In one supply I built, a long time ago, I didn't have a negative
regulator. In effect, I built an inverter. A pass transistor in
series with the negative supply, with an op amp feeding it. A resistor
from the output of the pass transistor, going to the inverting
input of the opamp. A resistor of the same value went from the
positive supply, which was regulated with some sort of regulator (it
might have been a 723 at that point), to the inverting input of
the opamp.

It worked fine for me.

Michael