BC550 BC560 Very low noise RIAA

[jam]

peranders,

Good enough!

Jam

[jam]

lineup,

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

Jam

[lineup]

Som links lownoise circuits to explore:

LowNoise multi parallelled differential BC550 bipolar input RIAA (from old Elektor originally)
BC550 BC560 Very low noise RIAA

LSK389 JFET input pair to LowNoise bipolar Op-amp
http://www.diyaudio.com/forums/showt...72#post1519372
Cicuit: http://www.diyaudio.com/forums/attac...amp=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]

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:
SLN Pre-Amp - Elektor Aug 1982

topology is based on follow:
The most linear stage for large voltage swings - Lender's Circuit

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

[Retrohead]

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]

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 ?