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NOS-DAC
Posted on Wednesday, May 7, 2008   •   Category: Audio DAC


This project is a set of two DAC's made for my friend. The first one is NOS-DAC designed by Peter Daniel based on TDA1543 and CS8412 SPDIF receiver. The other one is a little modified version of USB PCM2702 DAC from TI application note. The heart of this part is low-cost 16-bit Philips DAC. As a SPDIF decoder was chosen Cirrus Logic CS8412 IC with SN75179 as an input driver. Each IC have it's own AN800x regulator and there are separate wiring for alalog and digital section.


TDA1543 Nonoz III DAC
Posted on Wednesday, May 7, 2008   •   Category: Audio DAC


The Nonoz III sounds the most accurate of all. It has better dynamics, more detail and maybe is even a bit smoother than version I and II. For the past months, I have been busy with experiments to improve the Nonoz II DAC. This has resulted in the Nonoz III DAC. I have the feeling that some parts of the Nonoz III can be improved and tuned. Still, I think that the current version is worthy of a release. In the next months, I'll see what improvements can be made... ICs used: TDA1543 DAC, CD8412 S/P-DIF Receiver


BH1417 PLL Stereo FM Transmitter
Posted on Tuesday, May 6, 2008   •   Category: FM Transmitters


This is a high quality PLL Stereo FM Transmitter with build-in VHF amplifier for longer transmission range. It is based on BH1417 chip that offers high quality crystal clear stereo transmission. Eight available frequencies are controlled by grounding S1, S2 and S3 pins on header connector. Includes, high quality ROHM BH1417 transmitter chip, on-board amplifier increases transmission range, uses 7.6MHz crystal for rock-solid PLL FM transmission, crystal based Stereo Encoder and 3.5 standard audio input jack.


LM3886 GainClone Amplifier
Posted on Monday, May 5, 2008   •   Category: Amplifiers


This a LM3886 amplifier that features both balanced (XLR) and unbalanced (RCA) audio inputs. I've changed the internal circuits of this ChipAmp or so called "GainClone" to use premade circuit boards. The reason for this is that the bass/ low frequency response of the prior version was not as powerful as I would have liked. It is said that simply adding more capacitance to the power supply improves this, but worsens the high frequency characteristics. Boards use a noninverting amplification scheme, versus the inverting circuit I had used previously, I have heard some people mention that noninverting is better in some respects so wanted to try it. At the bottom of the page you will see the different schematics for the inverting and noninverting designs. In addition, Images will now load in a new window.


XLR Balanced to RCA Unbalanced Adapter
Posted on Sunday, May 4, 2008   •   Category: Audio DAC


This circuit will convert differential sources single ended unbalanced RCA signal. It is useful to connecting DAC with balanced outputs such as PCM1794, PCM1798, PCM1730 to an amplifier that only have RCA audio inputs. INA134 is used as a XLR differential digital receiver or buffer for RCA inputs.


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