AMP51Pure Reference Design
by Martin Clausen (mc AT rotgradpsi DOT de)
Here an example of a construction of an amplifier with an AMP51Pure controller.
Puristic design: AMP51Pure with CS3310 and TDA7293
Table of Contents:
Further Information:
Is it possible to build a qualitative superior amplifier with highly integrated parts today? I am satisfied with the results of the AMP51RTC, but chips like the CS3310 from Crystal or the PGA2310 from TI show an even better performance than the TDA7318 from ST. Of cause this also changes the price and the is no input selector nor a treble and bass control. But if such a control is accepted in a high end design is a different issue.
Therefore I decided to use reed relais for the input selector and a CS3310 for the volume control. As an amplifier the only choise is the TDA7293 from ST, because of its superior audio performance. The whole amplifier is of cause controlled by a microcontroller.
And a bonus for the pure sound amplification: The clipping output of the TDA7293 is connected to the microcontroller. The microcontroller reduces the volume if the amplifier reaches its maximum output swing to avoid any distortions, saving also the live of the tweeters.
Click on the pictures to enlarge and to use the image map!
Front side view of the amplifier:
Back side view:
- Size: 447*240*144 mm³
- Output power with 4 Ohm load: 2* 80W RMS at 1% TDH
- And all data of the AMP51Pure
Connect the ground side of the feedback network, SGND and the input resistor of the TDA7293 directly at the CS3310 to ground. Use an additional NE5532A as a buffer for the rec-output.
Read avoiding TDA7293 pitfalls for more details.
Disclaimer: No warranty at all!
Copyright by Martin Clausen, Germany.
Contact the author: mc AT rotgradpsi DOT de
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