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MR211's Blog

Posted 25th January 2011 at 06:23 AM by asterkao
Updated 3rd September 2013 at 01:22 AM by asterkao

http://kao211.blogspot.tw/
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Compact PCB For All JFET Circlotron

Posted 24th January 2011 at 11:59 PM by Michael Rothacher
Updated 2nd October 2011 at 11:59 AM by Michael Rothacher

This is the artwork for the PCB in the pictures. It fits into the ExpressPCB miniboard profile so it's a little cheaper to have made.

It will be necessary to check the orientation of the bias pots (I can't remember). I wouldn't want you to blow-up your $30 JFETs.
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All JFET Circlotron

Posted 22nd January 2011 at 10:29 PM by Michael Rothacher

I've been mostly out of the audio hobby for a while, but I've had a few inquiries about the SemiSouth version of the Amazing FET Circlotron as of late. So, I wanted to post the performance graphs here before I lose them.
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Getting started again is harder than I imagined!

Posted 8th January 2011 at 12:09 PM by wintermute (Wintermutes Rantings)
Updated 18th January 2011 at 10:45 AM by wintermute (audigy now working reliably!)

It seems I have been doomed to not do any of my DIY projects since my main computers hard drive crashed followed shortly after by my laptops (the laptop has had another crash after that, and the drive is now on the way out again!!)

After having to pull the cables out of my chipamp last week and plug the TV into it (because the MythTV box refused to play a DVD and I can't plug the DV18 DVD player direct to the chipamp because it has no volume control) I decided I had better get off my backside and finish my pre/active crossover. I had to do it again tonight as well (plug the tv into the chipamp), sigh...

This is all because my playmaster had something in the pre die again and is only working on one channel and I just haven't been bothered fixing it. I thought that being inconvenienced might make me more likely to finish the other projects but it has been broken for about 6 months

So on Monday I decided that I should re-install Holm-Impulse...
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DCPP aka Engineer's Amplifier

Posted 8th January 2011 at 01:09 AM by alexcp (My DIY projects)

I just built a Distortion Cancelling Push Pull (DCPP) amplifier designed by Peter Millett. It sounds very nice, was fairly easy to build, and is rather inexpensive. Thank you Peter for the great design!
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Playing Vinyl on a TD-124

Posted 6th January 2011 at 08:50 PM by kevinkr

I acquired a TD-124MKII back in late September and after some months feel like I have come to some understanding of its strengths and weaknesses.

I finally understand that the drive train will never be silent, and needs some periodic maintenance to perform quietly.

Belts are problematic on the MKII, and later versions of the MKI with the dual in chassis intermediate pulley. For some reason very early units seem quieter in this respect.

Motor rebuilding is pretty worthwhile, mine of course was not running so it was mandatory. My experience with motor bearings is limited, but based on replacing a number of bearing sets I would recommend the bearings available from The Analog Depot over others I've tried. They are very precisely made and run well from the get go.

I've added a Bren1 record weight which I feel clamps the record more effectively to the table's moving mass, and I thought improved some areas of performance significantly. Bass...
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PreAmp Circuit

Posted 4th January 2011 at 11:33 PM by Lesa

Hello guys,

I was wondering if any genius out there who knows about preamp circuit who can explain this one to me.

See I am just getting into audio systems design and I am try to understand this preamp circuit and how it works.

A few questions:

1)what does the two cap in series does and why are they connect to ground?

2) what does R3, R1 and R2 does?

3) What is the uses of the polarity Reverse?

I have been reading up on these component but i am a little slow on understanding.

I would appreciate the help.
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IRS2092, Iraudamp 7D Delta Sigma?

Posted 4th January 2011 at 03:23 PM by vcougar

Hi I'm new here and hope you can help me.

Currently I am workingwith thecircuitIraudamp7Dwith theblockIRS2092. Unfortunately I dont understand with which type of modulation this circuit operates. In the datasheet of Iraudamp 7D is written that it is powered bythedelta-sigma modulation. But I not see the dealy flip flop. And the clock is with 400 Khz very small for Delta Sigma.
Can You confirm that this is by delta sigma?

for your help I would be very grateful!

Sorry for my bad English im from germany.

Iraudamp 7D: http://www.irf.com/technical-info/re...iraudamp7d.pdf

IRS2092:http://www.irf.com/product-info/data...ta/irs2092.pdf
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FALL Listening Space

Posted 3rd January 2011 at 05:53 AM by planet10

How many posts, describing the sound of something, have the caveat, "...in my room"?

My listening space/room is a subset of the upper floor of my house. All the volume of this space is fairly open and interconnected acoustically.

Click the image to open in full size.

The space is nominally 24'x36' (houses in Canada are still built in imperial units) surrounded by deck on 3 sides. The peak of the roof is at 2/3 and rises 17' at the highest. It slopes down over 24' to ~6.5' over the main room. An 8' x 12' section is divided off for kitchen with the bedroom above.

Click the image to open in full size.

The rest of the space is 12'x24', raised 42" above the main floor and has a roof (mostly) that vaults from 8' to the same peak (just over 12'). The main space & this space are connected by 2 -- 3.5x7' openings and 5 -- 16"x2.5'...
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Old

D1080 MkII 08 actives - mod summary and listening

Posted 1st January 2011 at 11:41 AM by abraxalito
Updated 2nd March 2011 at 11:12 AM by abraxalito

Before describing the changes brought about by the mods I've described, here's a summary of what they've been:
  • Crossover tweaked to flatten the lower end bass hump and knit the handover to the tweeter more tightly
  • Power amp sensitivity reduced to allow the volume control operate closer to maximum with my Asus soundcard or a standard CD player output.
  • Rectifier snubbers and additional filtering to the regulators fitted to reduce RF ingress on the power supplies.
  • Power amp supply decoupling improved at both LF and HF.
  • Signal grounds are now separate from power grounds and a star point established on the amp PCB. A ground loop between the two PCBs has been eliminated. The input signal ground is no longer connected to the tone control PCB ground - instead given its own dedicated wire to the star. Decoupling to ground on the tone control PCB has been removed.

Listening impressions

OK, so on to the part that you've been...
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