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The PSU case

Posted 17th April 2011 at 11:45 AM by dvb projekt
Updated 30th November 2016 at 08:58 AM by dvb projekt

Finally the engraved top-, front- & backplate arrived.

Click the image to open in full size.

Surely you are asking yourself, why i made a 1mm deep square around the place for the transformer...

...now here is the answer

Click the image to open in full size.

Ive got a perfect aluminum transformer housing and now it sits perfect without an air gap.


Now its time to assemble the parts.


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KENWOOD L-09 amp MODS

Posted 16th April 2011 at 06:18 PM by tube dog

re: KENWOOD L-09 amp MODS :

Have interest in mods to improve these DC mono block amps. After 32 years of service, a RECAP job of electrolytics ( 2) is in order for my pair (electroylics caps dry-out and BURST/ FAIL - and will take-out 24 output transistors and probably your speakers also ) So while the IRON IS HOT ..... I noticed the following possible mods to improve these amps' performance :
MOD #1- Replace 6 foot # 16/2 ' zip cord ' AC power cord....with 2 foot of # 8/2 ( amp pulls 1200 watts @ full power each ) note; a # 10/4 stranded copper power cable can be wired in 2 pairs ( red+black / white+green ) which eliminates DRILLING chassis opening LARGER to accomadate # 8/2, but will NET #8/2 gauge AND provide added shielding with 4 conductor spiraling ! THIS IS A NO BRAINER AND SHOULD MAKE THIS AMP BREATH a bit easier
(note : factory issue AC cord has NO ground conductor-and I would suggest NOT adding a grounded conductor to new 15 amp plug either-...
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Quick identification capacitors

Posted 12th April 2011 at 11:53 PM by ferynov

quick drawing for identify original capacitors :

Click the image to open in full size.

to my other blog
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Old

SSHV-Shunt Module

Posted 7th April 2011 at 01:19 PM by dvb projekt
Updated 30th November 2016 at 09:31 AM by dvb projekt (Stock status updated)

My last thoughts to optimize the Tube-I-zator goes to the B+ High Voltage lines.
To get the maximum flexibility, i have made splitting points in the lines.
The splitting of the anode psu lines brings upgrades possibilities.

You could use e.g. a tube rectifier with C-R-C filter instead of the onboard andoe psu or
switch to a regulated shunt psu, witch in my mind brings the greater sound quality upgrade.

With the experiences from Salas low voltage shunt on my DAC project in mind,
i have made an upgrade module for the Tube-I-zator based on his HV shunt circuit design.

Here it is


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


The specifications are:

- 2mm
...
Attached Files
File Type: zip Tube-I-zator SSHV-Shunt BOM Final.zip (6.8 KB, 503 views)
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Tube-I-zator V2.0 Output Stage - Out of production

Posted 7th April 2011 at 01:14 PM by dvb projekt
Updated 30th November 2016 at 09:33 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, 1850 views)
File Type: zip Tube-I-zator SSHV-Shunt BOM Final.zip (6.8 KB, 1035 views)
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Rating: 2 votes, 5.00 average.

Reference TDA1541A DAC Power Modules

Posted 7th April 2011 at 01:01 PM by dvb projekt
Updated 12th January 2017 at 09:19 AM by dvb projekt (Stock status updated)

+/- Power Supply Module

Click the image to open in full size.


- 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

Sold out



Shunt regulator modules
circuit design by Salas



Click the image to open in full size.

- Shunt regulator module for TDA1541A (+5V, -5V, -15V)
- separate Shunt regulator module for additional parts (+5V)
- 70m copper weight
- 2mm pcb
- Immersion Gold
- green soldermask on both side
- Board size 147mm x 115mm (46mm x 115mm; single +5V)

TDA1541A shunt module 2pcs. left in stock
...
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Old

Low effort Class D with ready made modules

Posted 5th April 2011 at 04:45 PM by alexcp (My DIY projects)
Updated 6th April 2011 at 01:29 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 10:58 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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Old

Emitter resistors and diamond buffers and distortion

Posted 3rd April 2011 at 03:36 PM by rjm (RJM Audio Blog)

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 02:15 PM by rjm (RJM Audio Blog)

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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