My gainclone building experience (updated as I go along) - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 6th May 2003, 06:50 PM   #1
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
Default My gainclone building experience (updated as I go along)

Well, yesterday I finished one channel of my gainclone.
I managed to find a couple small cases for the amps themselves, which fit perfectly!!!

I also got a couple smaller cpu heatsinks on which i mounted the chips.

I encountered the first problem when cutting the pins off of the chips .. I cut off pin #4
but i left enough so i was able to solder a small piece of wire to it!!! *whew*

The PS section is complete as well, except for the toroid, which isn't shipped until may 23rd. The bridge is all in place and mounted, as well everything is hooked up.

So tomorrow I'm going to do the other channel, and hopefully have just as much luck as I did with this one.

Btw, is there any way I can test anything with the amp w/o a transformer? (Somehow I don't think so ....)
Anyway, I'll keep you guys up to date, and I will take pictures when I get a digicam from a friend.
  Reply With Quote
Old 6th May 2003, 07:50 PM   #2
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
do you have a bench power supply? i tested my gainclone with mine before i made the power supply.
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote
Old 6th May 2003, 08:33 PM   #3
diyAudio Member
 
Join Date: Mar 2003
Location: Windsor
Default Do You Have A Plug In Transformer???

You could possibly test your wirong using a plug in type wall transformer. Assuming you have one lying around with suitable ratings (fortunately I did 20V 2A). Elliot Sound Products has an example of how to do this. At the very least you will know if your soldering is correct. You can't get too much juice this way, but at the very least you can see if you get sound and check for ground loops, etc.
  Reply With Quote
Old 6th May 2003, 09:12 PM   #4
spind is offline spind  Canada
diyAudio Member
 
Join Date: Feb 2003
Location: Winnipeg
Default wanna borrow one?

Hi,

My 225 VA 18-0-18 is just sitting here--wanna borrow it and play until yours gets delivered? Contact me offline if you want to pick it up.

Steve
  Reply With Quote
Old 8th May 2003, 02:53 AM   #5
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
Default transformers

Finished the second channel of the gainclone. All that's left to do is put the transformer in!

Well .. I just took apart a couple PA amps, and am now in possesion of 3 transformers

All are single secondaries, and they are 15V (or 13 .. don't remember), 26V and 37V .. all approximate, measured on my multimeter w/o a load attached

Now, my question is, just for testing purposes, can I make use of any of these (or a combination thereof) in order to power up my GC's.
I would be very thankful for any suggestions or schematics if possible, otherwise I'll probably borrow from spind.
Although I wouldn't want to borrow for risk of blowing the toroid (with my luck .. only with my luck!)

Thanks
  Reply With Quote
Old 8th May 2003, 03:06 AM   #6
diyAudio Member
 
JOE DIRT®'s Avatar
 
Join Date: Apr 2003
Location: Brantford, ON
elizard...thats a big question.....having a transformer...(we all have lots).....the lower voltage ones could be useful for a preamp and the higher voltage could make be good for an amplifier...but your along away from anything and there are tons of designs out there...if you want a particular application we can point you in the right direction.....everyone here is great that way!!


Cheers!!The DIRT®
  Reply With Quote
Old 8th May 2003, 03:08 AM   #7
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
i suppose my question sucked eh ..

ok, here's the deal
i have built the gainclones .. and am waiting for the toroid to arrive in mail (shipped may 23rd .. blah) ..
so what i was wondering is if i could use one of the transformers (or 2 ..) just to power up the gainclones for testing purposes?

since they're single secondary, i don't know how to hook them up .. well i do, but i don't know how to deal w/ the fact they have different voltages ....

thanks
  Reply With Quote
Old 8th May 2003, 02:35 PM   #8
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
anyone has ideas?
  Reply With Quote
Old 9th May 2003, 12:21 AM   #9
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
hmmz .. still no answer
am i to believe it can't be done? should i give up and just humbly wait for my toroid?
  Reply With Quote
Old 9th May 2003, 01:24 AM   #10
Philo is offline Philo  United States
diyAudio Member
 
Join Date: Jul 2002
Location: Ever sunny San Diego
elizard,
You would need two single secondary transformers of the same rating to supply the positive and negative for the op amp. Remember, the unused output of each bridge is tied to ground. Now, some of the Burr-Brown opamps (like opa541) can operate on a single supply with the neg pin tied to ground or in an unbalanced configuration (ie -15 and +12) as long as it doesn't excede the maximum absolute voltage rating but, as I understand it, they don't sound very good in that configuration.
__________________
Philip
"If you didn't make it with your own two hands, its not really yours".
  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
Anybody have experience building an OTL amp? jduffy Tubes / Valves 8 6th February 2007 04:46 PM
My experience building a DRD d3A/300B amp ligascon Tubes / Valves 50 31st October 2005 11:33 PM
Interesting amp building experience... BANG! SHiFTY Solid State 8 3rd April 2003 08:47 PM


New To Site? Need Help?

All times are GMT. The time now is 09:41 PM.


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