Posted 16th February 2017 at 12:11 AM byrjm (RJM Audio Blog)
Updated 21st February 2017 at 05:56 AM byrjm
The RJM Audio Phonoclone phono stage circuit has not changed since the first board was produced. The previous iterations just refined the layout and applied various approaches to the voltage regulation.
Most of you are probably only aware of the X-Reg sporting Phonoclone 3, but there were actually quite a few earlier versions with LM317 and LM7812 regulators.
The Phonoclone 4 applies a major revision to the board layout, making it more logical with grouped, standardized I/O connections. The X-Reg has been replaced with the S-Reg shunt regulator circuit. Overall the BOM has been considerably simplified and the parts cost reduced.
For the moment, the boards are back-compatible with earlier Phonoclone revisions, with the anachronistic 2.5"x3.5" mounting holes. Future versions will move to the 70x90mm mounting holes to be compatible with the Sapphire and CrystalFET boards.
A small number of evaluation boards (double sided,...
Runs off 100VA or higher power transformer, 2x15 VAC secondary, bridge rectifier, 2200 uF filtering or more on the power supply rails in addition to what is on the main boards.
The outputs go to a mute toggle switch and then a 2A fast fuse before connecting to the speaker terminals.
In the original, Q9 and Q10 are taken off board and glued to the face of Q13 and Q14 packages. This provides overtemp control, as the output transistors heat up the Vbe of Q9, 10 decreases - reducing the output bias current.
C2 was not present on the original. I include this compensation capacitor as an optional tuning option, though my own tests show it shouldn't...
Posted 18th January 2017 at 05:33 AM byrjm (RJM Audio Blog)
Updated 19th January 2017 at 05:32 AM byrjm
I'm sure there are dozens of people on diyaudio who could do up this layout, but hey, it was a super-quick modification of the cartridge loading board I was doing anyway ... so to continue the series of 50x80mm "useful elements" boards, here is a dual bridge rectifier board for a transformer with two secondaries.
It will work with just about all of my projects, or anyplace you want to have the diodes separate from the rest of the circuit.
If there is interest I may get a set made up, or make the Gerbers available.
Posted 23rd December 2016 at 06:02 AM byrjm (RJM Audio Blog)
Updated 28th December 2016 at 12:46 AM byrjm
Following on from this post and this post, we arrive in time for the holidays with Project Unity. Merry Christmas everyone.
Four circuits: Unity, Unity H, Unity B, Unity BH. line preamp, Headphone amp, line Buffer, Headphone Buffer respectively, all derived from a common base circuit called Unity Root. Unity Root is conceptual, it exists only as a reference so you can see more clearly how the four working variants relate to each other.
It's the "all for one, and one for all" approach to diyaudio, a single research and development line applied to a range of applications, feedback from any of the applications brought back to apply to the line in general.
This simplifies not just the circuit development, similar efficiency is also brought to the documentation, board layout design, and BOM... about which I'll have more to say in a bit.
Posted 20th December 2016 at 05:47 AM byrjm (RJM Audio Blog)
Updated 21st December 2016 at 01:52 AM byrjm
I've come this far so I might as well complete the trifecta.
This is the X-Reg circuit, with a new layout and component numbering to match the new S-Reg and Z-Reg boards. Each is a drop in replacement for the other.
Like its siblings, the X-Reg is a low current voltage regulator for line level audio. The output is about 9 V (adjustable up to 12 V) and the maximum load current is 50 mA without heatsinks, 100~150 mA with small heatsinks on Q1,2.
It is not a true regulator as there is no fixed reference and instead the output voltage is defined relative to the input voltage. The high open loop gain of the op amp is harnessed for very low noise and very high ripple rejection. It is necessarily a high feedback approach.
So, there you are: three mix-and-match power supply options for all your low voltage, low current audio needs.
Posted 19th December 2016 at 01:55 PM byrjm (RJM Audio Blog)
Updated 21st December 2016 at 01:49 AM byrjm
Companion regulator to the S-Reg. Same board dimensions and connection layout. For line level audio.
Same idea as before rectified 2x12 VAC input, +/- 11 V output. 50 mA max output current unless the transistors are heatsinked.
There is a small amount of over-current protection afforded by R3,4 but do not short the output for all but the shortest of transients.
Eagle/Gerber files attached, so you can go get this made yourself, optinally with whatever modifications you need.
I've use this regulator circuit in my Sapphire headphone amplifier. It's a simple and modest circuit but I feel it works really well in practice as long as the audio circuitry it powers has reasonable PSRR. No feedback means no out-of-band noise or instability, even as the output impedance remains low.