Amp 32 Pics + Review - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 2nd November 2006, 09:18 PM   #1
Xspunge is offline Xspunge  United States
diyAudio Member
 
Join Date: Jul 2006
Default Amp 32 Pics + Review

As always a big thanks to Jan for making the Amp 32 Kits. They are truly the smallest amps available. If someone has made one smaller, I'd like to see it. For only $25 US you can't beat the price if you can solder SMD/SMT.

Anyway here are some pics

http://s101.photobucket.com/albums/m59/Xspunge/?

and the website where you can get this amp is

www.41hz.com


Trying to get the amp into the case was harder than I thought. Trying to come up with a logical layout and clean looks was a little frustrating, and took a couple of tries. I had to desolder the original wires, cut them down, and when I found out they still wouldn't fit I had to go with even smaller gauge wires.

I tried going with an even smaller case, but it wouldn't allow me to mount the speaker terminals, or leave enough room for my voltage regulator.

The kit went together somewhat easily. I was sent the wrong instructions (I received the one for the original Amp 3 which is larger and has a different layout), so I tried to solder this kit using outdated info. Its pretty similar, but there are a few differences that slowed construction time way down.

Some of capacitors are numbered differently so it was up to me to figure out where they went. The diodes are also laid out different on the two boards so my amp did not work on my first power up attempt. Some minor gripes I had are that the soldering holes for the speaker outputs and power source are quite small. You can only use something like 20 gauge, or at the very most 18 gauge. The holes for the jumper/mute switch and LED are even smaller so that you have to use 24 gauge wires. Also, I do wish that the resistors were all of uniform size. The kit uses smd resistors that are two different sizes. It would have been nice if the board used the larger size resistors, but that might just be my personal perference. Also, I did happen to drop some of the caps and resistors a few times when trying to solder them. As always SMD and SMT things are a royal pain to try and find on the floor. Using a homemade hold down helped some, but things still flew off on their merry way a few times... almost never to be seen again. Thankfully they didn't fly far otherwise you wouldn't be reading this review.

So after finishing soldering the wires, I anxiously hooked it up to my speakers and mp3 player for testing. All I got was a faint repeated soft clicking noise.

After emailing Jan, he apologized for sending me the Amp3 instructions and sent me the correct AMP 32 instructions. After going over the new ones it turns out the diodes and their orientations are changed in the new amp. After changing their directions as specified in the new instructions the amp worked as promised and I got nothing but pure clean sound.

In regards to performance, it sounds very similar to my Amp 6 Basic. It is clear, with strong bass, and as expected sounded better than my baseline Sonic T Amp. And another important feature is that volume is increased Vs. the T Amp (although I will state that I increased the gain on all my amps in relation to the resistors given in the kits). I mainly use this for my portable speaker system and use my MP3 player as my audio source/preamp.

It does seem to have a little more bass than my Amp 6 Basic, but that just could be due to the 5% +/- variances in values given for resistors. I already knew what to expect in sound quality as many people rave about Jan's amps, and since I am a repeat customer of his, the sound quality came as no surprise. You won't be disappointed with any of his amps and if you are looking for something small, tiny, and has lots of power, and most importantly you can solder smt/smd then by all means get this amp. You won't find one smaller, cheaper, or better sounding for the price. And that is something we can all appreciate. If you cannot work with SMD/SMT then your best bet is go for the AMP 6 Basic since it is through hole based and the components are much easier to see and find. You will get the same great sound at sizes much friendlier on the eyes and fingers.
  Reply With Quote
Old 2nd November 2006, 10:02 PM   #2
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Default Re: Amp 32 Pics + Review

Quote:
Originally posted by Xspunge
As always a big thanks to Jan for making the Amp 32 Kits. They are truly the smallest amps available.

Anyway here are some pics

http://s101.photobucket.com/albums/m59/Xspunge/?


this is great build.

gychang
  Reply With Quote
Old 2nd November 2006, 10:41 PM   #3
Bearman is offline Bearman  United States
diyAudio Member
 
Join Date: Apr 2005
Location: Utah
I think the new SMD inductors for the AMP32 make a difference in the bass also.
  Reply With Quote
Old 10th November 2006, 03:53 AM   #4
v-bro is offline v-bro  Netherlands
diyAudio Member
 
v-bro's Avatar
 
Join Date: May 2006
Nice builds!

I've just recieved four amp32 kits, for me and some friends. Though I have a larger mc4x100 from audiodigit and heard a couple of TA 2020 based amps I am only familiar with the sonic t-amp when it comes to really small size. I am really curious to what the amp32 sounds like, can any of you share some more experiences compared to other amps?

I was thinking alu casing myself and keep them really small and light as I intend to use them portable too (on bikes, in cars and at the beach etc.).

