Electronics-Salon Stereo Phono RIAA Preamplifier Module Board, Preamp, MD-A310.
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This board comes with all of the necessary components. It really works.
"Qianson 3W DC Boost Converter 3.0" was the circuit board I used from Amazon. 3V- The amp is powered by a 10V step up to 12V" and works fine. It's about the size of a postage stamp and comes from China. I ordered two of them, and both of them arrived with the inductor top broken, but they still worked. To power the converter, all you need is a single power supply in the specified range. It worked on 12 volts, but I'm not sure how long it'll last. Make sure the 12 volt adapter isn't putting out a higher voltage with a light load, as some do. With the power converter, I'd use a 5 volt adapter. A USB 5 volt charger should suffice; however, keep in mind the polarity /-. the convertor is being fed
Selected User Reviews For Electronics-Salon Stereo Phono RIAA Preamplifier Module Board, Preamp, MD-A310.
After replacing the 220uf 25v stock cheap caps with Audio Note 330uf 25v and topping it off with Wima MKP10 0, I updated the op amp to OPA2132 and replaced the 220uf 25v stock cheap caps with Audio Note 330uf 25v. 1uf, 4 outputs Nichicon BiPolar 4 and 7uf electrolite It has a much more open and clean sound at 7uf. For those who enjoy tweeking the fun aspect of it, this is a good option. Signal wires are now soldered directly to the board, using DH Labs silver plated copper. br>I've replaced a few more parts, including the op amp, which has been replaced with a fantastic dual mono op amp module from Sparkos Labs that is class A biased and has fantastic specs, as evidenced by the sound! , super quiet, lots of clean bass, harmonics and transients, as well as treble, sound fantastic now, and the midrange shines as well.
4. From the output, a 7uf electrolytic cap was replaced with a 2uf electrolytic cap. RTX film on 2 Audyn Q4 poly caps 0. Added a 01uf bypass cap, and wow, what a difference in clarity and openness. All of this was placed in a beautiful wooden box with rubber feet. The final product pleasantly surprised me, and it was well worth the time and effort it took to build it. I'm now able to listen to vinyl in high resolution. The total cost was around 150 dollars, and it sounded like a million dollars, but who knows.
The following are some of the advantages of using this amplifier: 1) Noise is 80 decibels lower than a 5 mV, 1 kHz input tone. br>2) THD (Total Harmonic Distortion) is zero. 015 % with a 5 mV tone at 1 kHz frequency. br>3) The RIAA is accurate to within 1 dB. br>4) At 3, add an extra zero. The 18th United States of America is now operational. br>5) For MM/MI cartridges, there is a good selection of load values. br>br>So, why not give it a five-star rating? Despite the use of 1% resistors, the capacitors had a tolerance of 5%. The accuracy of the RIAA could have been increased to 0. If 1% capacitors had been used instead, the dB would have been decreased by 25 dB. I had to make some changes for my application, but overall, this is a fantastic board, especially for the price.
One of the screw terminals had a problem, so I had to lift it up and solder wire underneath it. One of the switches had a bad solder joint, but there were no other issues. I put in about $35, and it was a small investment. 15 volts boost, box, switch, and led br>I'd buy this product again. Just double-check the solder joints; they all appeared to be in good shape, but one of the DB switches was broken. So re- It had been soldered. br>A lot of work and time spent waiting for parts, some of which were shipped from China.
The soldering on the unit was extremely poor when it arrived. On the board, every solder joint is dull and cold. Components are protruding at strange angles, which isn't very appealing. I'm going to have to rework the entire board in order to make something usable out of it. Basic electronic assembly is not successful.
This is a fantastic little op amp! In my case, the switchable impedance was extremely useful. br>Dealing with the power supply requirement is a challenge.
The circuit is well-made and follows the textbook. Full documentation is lacking, and not all values are represented on the schematic, but that's okay. Retrofitting into a Seeburg 222 jukebox is the best option for this application.
This unit performed exactly as expected; it was simple to set up and functioned well for my needs at the lower gain setting. I like that it uses a bipolar power supply rather than a single polarity power supply, which could cause dc offset issues; I'm not sure if it came with paperwork or if I had to download it from their website - Anyway, it was not a problem, and I was able to obtain it.
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