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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.


Audio DAC with PCM1730
Posted on Sunday, May 4, 2008   •   Category: Audio DAC


There are 3 circuit boards, one for the receiver DIR1701, one for the DAC and one for a second filter for balanced outputs. I made separate boards for easier upgrade in the future.. The result is fantastic, I'm hearing details I couldn't hear before. Well done Burr Brown - TI. IC used: PCM1730, DIR1701, OPA627


S/PDIF DAC Digital to Analogue Converter
Posted on Sunday, May 4, 2008   •   Category: Audio DAC


This is quite possibly the simplest S/PDIF receiver and DAC available. It uses the absolute minimum of parts, and also minimizes the connections and control functionality usually provided. It is still a serious project, and is not recommended for beginners. As shown, the connection is COAX (but will almost certainly handle TTL just as well). If you want a dedicated TTL to COAX converter, there is an adapter shown at the end of this article. The spare gates in the 74HC04 package may be used for the adapter if desired.


LM3875 Gainclone
Posted on Saturday, May 3, 2008   •   Category: Amplifiers


Gainclone in the inverted mode with the pot at its input is great amplifier, so it will work fine without any preamp or input buffer. However, here is a suggestion for the further improvement of some parameters of the sound of the inverted gainclone. During experiments, I paid special attention not to loose the good sides of the original, unbuffered inverted gainclone.


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