I want to build high quality preamplifier with built-in DAC from SPDIF or USB for my power amplifier Leachamp. I tried to design DAC from USB with this circuit on one-sided PCB and I was successful.
Schematics is from datasheet of PCM2902. Circuit includes DAC and ADC, SPDIF output and input and HID part with 3 buttons for MUTE, VOL+ and VOL-. I used only DAC part. Other parts are not used. For high quality playback is needed to use external low-drop voltage stabiliser for DAC part. I used LP2951CM which was available at local store. Output voltage is set to about 3.7V with two resistors. Circuit board is designed regarding to good ground placement and separating of analog and digital ground. These ground are connected in one point at USB connector.
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1 Comentar:
Hey Nice to know this dude. I too had lot of interest in building Electronic Circuits and put it to my use. I came across a time when i was burning out things due to lack of guidance. later i came across Cypress, thro which i got some Documents, kits..., then i could see my interest skyrocketing.
Try it at http://www.cypress.com/
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