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TSEC's - DM2 Oscillator Before Refurbishment.

Posted 10th May 2011 at 02:47 AM by The Space Egg Corp

TSEC's - DM2 Oscillator Before Refurbishment.
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TSEC's - Lyons Instruments 'Interlab SQ10' Oscillator.

Posted 9th May 2011 at 12:54 AM by The Space Egg Corp

Here's a photo of TSEC's recently refurbished Lyons Instruments 'Interlab SQ10' Oscillator.
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TSEC's Mechanical Analogue Reverb - The RADIATION Reverb.

Posted 9th May 2011 at 12:10 AM by The Space Egg Corp

Here's a few photos of TSEC's - RADIATION Reverb.
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TSEC's New Oscillator - The DM2.

Posted 8th May 2011 at 09:52 PM by The Space Egg Corp

The DM2 oscillator, under inspection by Matilda, at TSEC.
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Digital Input Modules Power & Signal Schematic

Posted 8th May 2011 at 04:48 PM by dvb projekt

On request the section of my digital input modules


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Another Gain Clone

Posted 8th May 2011 at 02:07 AM by alexcp (My DIY projects)
Updated 7th July 2011 at 12:28 AM by alexcp (Added photos)

Unsatisfied with the sound of my gainclone amplifier, I re-used the enclosure and the power supply for a gainclone along the lines suggested by Bob Cordell, whose implementation of an LM3886 based amp was praised by at least one member on the NJ audio society.

I skipped both the Klever Klipper and the toroidal air core output inductor, and kept only 10,000 uF per rail in the PSU. The schematic can be found in Chapter 27 of Cordell's Designing Audio Power Amplifiers. The PCB was designed to re-use the existing mounting holes of the ChipAmp's PCB.

The result? Better than with a plain vanilla chip amp, but still not good enough for music. Perhaps I should not have limited myself to re-use of the PSU et al. but should have taken all the details of my implementation seriously.
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Velleman K4040 mods

Posted 8th May 2011 at 12:32 AM by alexcp (My DIY projects)
Updated 4th May 2014 at 12:59 AM by alexcp

I posted some time ago a note about my Velleman K4040 amplifier. The sound of the amp as built from the kit was unremarkable and definitely not in line with the price. Lacking experience with tubes, I was looking for some time for well documented mods to the kit.

I found two 2006 posts here and here and implemented them rather directly. The only difference is that I used IXCP10M45S instead of a pair of J508 current sources in each channel and replaced the 1N5408 rectifiers with UF5408 instead of adding noise suppressing capacitors in parallel to them.

The mods did not leave much of the original Velleman design in place; the result, however, is a remarkable improvement in sound!

However, two problems remain: (1) I got hum that wasn't present before the mods; and (2) a two-year old running around doesn't get along with eight hot, attractively glowing tubes. The project is shelved until a better time.

For future reference: The toroidal...
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Jumping back on board the digital train - part IV

Posted 6th May 2011 at 03:52 AM by abraxalito

Where is all this going I hear you ask? What's his point? Well to tell the truth I don't hear anyone asking this - the comments sections are remarkably empty save for jkeny egging me on

So here's my point, and its a single word: convergence. Convergence is coming to digital architectures - indeed its already here, just the majority of people have yet to notice.

The diverse marketplace for embedded processors is rather similar to the market for home computers in the early to mid-1980s. It was hard to make the choice - Acorn, Sinclair, Apple, Commodore, Atari, Amstrad, Dragon? Then convergence arrived in the shape of the IBM PC and those brands (with the exception of Apple) were relegated to the history books.

It took quite a while after the 1983 arrival of the PC for this to occur. I had an Acorn Atom which I built from a kit in the long summer vacation after I graduated, and I didn't make the jump into PC-land until the early 1990s. It wasn't...
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Old

External PSU finished

Posted 2nd May 2011 at 07:02 PM by dvb projekt

After a long weekend , i have finished the external PSU!

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Here are some internal view pictures.

On the upper side the two +/- Power Supply Modules,
in the lower left corner the 10H choke on amorphous cores from AE-Europe,
in the middle the 1st cap (3,9F Mundorf supreme silver in oil) of the HV-PSU line,
in the lower right corner the Power Switch Module with onboard solid state relays.

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And some close-up pictures

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...
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Jumping back on board the digital train - part III

Posted 1st May 2011 at 02:11 PM by abraxalito

Apart from an architecture which is attractive to program in, I also have several other demands on the checklist for the digital toys I'm going to pin my colours to. Ease of entry into the game and low cost development tools are a must.

Arduino is a phenomenon I did a little research into. Its become jolly popular over the past six years or so since its inception and I wanted to understand some of the reasons for its acceptance. One of the reasons has to be its open source nature. Another is the well written materials to get you going - they've put quite a lot of thought into the practical issues, even inventing their own vocabulary for elements in the process - 'sketches' springs to mind. If there's a weakness in what they're doing its this - its tied to Atmel as they're the vendors of the chips used. There are no second sources of the parts to my knowledge. This vendor-specific approach doesn't sit at all well with the open-source side - Atmel's architecture is unique...
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