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AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2

20%

Average votes for this product
4.8 / 5
  Based on 12 customers reviews.


Reduced price!
Reference : 4227
New product
Limited time offer:

34,90 €tax incl.

-20%

27,92 €tax incl.

23,27 € tax excl.

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Shipping date: 09-07-2025.

Orders placed before 12h (GMT+1) will generally be shipped the same day (working day).

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Facturation France
SAV France

2 Years warranty

Accessories for this product

Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.

 
More info

The AUDIOPHONICS 4227 V2.2 module is used to buffer and amplify a stereo signal independently and qualitatively.

A simple transformer 2x15V low power can feed it.
Semi-scalable design, this card incorporates 2 OP AMPs operational sockets mounted on sockets to be upgraded at will.

They are supported by a power supply consisting of 2 "Great supply" capacitors each of 2200uF / 20V and 4 NICHICON NRSZ 220uF / 35V supported by several MKP capacitors.

Characteristics :

  • Connection of Inputs / Outputs by terminal blocks (CN1 input - CN2 output).
  • Signal input by 3-point connector
  • Board supplied bare, assembled and ready to be powered (Power supply from a 2X15V transformer)
  • Adjustable LM317 / 337 controllers
  • 2 AD OP275 Operational Amplifiers on DIP8 Interchangeable Media

Specifications:

  • Default Gain: 18dB (modifiable)
  • Input impedance: 100-130kohm
  • Output impedance : 600 Ohm
  • Max output level : 8.5Vrms
  • Bandwidth : 6Hz-24kHz
  • THD : 0.006%
  • Power Supply: 2X15V Transformer
  • Dimensions: 130 x 53 x 45mm (L x W x H)
  • Gain adjustable by means of DIP switch present in the middle of the PCB (x1, x10, x30)
  • Weight: 240g

 
Data sheet
InputPCB Connector
OutputPCB Connector
Channel2 (Stereo)
 
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Average votes
4.8 / 5
12 reviews
Why write products reviews ?
You can share your feelings about products and help other people by sharing your experience

Note :
 5/5
Date :
mod gain
Good module buffer.
Hi, i bought old version (no switch) preamp many years ago. I don't remember the modify to reduce the gain. Can you help me? Thanks.
 (1)
 (0)
Message from Audiophonics service
Hi,
It's silk printed on the board.

You can change the buffer gain using the DIP switch.
This review has been posted for AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2
Note :
 3/5
Date :
Attention
après quelques mesures (un vieux Tektro AA501 et un géné Tektro SG 505) Source 150 et 50 Ohms c'est bien meilleur avec les 5532 .
Mais il y a plus gênant : l'impédance de sortiedépend du gain imposé au circuit 1X ça va 20X 30X ...bonjour les dégats , Ne pensez pas charger sur 10K avec un gain autre que 1X sous peine d'écroulement du niveau de sortie et d'augmentation de la distorsion , donc utilisable avec une charge d'au moins 100k.
 (1)
 (0)
This review has been posted for AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2
Note :
 5/5
Date :
Davvero una ottica scheda.
Questa semplice scheda, è una delle pochissime buffer rimaste nel mondo della autocostruzione.
Mi ha risolto il problema di dover interfacciare una DAC con un Finale ICEpower; la prima ha una uscita di 2Vpp @ 47Kohm e il secondo un ingresso a 3,3Vpp @ 8Kohm. La costruzione è buona con un buon piano di massa, Anche l'alimentatore è dimensionato correttamente. Ho completato il montaggio con il potenziometro ALPS e i due condensatori e devo dire che funziona molto bene. Ho potuto osservare che i due operazionali doppi OP275 hanno un suono molto caldo e davvero "affascinante"; sulla scheda sono montati su zoccoli ma non credo che li cambierò ....vanno benissimo così! Per ultimo, ma non per importanza il prezzo : davvero ottimo
Spedizione in tempi molto veloci e imballaggio fatto molto, ma molto bene. Complimenti AUDIOPHONICS
 (0)
 (0)
This review has been posted for AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2
Note :
 5/5
Date :
Simple and versatile with high quality parts
I use this buffer combined with two Mundorf mcaps, a 10K ALPS blue pot (I know that a 50K pot is recommended but I has this pot already), and a 50VA toroidal transformer to drive an Audiophonics HPA-S250NC power amplifier. It is placed between the amplifier and an old Parasound 1100/HD DAC. Great improvement in dynamics, bass extension and imaging, against a passive pot used before. Highly recommended.
 (0)
 (0)
This review has been posted for AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2
Note :
 5/5
Date :
Genial
Je me suis monté un dac preampli, branché a un module dac sabre.
Je souhaitais tester et je suis renversé! Niveau son Ca joue dans la même cour que mon dac rme a 1000e(Sans les nombreuses options de ce dernier indispensables en studio)
Je n ai pas changé les aop, n en ai nullement ressenti le besoin a vrai dire, cablé en xh avec les cable audiophonics a embout plaque or et a un potentiometre alps 50k c est vraiment impressionnant (surtout à la vue du budget...!)
Merci audiophonics de proposer cette qualité en diy!
 (0)
 (0)
This review has been posted for AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2
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AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2
AUDIOPHONICS Stereo Buffer Module OPA OP275 V2.2

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