Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Hiraga 20W class A
Hiraga 20W class A
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
Reply
 
Thread Tools Search this Thread
Old 10th June 2001, 06:52 PM   #61
tvi is offline tvi  Australia
diyAudio Member
 
tvi's Avatar
 
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
Sorry about that,
Don't know what I was think, here goes with a fixed version
<pre>
+-----+-----+---+-{2k2}-+----+-------------+- +25V
| | | | | | |
| | | | | |T| |
| | | | | |H| D33A 1
_|_ __|__R | | | | R
2n2___ /Z\ D | | | 3 |
| | 9 | | 2 k E--C 2
| | A 8 | K 3 2SA634 S
+-----+ K | 2 | C----B D
| 2 | +----+-----B | 1
| | | | | E 8
GND | | C | | 8
+---(------B 2SC815 | |
| | E | |
2 | | | |
4 | | 1 |
0 | | K |
R | | | |
| | | | |
+---B E C-(-+ | | |
| 2SA539 | | | | |
| | | 5 | |
-{4k7}-+---+ | | 0--+-{200R}---+----+--
| | | | 0 | | |
1 | 2SC815 / | R 1 | |
0 +---B E C / | 0 | |
k | | | R | |
| | | | | | |
GND 2 | | GND | |
4 | | 1 |
0 | | K |
R | | | |
| | E | |
+----(-----B 2SA539 | |
| | C | |
| | | | E 2
| | +----+-----B | S
GND 8 | | | C----B A
| k | 2 3 2SC1096 6
+-----+ 2 | k k E--C 2
| | | | 2 3 | 7
_|_ __|__R | | | | |
2n2___ /Z\ D | | | |T| 1
| | 9 | | | |H| D33A R
| | A | | | | |
+-----+-----+----+-{2k2}+----+-------------+ -25V</pre>

As for the D-33A, Toshiba may have lost its thermister range when it sold Marcon to United Chemicon, none of the Toshiba or United Chemicon websites have any thermistors listed.

Regards
James
  Reply With Quote
Old 3rd December 2007, 01:34 AM   #62
danieljw is offline danieljw  Australia
diyAudio Member
 
danieljw's Avatar
 
Join Date: Jan 2005
Location: South Australia
Send a message via MSN to danieljw
Default Hiraga

Nice thread guys,

just built Le monstre and i am fast becoming a Hiraga fan.

any one else built one recently, thinking about making another with newer toshibas....

-Dan
  Reply With Quote
Old 21st January 2008, 11:45 AM   #63
GUILHERME is offline GUILHERME
diyAudio Member
 
GUILHERME's Avatar
 
Join Date: Oct 2002
Location: PORTUGAL
Yes - I've built the 20W Class A as a pair of 40W (each) monoblocks using the Sanken 2SA2922/2SA1216 and BC550/60, and I'm getting very good results (still a work in progress).

J.Guilherme
  Reply With Quote
Old 21st January 2008, 10:36 PM   #64
danieljw is offline danieljw  Australia
diyAudio Member
 
danieljw's Avatar
 
Join Date: Jan 2005
Location: South Australia
Send a message via MSN to danieljw
Hi there Guilherme,

What circuit changes have you used, do you still use the thermistors ?

-Dan
  Reply With Quote
Old 22nd January 2008, 01:21 PM   #65
GUILHERME is offline GUILHERME
diyAudio Member
 
GUILHERME's Avatar
 
Join Date: Oct 2002
Location: PORTUGAL
No, I don't use thermistors. I used the circuit shown here: http://www.tcaas.btinternet.co.uk/hiraga3.htm The only change I've made is the value of the bias resistors so that I get 2A quiescent current. I also used a computer to match the small signal transistors - the system measures them and then the software determines the closest match. And I'm not using all that capacitance; I use 4x10,000 uF BCH caps per rail on each monoblock. If you do the PCB tracing and wiring correctly, you'll get no hum at all.


J.Guilherme
  Reply With Quote
Old 22nd January 2008, 11:56 PM   #66
danieljw is offline danieljw  Australia
diyAudio Member
 
danieljw's Avatar
 
Join Date: Jan 2005
Location: South Australia
Send a message via MSN to danieljw
thankyou for the info !
  Reply With Quote
Old 2nd February 2008, 04:41 PM   #67
gentlevoice is offline gentlevoice  Denmark
diyAudio Member
 
Join Date: Oct 2007
Location: Denmark
Hiraga 20W class A
Default Selection of components

Hi grataku,

Looks interesting with the 20W amplifier. I built some versions of the "Le Monstre", which in my opinion sounded "good" and belied its power of 8 watts. I have also built the "Kaneda" pre-amplifier and "Le Pre-Pre" moving coil cartridge amplifier.

One of my experiences with L'Audiophile circuitry is that their sound can be quite sensitive to the choice of components. In my memory the choice of components was one of the areas where L'Audiophile put quite some effort, be that in terms of transistors, resistors, capacitors or .... ? Not to say that their choice of components will work well in your system - just mention it.

I have built amplifier circuitries of a complexity similar to "Le Monstre" on balsa -wood boards, which in my opinion makes the sound softer, more open and effortless. Maybe due to much less dielectric absorption ? These amplifiers were wide-band (MHz cut-off frequency), single-ended designs and sound-wise and stability-wise they profited from placing small ferrite beads (like those used e.g. on computer mainboards) on the transistor legs. I used these beads both on the small-signal transistors and output transistors.

Anyway, the best for your efforts,

Jesper
  Reply With Quote
Old 19th February 2008, 08:04 PM   #68
triton76 is offline triton76  Germany
diyAudio Member
 
Join Date: Mar 2006
Location: Aalen
Send a message via AIM to triton76 Send a message via MSN to triton76 Send a message via Yahoo to triton76
Default balanced input for Hiraga ?

older thread - new question:
I'm not that strong in circuit design, but if I'm right it shouldn't be to difficult to implement a balanced input @ Hiraga ... anybody an idea about dimensioning & best strategy (esp. 'point of input' & input impedance)

thanks

Tilman
  Reply With Quote
Old 19th February 2008, 08:34 PM   #69
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
I have 7 page pdf may 07 silicon chip mag article...

Little short on bandwith, willing to share with someone who will share around again...
  Reply With Quote
Old 19th February 2008, 08:40 PM   #70
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Hiraga 20W class A
Quote:
Originally posted by Nordic
I have 7 page pdf may 07 silicon chip mag article...

Little short on bandwith, willing to share with someone who will share around again...
shoot me with this file

to >sasica5@gmail.com<

and I'll see what I can do .......
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote

Reply


Hiraga 20W class AHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Dynaudio + Hiraga Class A maartentje Multi-Way 7 30th April 2010 12:20 PM
Hiraga 20w AB class search? tadiam Solid State 0 18th April 2008 06:47 PM
Hiraga 30w PSU azoran Solid State 0 1st April 2007 03:32 AM
Hiraga 20W Class-A Geoff Solid State 8 5th November 2003 05:55 PM
Hiraga Class-A Geoff Solid State 14 17th July 2001 04:58 PM


New To Site? Need Help?

All times are GMT. The time now is 03:37 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki