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Posted 25th April 2010 at 11:58 AM by taro2ss


I may be writing a article for audio products of JAPAN on diyAudio blogs from today.

Thank you.

My DIY portable headphone amplifier.
Click the image to open in full size.
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3 way speaker

Posted 21st April 2010 at 12:48 AM by clemmtec

I want to build a speaker that has very stong
bass,and clean not the noise kind. what woofers or sub woofer would you recommend ?
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Research for My first Horn Speaker.

Posted 19th April 2010 at 08:57 PM by DougL
Updated 28th April 2010 at 06:44 PM by DougL

This is my foray into the dark side.
The only horn speakers I have ever heard was a K horn being driven with a Phase Linear 700.
Could not stay in the room.
Now I am curious if it can be better.

I have a 3 DCX2496 and 6 channels of amplification, so I will start with an active system.

My goal is to get the drivers close to 100db or higher efficiency.
I want to be able to experiment with low power amps.
I am also frugal, so I want to use low cost waveguide components.

Compression tweeter
Direct radiation mid

JBL 2123 is my starting point Second hand only.

B&C 6MD38 99db $89
B&C 8PE21 98 db $100
B&C 10MD26 100 db $160
B&C 10HPL64 98 db $130

Here is an example speaker.

I will start a thread after...
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Projects, Projects, Projects..

Posted 16th April 2010 at 05:07 PM by kevinkr
Updated 16th April 2010 at 05:19 PM by kevinkr

Like most of us here I seem to have more projects than I can handle. Just added another one - I'm going to do a simple little 6BQ5/6V6/7C5 based SE amplifier for nostalgia. (My first tube amp as a teenager was a 6BQ5 SE)

I've just added to the stack by ordering a pair of 6V6/6BQ5 SE OPTs from Tony over at Twin Audio. The price with shipping was pretty hard to beat, and I figure that the effort they put into building their amplifiers probably is also reflected in the quality of the parts they use. This amplifier will be pretty simple, most likely using pentode mode with some cathode feedback, a single stage high mu triode driver, and some limited global feedback to get the output impedance down. Hopefully I can make enough power to drive the HCC with it. I could conceivably incorporate the baffle step correction into the input of this amplifier if it is dedicated to driving the HCCs. As a firm believer in the benefits of fixed bias the output stage will incorporate that....
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After being freed of having a cast

Posted 15th April 2010 at 07:19 PM by Bas Horneman (Bas Horneman's blog)
Updated 15th April 2010 at 09:44 PM by Bas Horneman

on my hand for the past 3 weeks. It (the cast) finally was removed today. So I was itching to go.

Here is the result:
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L C calculator

Posted 13th April 2010 at 01:08 PM by klewis
Updated 11th March 2011 at 02:44 PM by klewis

Inductance Calculator

LRC calculator
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having fun with pic controller

Posted 8th April 2010 at 07:23 PM by klewis
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Recommendations ~ Ultra high-end audio installer in the Portland, OR area

Posted 7th April 2010 at 06:35 PM by gsritchie
Updated 10th April 2010 at 12:18 AM by gsritchie (Change title)

I’ve finalized my research and am seeking a reputable Ultra high-end audio installer in the Portland, OR area for my vehicle. Someone who is extremely detailed oriented, taking extreme care to the interior, install and passionate in perfecting the ultimate balanced sound.

I fully comprehend the dynamics of the issues in producing a system over 1000w and will adjust the vehicle with a HO alternator, deep cycle battery and upgrade the “big 3”

Potential package:
·Fully lined with Dynamat
·Cardis or Pear interconnects and speaker wire
·Aluma Pro CAP
·McIntosh MX406 or Pioneer DEX-P99RS
·MacIntosh D/A converter
·Seas Lotus reference w/Scan Speak mid
· Sinfoni amps
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spice models

Posted 6th April 2010 at 03:17 PM by klewis

A bunch of .lib files can be found on this site:

IRF models:

Most vendors provide spice models for their products, it's just a matter of searching. With the time your library will grow.

The way to include a model in your simulation is as follows. Let's assume I downloaded a file...
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hv shunt notes

Posted 6th April 2010 at 03:00 PM by klewis
Updated 19th November 2010 at 02:34 PM by klewis

updated schematic

Lets see, for 20v use 1n4060 or 4061, for 24v 1n4062 and 36v 1n4066.

Saw the datasheets, nice Zeners. Thanks.

Here we go then. Not just any Zener, but 1N40XX Microsemi temperature compensated components, are to be preferred by shunt builders if they can get their hands on them. Noise concerns by possible wrong Zener choices addressed

v1.0 with LEDs LED's Green 2v

capacitors Panasonic TS-HA

They go around 62V after rectification in practice, like being 2X22V, still need a 10R resistor before cap, and they don't lose easily, very good regulation. If the 2X18V 80VA model goes 2X19V in reality, it would be best for about 53-54V and to avoid the resistor.

They're the R-Cores sold by audiophonics, The one pictured is from France,...
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