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If I put my notes here, I might be able to find them again later!
Old

A power amplifier.

Posted 19th January 2017 at 11:37 PM by rjm (RJM Audio Blog)
Updated 20th January 2017 at 05:58 AM by rjm

Another request.

The Sapphire4 and Unity (H) boards were based on the 47 Labs Treasure 0347 amplifier circuit, and the original was not so far away that I couldn't "de-modify" the Unity (H) board back to what is essentially a 0347.

Here's what else you need to know:

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...
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File Type: zip unity47-10a.zip (97.3 KB, 4 views)
File Type: asc Unity 10a (H) 47 mod.asc (5.5 KB, 9 views)
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Old

Phono Stage Cartridge Loading Auxiliary PCB

Posted 18th January 2017 at 07:02 AM by rjm (RJM Audio Blog)
Updated 19th January 2017 at 05:33 AM by rjm

By request.

Simple 4 option loading for MC or MM cartridges. Stereo board, 80x50 mm. Part of the "useful elements" series.

Inputs are bidirectional (pass through), the signal only has to be connected to one set to function. What more loading choices? Use two boards!
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Old

Dual Bridge Rectifier PCB

Posted 18th January 2017 at 05:33 AM by rjm (RJM Audio Blog)
Updated 19th January 2017 at 05:32 AM by rjm

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.
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Old

Project Unity Board Layout

Posted 27th December 2016 at 01:33 AM by rjm (RJM Audio Blog)
Updated 27th December 2016 at 11:11 PM by rjm

Two boards, each board configurable for line and headphone variants. Powered by nominal +12 V -12 V split regulated supply, though 9-15 V rails can be used without modification.
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File Type: zip pcb-unityB-10b1-bom.zip (98.7 KB, 23 views)
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Old

Introducing Project Unity

Posted 23rd December 2016 at 06:02 AM by rjm (RJM Audio Blog)
Updated 28th December 2016 at 12:46 AM by rjm

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.
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File Type: zip Unity 10 LTSpice.zip (5.6 KB, 15 views)
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Old

The (Xross-type) X-Reg Voltage Regulator (Stabilizer)

Posted 20th December 2016 at 05:47 AM by rjm (RJM Audio Blog)
Updated 21st December 2016 at 01:52 AM by rjm

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.
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File Type: zip pcb-xreg-16b1-bom.zip (96.9 KB, 15 views)
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Old

The (Zener) Z-Reg Voltage Regulator

Posted 19th December 2016 at 01:55 PM by rjm (RJM Audio Blog)
Updated 21st December 2016 at 01:49 AM by rjm

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.
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File Type: zip pcb-zreg-11b1-bom.zip (73.0 KB, 20 views)
File Type: zip Z-reg-11b1-Eagle.zip (63.8 KB, 17 views)
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Old

The (Shunt-Source) S-Reg Voltage Regulator

Posted 19th December 2016 at 12:09 PM by rjm (RJM Audio Blog)
Updated 21st December 2016 at 05:19 AM by rjm

S-reg voltage shunt-source regulator for line-level audio circuits.

This is designed to accept rectified 12x2 VAC input, producing +/-12 V output split rails.

Features soft-start and over-current protection, standard configurations for load currents up to 50 mA. High performance: 80 dB ripple rejection up to 100 kHz.
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File Type: asc sreg10e.asc (5.0 KB, 43 views)
File Type: zip pcb-sreg-10f2-bom.zip (90.0 KB, 16 views)
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Old

RJM Audio in 2017 [modular simplicity]

Posted 19th December 2016 at 01:11 AM by rjm (RJM Audio Blog)
Updated 28th December 2016 at 12:50 AM by rjm

The time of year where I like to draw up some plans for the next 12 months.

This year’s output looked something as follows,

At the end of all this I find myself sitting on four different voltage regulator circuits, several variants of the transistor output diamond buffer, five phono stages variants, and a couple of nebulous ideas about developing a discrete voltage gain amplifier.

I'm considering how to package this all up in such a way as to best appeal to diyaudio builders of widely varying application needs and skill levels while keeping a simple...
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Old

CFA audio gainblock - a second take

Posted 16th December 2016 at 02:21 AM by rjm (RJM Audio Blog)
Updated 16th December 2016 at 02:28 AM by rjm

This is either an ingenious interfacing of the output buffer and current feedback amplifier by adding second arm to the central current mirrors ... or it's another really bad idea(tm).

It simulates nicely though.

[What's happening here is current output of collector Q9 is no longer being asked to bias and drive the buffer Q16. Instead Q2 and Q17 do that job. The change lowers distortion, improves bandwidth, and even raises the PSRR a little.]
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