I have to add Jan is a true sport and gave 100% support, also received the package really quick!
__________________
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
  Reply With Quote
Old 12th November 2006, 05:33 AM   #5
Xspunge is offline Xspunge  United States
diyAudio Member
 
Join Date: Jul 2006
You'll love the AMp32. I just built my 2nd one and I added LED's to both. I know you asked about sound quality, but here is one tip, don't add the LED to the area specified in the instructions. I haven't been able to get one to light up at that location for some reason. I junked the small red one and went for a multicolor LED that changes R>G>B in intervals of 5 seconds, they fade out and the other color fades in. Very cool.

In any case, If you solder the LED to the power source input (but on the opposite side of the board, it is much easier to access, much easier to solder since you aren't next to the chip. And it still functions the same.

Another tip, increase the gain. the supplied resistors for the feedback loop don't have enough gain for MP3 players. Trust me on this one, I have increased the gain on all my 41Hz amps (2 Amp 6 Basics, and 2 Amp 32's). Instead of using the supplied 22k ohm in the R2 and R4 I used 10k ohm and used the stock 47k ohm resistors on the R5 and R6.

On my first one I used 22k ohm on the R2 and R4, and 68k ohm on the R5 and R6.

One other tip, you CAN fit 1206 size smt resistors if you feel like changing some of the values on the amp. The kit uses mostly smaller 805 size and the pads are sized accordingly. The 1206's are slightly longer and look to be too long to contact the pads, but they will fit. So if you don't have access to the smaller 805's and can only get 1206 size smt resistors, they will fit. The kit does use a couple of the 1206 size but not for the feedback loop/gain loop. It was pretty nerve wracking trying to squeeze a 1206 size resistor on the R5 and R6 pad then testing the board after finishing.


Also, you probably don't want to use both types of input caps (the 2.2uF smd caps and 3.3uF electrolytic caps) at the same time. The instructions say you can use both at the same time, but if you do, you get a really harsh turn on thump. So just choose one or the other (as you can see in the pic I chose the 3.3uF electrolytics)

So, finally, you will love the sound quality. It is outstanding and I cannot recommend it more. Most others are pretty impressed too, and usually even more so when they see how small the unit is. ONce you get yours done, and your friends do too, you won't be sorry, its great to have an amp as small as your MP3 player.
  Reply With Quote
Old 12th November 2006, 06:20 AM   #6
v-bro is offline v-bro  Netherlands
diyAudio Member
 
v-bro's Avatar
 
Join Date: May 2006
Don't know how to thank you for that info, I could use a series parallel offboard resistor network to gain it down to line-level, not?

still have to find the time.....
__________________
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
  Reply With Quote
Old 12th November 2006, 07:32 PM   #7
Xspunge is offline Xspunge  United States
diyAudio Member
 
Join Date: Jul 2006
I am sure you could use off board resistors network, but since i haven't tried that I couldn't tell you how to do it. How high is the output level on your input source? You could always decrease gain by using the lower value resistors, i.e. 22k for both the R2/R4 and R5/R6 portions of the loop, or some other value if you need to go even lower.
  Reply With Quote
Old 13th November 2006, 03:09 AM   #8
v-bro is offline v-bro  Netherlands
diyAudio Member
 
v-bro's Avatar
 
Join Date: May 2006
Thanks for your response, I use attenuators with resistors (ladder attenuator). Doesn't that actually do the same, "set the gain"?

Couldn't keep myself from posting a pic of the pcb, look how small it is!!!!!!!!!!
Attached Images
File Type: jpg amp32.jpg (58.5 KB, 1215 views)
__________________
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
  Reply With Quote
Old 13th November 2006, 04:48 PM   #9
speaker is offline speaker  United States
diyAudio Member
 
speaker's Avatar
 
Join Date: Mar 2004
Location: USA
Default Re: Amp 32 Pics + Review

Quote:
Originally posted by Xspunge
Anyway here are some pics
What exactly is going on with the driver placement on the iPod boombox? It looks like a dual 3-way set-up with the mids firing to the right & left, the woofers firing fore & aft, & the tweeter firing forward.

  Reply With Quote
Old 13th November 2006, 09:14 PM   #10
v-bro is offline v-bro  Netherlands
diyAudio Member
 
v-bro's Avatar
 
Join Date: May 2006
I guess it's more of an easthetic thing...

And it does look cool..
__________________
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
  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
CSS El3 review Matthew P. Multi-Way 10 17th September 2007 02:50 AM
for review markmelheim Multi-Way 2 16th May 2005 02:42 AM
Pinoy DiY'ers, FT1600 pics..pics dranreb&* Full Range 5 3rd November 2004 11:21 PM
PICS: GainClone Monoblock pics Rarkov Chip Amps 19 17th April 2003 08:37 AM


New To Site? Need Help?

All times are GMT. The time now is 03:58 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