Amp in a tin can (or what to do on a boring saturday afternoon) - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 19th January 2013, 10:39 PM   #1
diyAudio Member
Cro maniac's Avatar
Join Date: Feb 2004
Location: Zagreb, Croatia
Blog Entries: 2
Send a message via Skype™ to Cro maniac
Default Amp in a tin can (or what to do on a boring saturday afternoon)

What to do on saturday afternoon when one is extremely bored ? Build an amp out of materials found in junk-box and use tin can for enclosure of course

The amp is based on upc1230H2. It is an old NEC chipamp in SIL package configured as bridge amplifier designed for car stereo applications. Its power output is around 15W at 13V according to datasheet.
Wasn't expecting much from these chips as the datasheet states quite high distortion figures, but when I built the amp, I found it quite satisfactory. It's not audiophile stuff, but it does its job well.

For supply I used 9V AC adapter from an old US Robotics modem. Since it supplies only 1A of current, I "overdid" the capacitance to decrease the voltage sag and provide enough juice on transients, so it has around 22000 uF in total. I had a lot of low voltage 2200uF and 4700uF electrolytes hanging around, so thought, why not use them for this. Because these chips have low PSRR, filter capacitors are organized as CRC filter which I must say added a lot of weight to bass compared to low capacitance supply and PC power supply which I used to test the chips before.
The flaw of these chips is that they have very high gain set internally (55dB) and consequently produce more hum than what is expected to be normal. However, not enough to be heard from listening position.

Heatsinks and wires are reused from old broken power supplies, and the tin box is a wristwatch casing.

For power indicators I used blue LED's mounted underneath the box so they are illuminating the surface on which the mini amp is standing.

Pictures follow:
Attached Images
File Type: jpg 1.jpg (912.6 KB, 132 views)
File Type: jpg 2.jpg (967.8 KB, 120 views)
File Type: jpg 3.jpg (853.3 KB, 126 views)
File Type: jpg 4.jpg (766.4 KB, 114 views)
File Type: jpg 5.jpg (556.3 KB, 92 views)
File Type: jpg 6.jpg (761.0 KB, 54 views)
File Type: jpg 7.jpg (888.6 KB, 59 views)
File Type: jpg 8.jpg (788.3 KB, 68 views)
Attached Files
File Type: pdf 23WTyp.pdf (154.8 KB, 15935 views)

Last edited by Cro maniac; 19th January 2013 at 10:43 PM.
  Reply With Quote
Old 20th January 2013, 02:48 AM   #2
DUG is offline DUG  Canada
diyAudio Member
Join Date: Jan 2003
Location: mississauga ontario canada
I like it...especially the blue lights.
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 20th January 2013, 03:00 AM   #3
diyAudio Member
Join Date: Sep 2008
Love it! Neat little project. Congrats
  Reply With Quote
Old 20th January 2013, 12:28 PM   #4
JMFahey is offline JMFahey  Argentina
diyAudio Member
JMFahey's Avatar
Join Date: Mar 2009
Location: Buenos Aires - Argentina
COOL !!!!!
LOVED it !!!
  Reply With Quote


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
Hafler DH 220 amp sounds like tin can Robcf Solid State 16 1st July 2008 03:58 PM
Afternoon! sploo Introductions 12 21st March 2007 11:15 AM
Yet another boring tube headphone amp stokessd Headphone Systems 7 6th September 2003 06:12 AM

New To Site? Need Help?

All times are GMT. The time now is 07:59 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2