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Very Simple Phono Stage VSPS200 20th anniversary mono edition

Posted 18th February 2017 at 04:53 AM by rjm (RJM Audio Blog)
Updated Today at 01:52 PM by rjm

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
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File Type: zip VSPS200f-eagle.zip (80.2 KB, 0 views)
File Type: zip VSPS200f-gerber.zip (69.2 KB, 0 views)
File Type: asc VSPS200f.asc (7.0 KB, 2 views)
File Type: zip pcb-vsps200f-bom.zip (112.5 KB, 0 views)
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Old

Phonoclone 4

Posted 16th February 2017 at 12:11 AM by rjm (RJM Audio Blog)
Updated 21st February 2017 at 05:56 AM by rjm

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,...
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File Type: asc phonoclone.asc (9.6 KB, 18 views)
File Type: zip pcb-pc-40b4-bom.zip (136.2 KB, 1 views)
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Old

Finally - a cheap FLAC player with digital out

Posted 8th February 2017 at 01:30 PM by abraxalito
Updated 13th February 2017 at 04:48 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.

https://item.taobao.com/item.htm?spm...cket=18#detail

Just received this - the heart of the beast is the Actions Semi ATS2825, some information about its features is available here : http://www.actions-semi.com/en/productview.aspx?id=195.
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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Old

iNuke received!

Posted 7th February 2017 at 09:35 PM by HumbleDeer

Hey!

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.

-Anna
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Old

A one-dimensional two-channels stereophonic standard

Posted 7th February 2017 at 02:47 PM by Grasso789
Updated 22nd February 2017 at 03:58 PM by Grasso789 (Cuts, new findings and finally small fixes)

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 playback sounds artificial, because all is emitted from one small single 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 myriads of tiny microphones, storage and transmission channels and a huge sphere covered by loudspeakers, 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. Therefore we may at most double transmission and storage channels, for example by...
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Old

Getting Distortion Down

Posted 1st February 2017 at 08:59 AM by SyncTronX
Updated 1st February 2017 at 07:25 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.

http://www.diyaudio.com/forums/attac...r-baseline.jpg...
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Old

For Sale - Reference DAC PSU for Red Baron / Tube-I-zator

Posted 28th January 2017 at 11:16 AM by dvb projekt
Updated 8th February 2017 at 06:19 AM by dvb projekt

Reference DAC PSU
for Red Baron / Tube-I-zator

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.Click the image to open in full size.

Click the image to open in full size.

Custom made "Galaxy" housing with 10mm front panel from modushop.biz

Custom made Transformer with double C-cores, made for Vacuumschmelze Germany for Siemens military equipment

Tube-Rectifier circuit (6106/GZ34 or equivalent) with High-End Parts for B+ of the Tube-I-zator

The C-L-C-R-C Network with no electrolytic caps!

Yamamoto Teflon socket
...
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Old

A power amplifier.

Posted 19th January 2017 at 11:37 PM by rjm (RJM Audio Blog)
Updated 23rd January 2017 at 11:55 PM 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 show it shouldn't...
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File Type: asc Unity 10a (H) 47 mod.asc (5.5 KB, 89 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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