Documentation for building this preamp (schematics, boards, Arduino code, building pics) can be found on this link.
I proudly present my DIY HiFi preamplifier! It is based around Hi End audio chip PGA2311 manufactured by Burr-Brown. Chip I'm using is A-grade version with even better THD+N than standard U-grade (0.0002% THD+N at 1kHz vs. 0.0004% THD+N at 1kHz).
Other parts in the preamp I designed myself: triple power supply - positive and negative analog and digital power supply are completely separated (unlike in some cheap Chinese versions). Power supply circuit is copied from Lehmann Black Cube Linear design, which is much praised.
There are 3 inputs routed with quality Takamisawa signal relays. Control board utilizes AVR controller, encoder volume control with LED bargraph for volume level vizualization. Unit can be controller with IR remote controller.
It looks nice in the company with AKG 701 earphones and Lehmann BCL amplifier (and sounds even nicer!):
One look inside reveals internal design:
I proudly present my DIY HiFi preamplifier! It is based around Hi End audio chip PGA2311 manufactured by Burr-Brown. Chip I'm using is A-grade version with even better THD+N than standard U-grade (0.0002% THD+N at 1kHz vs. 0.0004% THD+N at 1kHz).
Other parts in the preamp I designed myself: triple power supply - positive and negative analog and digital power supply are completely separated (unlike in some cheap Chinese versions). Power supply circuit is copied from Lehmann Black Cube Linear design, which is much praised.
There are 3 inputs routed with quality Takamisawa signal relays. Control board utilizes AVR controller, encoder volume control with LED bargraph for volume level vizualization. Unit can be controller with IR remote controller.
It looks nice in the company with AKG 701 earphones and Lehmann BCL amplifier (and sounds even nicer!):
One look inside reveals internal design:
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