Let's see the noise on the supply rails after the cap multiplier. Not a fan of switching supplies when a +/- analogue supply is so easy to build, especially for phono preamps. They are even available as wall warts.
Thank you. FYI, I have finished another PCB prototype of a discrete RIAA-equalized phono preamp using 16 transistors for a 2-channel system. I will eventually publish it here soon on this channel, after two more RIAA-equalized opamp phono preamps are posted to complete the series!
Why do some people still believe that a transistor grab is better than an OpAmp in which all transistors are automatically matched and thermally equalized?
Thanks. The next RIAA-equalized MM phono preamps following this project are two Opamp-based preamps and then another classic 16-transistor-based preamp to conclude the series.
@@albinklein7680 Not true. Every plain vanilla 5532 outperforms such a transistor grave. And if I first have to measure the right transistors out of 100, it's not any cheaper.
Correct. The project's enclosure is made of plastic, so the copper tape is connected to the preamp's ground by soldering a piece of hookup wire to it, which helps in reducing noise issues.
@@buildaudioamps Looking at the schematic, it looks like the bases of the input transistors will be sitting at around +0.6VDC, so therefore shouldn't C1 face the other way as well? Or do the bases sit at zero, the emitters at about -0.6V, and the output as well?
Sorry I don't sell circuit boards; you have to make it yourself. If you need the PCB layout, send an email request to support@buildaudioamps.com. Thanks!
F response seem really poor with a 10 db rise in the bass. Not to say it isn't enjoyable it really should roll off below 20hz to avoid rumble. Not a good EQ circuit.
Let's see the noise on the supply rails after the cap multiplier. Not a fan of switching supplies when a +/- analogue supply is so easy to build, especially for phono preamps. They are even available as wall warts.
Thanks.
Parabens , Execelente
Thank you. FYI, I have finished another PCB prototype of a discrete RIAA-equalized phono preamp using 16 transistors for a 2-channel system. I will eventually publish it here soon on this channel, after two more RIAA-equalized opamp phono preamps are posted to complete the series!
Slap this in an overpolished and oversized case, throw in a few nylon nuts, slap a £25k price tag on it-audiophile transcendence!
Thanks for the comment!
Why do some people still believe that a transistor grab is better than an OpAmp in which all transistors are automatically matched and thermally equalized?
The same reason some people thing that vinyl is better then CD when it come to sound quality. It isn't.
Thanks. The next RIAA-equalized MM phono preamps following this project are two Opamp-based preamps and then another classic 16-transistor-based preamp to conclude the series.
@@davidlong1786 Thanks.
Good OpAmps are ridiculously expensive. A discrete Preamp with the same Quality is way cheaper to build. And more fun, too.
@@albinklein7680 Not true. Every plain vanilla 5532 outperforms such a transistor grave. And if I first have to measure the right transistors out of 100, it's not any cheaper.
Nice job. In order to assist the broader community, would you consider selling the board in a gerbr file so we can obtain PCBs?
Thanks! The PCB layout in PDF is available free by request at support@buildaudioamps.com.
Good.
Awesome project. Well done.
Is the copper strip underneath the circuit board to reduce interference /noise?
Correct. The project's enclosure is made of plastic, so the copper tape is connected to the preamp's ground by soldering a piece of hookup wire to it, which helps in reducing noise issues.
C10 is the wrong way round in the schematic.
Good catch! Sorry for the error in the schematic, but the part placement guide is correct if you have requested the plans. Thanks.
@@buildaudioamps Looking at the schematic, it looks like the bases of the input transistors will be sitting at around +0.6VDC, so therefore shouldn't C1 face the other way as well? Or do the bases sit at zero, the emitters at about -0.6V, and the output as well?
@@ScottGrammer Those are Nichicon Mfr # UES1H100MPM Bi-Polar/Non-Polar Electrolytic Capacitors Type: Bi-Polarized for Audio Equipment. Thanks!
Do you offer circuit boards and plans so other DIYers can build this phono preamp?
Sorry I don't sell circuit boards; you have to make it yourself. If you need the PCB layout, send an email request to support@buildaudioamps.com. Thanks!
F response seem really poor with a 10 db rise in the bass. Not to say it isn't enjoyable it really should roll off below 20hz to avoid rumble. Not a good EQ circuit.
Thanks