diyAudio - Blog Entries
Go Back   Home > Forums > Blogs

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Old

Active inductor substitutes

Posted 3rd May 2010 at 01:45 PM by DougL
Updated 14th September 2010 at 06:34 PM by DougL

Here is a circuit I like.
Not excessive voltage drop, no absolute expectations on voltage or current.

http://aquinaudio.webspace.virginmed...act_choke.html

A link to the discussion in the Tube Forum

http://www.diyaudio.com/forums/tubes...ml#post2173626
diyAudio Member
Views 796 Comments 0 DougL is offline
Old

power supply for 150w 8 ohms

Posted 3rd May 2010 at 01:01 PM by klewis
Updated 19th January 2011 at 12:53 AM by klewis

Hi,
a dual secondary 40+40Vac transformer will give ~58 to 59Vdc.
With good smoothing and a well built amp you can easily achieve 150W into 8r0.

If you want to have the ability to drive a 4ohm load then you will need to double the smoothing capacitance and double the VA rating of the transformer.

For 150W into 8r0, a 300VA with +-20mF will do.

My 230:40+40Vac gives +-58.5Vdc when fed with 240Vac and the amp bias is 220mA. It gives 170W into 8r0 from a 3pair output stage.

The power supply application note is available at http://www.national.com/an/AN/AN-1849.pdf

build the right half of the PSU in the app-note (Fig.1) and instead of all the soft-start/relay fun, put a thermistor, CL60, in series with the primary leads of the transformer.

transformer http://in.farnell.com/united-chemi-con/esmh800vnn103ma50t/cap-alum-elect-10000uf-80v-snap/dp/1363662

Andrew T notes on sizing...
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 580 Comments 0 klewis is offline
Old

Guitar tone pot and caps

Posted 1st May 2010 at 01:52 PM by Wayne737

I have a quetion about guitar tone potentiometers and capacitors. A build I'm working on has a preamp. Must the tone control be before the preamp? And all the tone control is at the first part of the potentiometer. I want it to adjust the tone across the entire potentiometer. Would that have to do the the potentiometer, capacitor, or how it is wired?
diyAudio Member
Posted in Uncategorized
Views 1041 Comments 1 Wayne737 is offline
Old

Shunt Regulator Wiki

Posted 26th April 2010 at 12:50 AM by DougL
Updated 28th April 2010 at 06:43 PM by DougL

Here is my brothers response to the first version of the Shunt Regulator wiki. I actually wrote it for him so he could get a clue of what I was babbling about.

Дуг,

Это бумажное средство приблизительно столько же, сколько эта электронная почта будет означать для Вас. Я думаю, что это хорошо написано. Вы будете нуждаться в этой связи, чтобы выяснить то, что пятку я только что написал Вам, поскольку это находится на русском языке.

http: // translation2.paralink.com/

Кит

Here is a translation:
Arcs, This paper means approximately so many, this how much electronic mail will indicate for you. I think that this is well written. You will require in this connection in order to explain that the fact that I recently wrote heel to you, since this is found on the Russian language.

For thoes of you that are curious, the article is here:
http://www.diyaudio.com/wiki/Shunt_Regulation
diyAudio Member
Posted in My Projects
Views 2515 Comments 0 DougL is offline
Old

Hello

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

Hello.

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.
diyAudio Member
Posted in Uncategorized
Views 514 Comments 0 taro2ss is offline
Old

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 ?
diyAudio Member
Posted in Uncategorized
Views 1002 Comments 1 clemmtec is offline
Old

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
Woofer/Woofers.

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.
http://www.diyaudio.com/forums/multi...ml#post1653499

I will start a thread after...
diyAudio Member
Posted in My Projects
Views 1672 Comments 8 DougL is offline
Old

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....
kevinkr's Avatar
diyAudio Moderator
Posted in Uncategorized
Views 1459 Comments 1 kevinkr is offline
Old

After being freed of having a cast

Posted 15th April 2010 at 07:19 PM by Bas Horneman (Bas Horneman's diyAudio.com 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:
Attached Thumbnails
Click image for larger version

Name:	spider2.jpg
Views:	1297
Size:	82.6 KB
ID:	145   Click image for larger version

Name:	subchassis.jpg
Views:	1299
Size:	183.6 KB
ID:	146   Click image for larger version

Name:	subchassis2.jpg
Views:	622
Size:	80.4 KB
ID:	147  
Bas Horneman's Avatar
diyAudio Moderator Emeritus
Posted in Building
Views 933 Comments 0 Bas Horneman is offline
Old

L C calculator

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

http://malzev.tripod.com/book/butter.htm

Inductance Calculatorhttp://www.consultrsr.com/resources/eis/induct5.htm

LRC calculator http://www.calctool.org/CALC/eng/ele...cs/RLC_circuit
klewis's Avatar
diyAudio Member
Posted in Uncategorized
Views 536 Comments 0 klewis is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 08:07 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2