BC550 BC560 Very low noise RIAA

[sinigersky]

Has anyone tried the RIAA preamp? I am also interested in building one.

 

[AndrewT]

Hi,
I don't know if anyone has built it, maybe not even the designer!

 

[lineup]

This low noise riaa
is easy to build - opamp style with common transistors
and will have very great performance - if my sims are somewhat correct.

I think a good PCB prototype silksheet
would be of interest and use for 'Analogue people'
.

Now 🙂
when the hype of the day is about Low Noise
this project is interesting.

It shows what we can do by using low cost transistors
---> in parallell
to achieve reduced input noise

2T - 3dB
4T - 6dB lower noise, as used in my symmetrical design here ~ half the noise
8T - 9dB
16T - 12 dB, same as 1/4 of noise of 1T

Lineup 🙂 good & low cost audio regards

 

[GlidingDutchman]

It looks like the Elektor SUPA, decades ago.

It is indeed - more-or-less.

Just a week ago I fiddled with this circuit (Elektor) but I got no sound from my modules... 😕

D

 

[peranders]

I'll guess you have to trouble shoot then. Have you checked the currents in the amp?

 

[GlidingDutchman]

I'll guess you have to trouble shoot then. Have you checked the currents in the amp?

Chucked it in the parts bin... I now use an EAR 834P from a friend!

I am just not that good at understanding electronic circuits...

D

 

[jam]

Anyone consder using two of these gain blocks with passive eq between them or a split with passive and active eq?

Jam

 

[peranders]

Check my sig below

 

[jam]

When will you have it finished?

Jam

 

[peranders]

If you click at the link you can read all about it.

 

[jam]

peranders,

Good enough!

Jam

 

[jam]

lineup,

Would there be any penelty to current sourcing your diffferential amps.

Jam

 

[lineup]

3 Circuits provided by Lineup

😎
Som links lownoise circuits to explore:

LowNoise multi parallelled differential BC550 bipolar input RIAA (from old Elektor originally)
http://www.diyaudio.com/forums/showthread.php?threadid=91497

LSK389 JFET input pair to LowNoise bipolar Op-amp
http://www.diyaudio.com/forums/showthread.php?postid=1519372#post1519372
Cicuit: http://www.diyaudio.com/forums/attachment.php?s=&postid=1519372&stamp=1211672608

syn08 circuit:
http://www.synaesthesia.ca/files/headamp.png


Let's hear what people think 😀
I just dont like to make gigantic and complicated circuits for the task here

 

[Retrohead]

please help me!!!!

hi!
My name is Paul Mesaglio. I'm from Argentina and some time ago I found the "super low noise RIAA phono preamp" magazine Elektror. I'm a big fan of DIY (indeed I create guitar effects called RETROHEADFX) and was about to make me one when I found this forum your modifications. I immediately began to do them but I have some doubts:
Finally the two 15K resistors (R17-R21) are removed or fall?
Is the final circuit of post # 16?
I hope you can answer me because I am very close to finishing the design (Corel do first and then step ALTIUM ... if you're interested I can send files)
thank you very much
ps: sorry for my english🙁🙁

 

[tiefbassuebertr]

another thread to the same topic is here:
http://www.diyaudio.com/forums/elektor/121825-sln-pre-amp-elektor-aug-1982-a.html

topology is based on follow:
http://www.diyaudio.com/forums/soli...age-large-voltage-swings-lenders-circuit.html

finished PCB boards you will find here:
Hormann Audio - Hormann-Audio-Produkte

For MM and high output MC a very good solution. For best results a shunt voltage regulation in dual monaural version is necessary.

 

[peranders]

This was an old thread and all my links are changed. As I mention I have designed a massive overkill RIAA amp

 

[Retrohead]

THANKS!!!!!!!!!!!!!!!

Thanks to all for the help. I will continue working on the circuit!😀

 

[Retrohead]

my version of SUPER LOW NOISE RIAA PREAMP

HI
This is my version of the preamplifier. I'm still working hard on it. I added a relay for switching the input to ground or sent to the circuit. I did it with the intention that when changing a vinyl avoid having to lower the volume on your power amp or preamp ... just flipped the mute switch and I can manipulate the vinyl without any noise. Also I added a subsonic filter that can be bypassed by relay. The power supply is also a version of the "salas shunt regulator" .....
again...sorry for my very bad english!!!!

 

[vulejov]

MC phono BC550/560C

LT Spice simulation is with 547/557 but works better with 550/560..
for DC servo use OP07..

 

[atupi]

@retrohead-how do you like the sound of this pre ?