My First chip amp. - 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 25th May 2008, 02:34 AM   #1
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
Default My First chip amp.

I completed my first Velleman chipamp this afternoon. I'm pretty impressed by the sound of it. I bought it through Parts Express and the whole thing cost a little less than $60. I have a $40 volume and tone control kit on order to complete this project. Then comes the case. I've got some nice wood scraps and some pieces of anodized steel in my garage that will work perfect for a case.
I used some speakers from a Packard Bell tube stereo console I picked up at a second-hand store. They need a little tweaking, but they're not bad.
All in all, I didn't know what to expect from an inexpensive little kit with minimal parts. However, I think I'll be doing some more chip amp kits, or looking for tweaks for this one. I'm pretty impressed by the output of this little guy. I'm looking forward to building the volume and tone control kit and seeing how much it adds to the amp.
This kit is the Velleman K4003. I'll be adding a Velleman K8084 for the volume and tone control.
I'm new to this stuff, so I hope I can get a few pointers. Do any of you DIY-ers have any suggestions for tweaks? Better caps, maybe??? Can anyone offer a quick explanation of how this thing works, beyond the rectifier.
I have a power switch to add, and I have a question about that. What do I need to do to keep the amp from "popping" when I turn it on?
Again, any advice will be greatly appreciated!
Thanks,
Mike
Attached Images
File Type: jpg tda2616 chipamp1c.jpg (94.3 KB, 1398 views)
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 25th May 2008, 06:18 AM   #2
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Nice handywork!
Any hints on which chip it uses?
  Reply With Quote
Old 25th May 2008, 02:03 PM   #3
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
It uses a TDA2616. That's the one that came in the kit from PE; I think they might use others too, but that's what this kit had.
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 30th May 2008, 02:15 AM   #4
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
Well, I got the Velleman volume and tone control kit in the mail today and got it assembled. I don't know if this will work without the schematic, but I'll ask anyway. I was told by Skip at PE that I can wire both of the boards, which each use 12-0-12, off the same center tapped transformer. Can anyone shed some light on this? I can call Skip tomorrow, but I'm kind of anxious to try this out. I built some 3CR Tangbands that I'd like to hook-up to this amp, so I'm a little antsy.With that being said, I'm not in such a hurry that I'll risk damage to either of my projects. Thanks again all!
Mike
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 30th May 2008, 07:13 AM   #5
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Quote:
I was told by Skip at PE that I can wire both of the boards, which each use 12-0-12, off the same center tapped transformer. Can anyone shed some light on this?
Yes just double up on the connections.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 30th May 2008, 04:16 PM   #6
Paswa is offline Paswa  India
diyAudio Member
 
Paswa's Avatar
 
Join Date: Aug 2007
build or buy a good amplifier cabinet and put it inside it,,
  Reply With Quote
Old 31st May 2008, 08:03 AM   #7
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Here's the datasheet for the TDA2616.
  Reply With Quote
Old 31st May 2008, 11:58 AM   #8
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
DigitalJunkie,
Thanks for the info!!!
Mike
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 31st May 2008, 03:07 PM   #9
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
I think you can overcome the clicks by using the onboard mute function.... it would be a resitor to the mute pin that brings the current down to the amount needed to trigger it...

the resitor will go through a relay with the resitor connected so that it is in circuit while the relay is "off"... on the coil side of the relay slap a small electrolitic in parallel... and one resistor in the line going to the coil, to slowly charge up the capacitor for a second or two...

the capacitor acts like a short circuit until it is charged up to voltage.

So when you power on the capacitor starts charging, but does not allow the power to get to the relay coil... during this time the resistor you set up in the first step is receiving voltage and provding the current needed to keep the mute function on.

When the capacitor is charged, the relay will switch and the resitor powering the mute pin will be disconncted form the power source...


RE HUM

Do you get the hum trough your amp only or is it also there if you connect a speaker or headphone to your preamp ?

Can you tell us how you made the power supply of the premap... intersted in how you split the rails or if you are just useing a single ended supply...

I think it is totaly solveable... in fact I have never been able to make a cmoy hum...

I have a few things in mind that could probably fall together to form hum as a total system ( amp + pre+source).

I would start with only one input connected, bring the circuit down to its most basic implementation. Fix the hum problem, now start addingthe other channels... compare mains powered sources to something like an ipod source etc.... see if hum stays the same...
  Reply With Quote
Old 31st May 2008, 03:41 PM   #10
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
lol I seem to have posted in the wrong thread...
  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
Which Chip AMP you like most? dynabok Chip Amps 154 12th December 2012 01:23 PM
Pre-amp for chip amp wotsascott Chip Amps 23 30th April 2006 04:24 PM
First Chip Amp doomsweek Chip Amps 9 10th May 2005 01:55 AM
Best possible 10W from chip amp Robert_66 Chip Amps 14 2nd November 2004 11:43 AM
Hot chip! batkey Chip Amps 1 14th October 2004 11:54 AM


New To Site? Need Help?

All times are GMT. The time now is 03:29 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