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Very Simple Phono Stage VSPS200 20th anniversary mono edition

Posted 18th February 2017 at 03:53 AM by rjm (RJM Audio Blog)
Updated 11th April 2017 at 01:02 AM by rjm (added board photo)

The classic VSPS slightly updated and fitted with a simple filtered Zener voltage regulator (Z-Reg).

Relaxed, spacious, easy to work on 80x100 double sided mono circuit boards.

The eagle .sch and .brd files, LTSpice .asc file, and Gerber zip package are all provided below.

Works fine with the NE5534A, or use whatever op amp you choose.


revision and edit history:

200a initial release
200b changed to 70x90 hole spacing
200c C3 package changed to PCM37.5, updated C3 part listing in BOM to Kemet
200d changed regulator back to the Z-reg add R9,10 to BOM
200e move C1 and C2 capacitors 90 degrees
200f further layout tweaks
200g even more layout tweaks
200h are we done with this yet?
200i - skipped -
200j - skipped -
200k removed brestrict layer and re-did the power planes using only rect/split
200l - skipped -...
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File Type: asc VSPS200f.asc (7.0 KB, 114 views)
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File Type: zip (65.9 KB, 46 views)
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Phonoclone 4.4s (and 4.5b)

Posted 15th February 2017 at 11:11 PM by rjm (RJM Audio Blog)
Updated 16th May 2017 at 12:57 AM by rjm (added 4.5b BOM)

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.

Rev. 4.4s boards are back-compatible with earlier Phonoclone revisions, with the anachronistic 2.5"x3.5" mounting holes, so I can drop it into my existing chassis. 4.5b moves to 70x90mm mounting holes to be compatible with the Sapphire, VSPS200, and CrystalFET boards.


Build Notes

4.0b had some low level residual ripple on the output as a result of capacitive coupling or ground loop error. The boards were respun as 4.4s (special test run, limited, unsexy green color) which work as designed. The next wide release is 4.5b.

The BOM and board connectivity checks, no issues.

The Bourns trimmer, R21, comes from the factory...
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Finally - a cheap FLAC player with digital out

Posted 8th February 2017 at 12:30 PM by abraxalito
Updated 24th May 2017 at 01:05 AM by abraxalito

I've been looking for something like this on Taobao for a few years now. A cheap player which includes a digital output so I can pair it up with one of my DACs. There have been cheap players, and there have been FLAC players but never cheap FLAC players - the cheapest prior to this one being a media player around 500rmb. This one goes into the pocket change category as its just 88rmb. What's more it includes Bluetooth. Order placed - will update after I've played with it.

Just received this - the heart of the beast is the Actions Semi ATS2825, some information about its features is available here :
Whereas a connector for headphones (top right) is shown on the photo, this doesn't support any analog out (my board has no connector fitted there). Its purely digital output - a header for I2S and...
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iNuke received!

Posted 7th February 2017 at 08:35 PM by HumbleDeer


Just yesterday evening, I received my iNuke NU3000DSP.

I've been playing around with it for a while and I absolutely love playing with the settings. I've tried out almost everything and even as a main driver it'd sound better than my current amp.

i've made speakon connectors already, but the xlr plugs aren't working. Can someone help me set up how to connect an unbalanced source like seperate RCA's to two XLR's? Like one XLR plug with the White RCA and anothe one with the Right. The pinout is confusing as some don't state Viewed from the from or Viewed from the back.

Cheers, though. I love this amp for subwoofer duty.

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A one-dimensional two-channels stereophonic standard

Posted 7th February 2017 at 01:47 PM by Grasso789
Updated 25th May 2017 at 09:46 PM by Grasso789

Recently it has been archieved to capture, store, propagate and play back audio with the full human hearing frequency range (16 to 16000 Hz) and contrast (7 Bel). Still, if a big sound source or several sound sources at once are the matter of content, such play-back sounds artificial, because all is emitted from one acoustic source. In order to hear, what is going on, we use both ears simultaniously, turn our head in different directions and will detect the electro-acoustic device.

While an indetectable electro-acoustic reproduction incorporated six microphones, storage and transmission channels and a house-sized sphere covered by loudspeakers on the inside and containing the listener, we can help imagination at least a little bit by introducing sonic differences between left and rite. We also want this stereo, after Greek stereos shape, to integrate thoroly and easily with already existing mono electro-acoustics. We may double transmission and storage channels, for example...
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Getting Distortion Down

Posted 1st February 2017 at 07:59 AM by SyncTronX
Updated 1st February 2017 at 06:25 PM by SyncTronX

Over in the Low-distrotion, Audio-range,
Oscillator thread (LINK) some posts
about getting lower distortion before taking
the measurement of a DUT (Device Under Test).

Our own RNMarsh posted some good results
running his Panasonic through a miniDSP
box configured as a Low Pass Filter.

He had good results. So I thought and told him
so, and suggested he might get better results doing a band pass filter.

So instead of doing my diode homework for
my Solid State Devices class, I thought I'd
better check, that is put up for shut up.

So, I did and here is what I discovered:

Before filtering:
Click the image to open in full size.
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