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Tube-I-zator V2.0 Output Stage - Out of production

Posted 7th April 2011 at 02:14 PM by dvb projekt
Updated 14th June 2013 at 10:47 AM by dvb projekt

The Tube-I-zator V2.0

Click the image to open in full size.

The evolution brings the following changes:

- Heater Switch without any relays
- Low ESR Heater PSU (e.g. Panasonic FM)
- Star Grounding
- Mounting holes for the HV-Salas Shunt Module
- Compacter design

The PCB has the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 193x157 mm
Surface finish: Immersion Gold
Copper weight: 70m
Soldermask: Both sides - green
Silkscreen: Legend on top

Out of production
Attached Files
File Type: pdf Tube-I-zator V2.0.pdf (19.4 KB, 1154 views)
File Type: zip Tube-I-zator SSHV-Shunt BOM (6.8 KB, 520 views)
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Reference TDA1541A DAC Power Modules

Posted 7th April 2011 at 02:01 PM by dvb projekt
Updated 28th July 2014 at 10:07 AM by dvb projekt (Stock status updated)

+/- Power Supply Module

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- up to 15 caps per rail (16mm to 18mm diameter)
- place for decoupling foil cap in each rail
- place for bleeder resistor
- 105m copper weight
- 2mm pcb
- Immersion Gold
- green soldermask on both side
- Board size 195mm x 120mm

In stock

Reference TDA1541A DAC PS Module

Click the image to open in full size.

All lines are designed for the Mundorf M-LYTIC AG+ 4-Pole caps.
If you want to use normal 2-Pole Snap-In caps, just short the pads.

Diode snubber caps could be integrated.

This module is an alternative to the +/- PS module for those,
who dont want to use many small caps.

The PCB will have the following data:

Material: FR4 - 2mm
Attached Files
File Type: pdf MLytic 4pin.pdf (13.4 KB, 288 views)
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Low effort Class D with ready made modules

Posted 5th April 2011 at 05:45 PM by alexcp (My DIY projects)
Updated 6th April 2011 at 02:29 PM by alexcp

To try out Class D without working too much, I picked two ready-made Class D amplifier modules: one is the $45 2*100 Watt Class-D Audio Amplifier Board from Sure Electronics with the optional $10 volume control board, the other is the $199 IRAUDAMP7S from International Rectifier.

The Sure Electronics module is based on Tripath's TK2050 chipset. Powered from a 150W 24V SMPS from Mean Well, it predictably puts out about 22W RMS to a 8 ohm load. (The declared 2*100W requires a 30V supply and a 4 ohm load.) The sound and the measurements are decidedly mediocre, although at the $45 price, the module still may be a good value. Also, the volume control board feels odd, as the knob only adjusts volume after a push; another push disconnects it again.

The IRF module requires dual rail supply, for which I chose an SMPS400A180 by hypex. With +/-40V rails, the amplifier delivers 100W RMS into a 8 ohm load. The measurements are good, and the sound is very interesting for...
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I need Help im trying to build a leslie speaker

Posted 4th April 2011 at 11:58 AM by ZWade

im trying to build a leslie from mix and match parts so far ive got the speakers amps and crossover kits. im having trouble with what im going to do with the motors. does any one have any information on how to build alternative leslie speakers. i'm a beginner to build these types of things so the simpler the better.
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Emitter resistors and diamond buffers and distortion

Posted 3rd April 2011 at 04:36 PM by rjm

Plenty of helpful advice in response to my question on emitter resistors, here.

And so finally I finish my prototype Sapphire amplifier, pictured below. The case is from Chinese audio outfit hlly, and very good. I bought it on eBay.

The rest of the components are described on my web page.
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Sapphire Headphone Amplifier

Posted 28th March 2011 at 03:15 PM by rjm

Since I was effectively blogging my progress with the project as a forum thread anyway, perhaps it would be better to make it a blog rather than a post. I'm open to the idea, but does anyone ever read these blogs?
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For Paul

Posted 27th March 2011 at 04:18 PM by klewis

LME 49811 schematic is the one used for the tests with only the 30pf compensation in the circuit.
Attached Files
File Type: pdf cordell v6 t4 schematic.pdf (16.8 KB, 277 views)
File Type: pdf lme49811 v2 servo schematic.pdf (37.1 KB, 257 views)
File Type: pdf Allison V6a schematic.pdf (24.7 KB, 263 views)
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On distortion by Bob C

Posted 25th March 2011 at 09:30 PM by klewis

I don't find it hard to believe that very low levels of certain kinds of distortion are detectable when at the same time virtually un-measurable differences between passive elements like cables and capacitors are widely believed to be audible.

THD-20 does not tell the whole story on amplifier behavior, but it has also been given a bad rap because single-number usage of THD-20 can obscure the real story. If you have THD-20 with a full-spectral analysis out to the 7th or 9th harmonic, it tells a lot more, but most THD analyzers start cutting off at 80 kHz. One should always take note of the waveshape of the THD-20 distortion residual as well. If it is rather sinusoidal, that is often not too bad. If it is spikey, that is potentially very bad.

CCIF 19+20KHz with full spectral analysis is much better because the IM products lie in-band.

At the same time, moderate levels of benign THD, like mostly 2nd and 3rd, may not bother anyone very much. This...
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Mountain Biking

Posted 25th March 2011 at 09:27 AM by chris661

Many years ago, (when I was 11, now 17), I got a bike for my birthday/Christmas combined present, I got a mountain bike. It was good for what it was: V-brakes, 21 gears, front suspension etc.
So, I enjoyed the bike for about a year, then decided the forks weren't great, and that upgrading them would make everything much better. Now, knowing nothing about bike geometry, I fitted some longer forks. Lovely, I could go over all sorts, land jumps and the front wheel always stayed attached to the ground. Being young and adventurous, I started doing drops - onto concrete. Needless to say the wheels that came attached to a 150 bike didn't hold up particularly well.
So, a little re-speccing later, the bike got some new wheels. These were heavy duty jump wheels that are designed for grown men to jump off stuff. A 13 year old would be fine. Due to the different hubs, I also had to fit a new rear cassette, and all the deraileurs and shifters that come with.
Seeing they were disc...
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New pair of power amps for the my subs

Posted 19th March 2011 at 09:48 AM by googlyone

In the process of upgrading the subs in the play room. The aim was to deliver in the 1kW region into 8 Ohms. Discretion (and common sense - if that ever entered the equation) led me to shoot for something closer to 650 watts (measued 73vrms, or 666 watts on a sine wave into an 8 ohm load, which brought a wry smile to my face).

I chose to use a bridged configuration, as this allowed the use of supply rails at sensible levels (+/-65V) odd. It also allowed me to use a heap of capacitors that I had laying around.

The transformers are ANTEK units, which much to my disgust cost less to buy and ship from the US than to buy locally made. (Sorry about being parochial, but shipping a two 20lb lumps of steel to Australia is expensive - what is with our local businesses???)

No surprise that I was worried about:
- Power supply - needs to be big
- Cooling - an awful lot of heat to get rid of
- Safety - don't want to be melting my speakers,...
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