15yrs old Conrad kit: good enough trying? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 18th November 2004, 01:24 PM   #1
hiwiho is offline hiwiho  Germany
diyAudio Member
 
hiwiho's Avatar
 
Join Date: Sep 2004
Location: Berlin
Default 15yrs old Conrad kit: good enough trying?

Hey all,

it's beginning winter time and thus a good opportunity to warm up one's apartement with the soldering iron... It's not that I would really need another amp (I have an Onkyo 9711 for dedicated and a Sony TA-F210 for computer-based listening), but I have both an old external drive housing big enough and this old manual from an amplifier kit that Conrad Electronic sold 15yrs ago lying around (No.196274).

It's based on a couple of 2SK133/2J48 that would have to be replaced by either 2SK1058/2SJ162 or IRF530/IRF540, but anyway, is this circuit worth diying??? Most effort would be to layout the pcb which is not given in the manual.

The whole kit is rated 75(55)watts/4(8)ohms at +/- 44volts - a nice size for a spare amp and not needing that big hsink.

Yes, you will ask why I won't make a gainclone - but how many am I supposed to make during the long winter

Note: First thing to be changed would be the nf coupling 1uF cap to some non-electrolyte type

Matthias
Attached Images
File Type: gif conrad_mosfet_scheme.gif (47.2 KB, 345 views)
  Reply With Quote
Old 18th November 2004, 01:30 PM   #2
hiwiho is offline hiwiho  Germany
diyAudio Member
 
hiwiho's Avatar
 
Join Date: Sep 2004
Location: Berlin
Manuals first page. Maybe someone remembers it.
Attached Images
File Type: gif conrad_mosfet_title.gif (56.7 KB, 279 views)
  Reply With Quote
Old 18th November 2004, 01:41 PM   #3
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
It's basically the industry standard Hitachi MOSFET amp circuit. Performance is perfectly acceptable, but there are quite a few upgrades that can be done. You wouldn't be able to use IRF devices unless you added a Vbe multiplier instead of just the pot for bias.
  Reply With Quote
Old 18th November 2004, 01:43 PM   #4
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Yeah, it looks practically identical to the Maplin MOSFET Amplifier kit they used to produce up until early 2000 when they discontinued most of their kits.
  Reply With Quote
Old 18th November 2004, 02:57 PM   #5
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
I was going to say that If you want a play with IRF devices, have a look at IR App Note 948.

PS You look like Jerry Springer
  Reply With Quote
Old 18th November 2004, 03:06 PM   #6
hiwiho is offline hiwiho  Germany
diyAudio Member
 
hiwiho's Avatar
 
Join Date: Sep 2004
Location: Berlin
Hmm, well I'm no expert in construction electronics so I guess the hint concerning IRF was rather helpfull. I somewhere found them as replacement for the original trannies. I would get the first replacements I wrote easily just a few bus stops away at segor electronics so I would go with them anyway then.

Who is Jerry Springer?? But please note the Calexico poster up left. Some of the finest tunes around!!!

m atthias
  Reply With Quote
Old 18th November 2004, 09:33 PM   #7
zinsula is offline zinsula  Switzerland
diyAudio Member
 
zinsula's Avatar
 
Join Date: Mar 2004
Must be this, eh?

Power Amp Schematic

Ciao, Tino
  Reply With Quote
Old 18th November 2004, 09:35 PM   #8
hiwiho is offline hiwiho  Germany
diyAudio Member
 
hiwiho's Avatar
 
Join Date: Sep 2004
Location: Berlin
Ok, I checked out Jerry. He is some 30years older than I am but has less grey hair than I have now or a better makeup!

Thanks for mentioning the application note. I found it quite fast and will work through it in a couple of days!

Quote:
Must be this, eh?
Yeep, this looks pretty much the same. I think I will give that thing a try after the first snow has arrived.

Thanks all for your assistance!!

matthias
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
WBT Conrad MF35-151.5 nicoch58 Swap Meet 1 4th August 2009 09:34 AM
Conrad Heatsinks... EchoWars Solid State 8 15th November 2006 04:33 AM
Conrad Heatsinks GB in GB/EU bremen nacht Parts 1 1st February 2006 08:48 PM
just got new heatsinks from Conrad Jean Parts 8 6th June 2004 03:09 PM
conrad johnson help efoda Tubes / Valves 3 24th January 2002 03:23 AM


New To Site? Need Help?

All times are GMT. The time now is 01:52 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