Chip Amp Photo Gallery

[CECCO]

buffer detail

 

[udailey]

That looks great! One of the best ever!
So, when did you get approval for your CE mark?

 

[Pato666]

Bellissimo!

WOW, that's an amazing job! Well done!

 

[FastEddy]

CECCO: Too cool by twice ...

Does it really need that fan?

And did you coat the healthy bus bars? ... With?

 

[CECCO]

Hi guys.

The bar is an RF wire silver coated.
That's a useless feature, just cosmetic.
I get it at work.

The baby sounds good.
The only concern is that after a while of listening at half power (or more) the heatsinks are getting hot.
The supply voltage is +/- 36V, that's why the power dissipation is high.
The fan "sucks" out the air that enters from the holes under the heatsinks.

 

[pacificblue]

So, when did you get approval for your CE mark?

There is no such thing as an approval for a CE mark. Those marks are freely available. By sticking that on manufacturers guarantee that the equipment complys with all relevant norms, laws and regulations in the EU. What makes it even more ridiculous is that all manufacturers are obliged to stick it on their equipment, as soon as they bring it into traffic in the EU.

 

[Igla]

Here is my second attempt on Cmoy amp. It is still a half-prototype but way better looking then my first Cmoy. Input caps are Epcos MKT (blue color) and the red Wimas are for active bass-boost on OPA2132 fedback. The 50k pot is to adjust the amount of bass from 0 to +12dB or so. The second chip is KIA 4558F and is used as voltage splitter to get +-4.5V from 9V battery.
Well, I couldn't find Altoids around here so this tin can is the best thing I could get in a hurry to finish the project.

 

[Igla]

And with removed cover...

 

[kscharf]

My Gainclone Project

Here are some photos of my first gain clone. Amplifier with separate
power humpty dumpty.

 

[kscharf]

My Gainclone Project

inside photo.
The PC boards are el-cheapos from ebay Hong Kong. I improved upon
a less than perfect pc layout by soldering the feedback resistor directly
to the pins of the IC.

 

[kscharf]

My Gainclone Project

Inside the power humpty dumpty.
I used three surplus power transformers in series to give 21-0-21 at 4 amps.

 

[kuldeepsingh]

@ Igla

can you give show bass boost schematic for ur cmoy. i also made a headphone amplifier as a Mini3 clonehttp://kuldeep.biz/2009/06/mini3-inspired-headphone-amplifier.html . i wish to add bass boost in this

 

[Igla]

No problem; here it is...
Regards

 

[kuldeepsingh]

thanx for sharing, i guess its a low pass shelving filter.

 

[Igla]

I guess it is, but I'm not really familiar with active filter names.
I was just surfing the net for any other bass boost version but found nothing much.
Have any of you guys a schematic for a different aproach to get active bass boost?

 

[kuldeepsingh]

Filter theory and Types - http://www.linkwitzlab.com/filters.htm

 

[kuldeepsingh]

DIY Mini3 headphone amplifier clone

its a 3 channel headphone amplifier with precision virtual rail splitter

http://2.bp.blogspot.com/_ff7S7z_e7bI/Sj_mlve2iMI/AAAAAAAADTA/unlaup7GE2Y/s1600-h/100_2777.JPG

http://3.bp.blogspot.com/_ff7S7z_e7bI/Sj_msf28UrI/AAAAAAAADTQ/orT3B1fgNtY/s1600-h/100_2779.JPG

 

[huseying]

Here is mine (lm3875)

An externally hosted image should be here but it was not working when we last tested it.

It is very small,but ý'm stisfied
its power stage contains a transformator (150w),two bridge,and four cap (10,000 uf)
PCBs is very small

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[Pato666]

lovely case!
I really like the case you built.

Nice design, thanks for sharing.

 

[kscharf]

Nice job.

Wow those rf chokes are HUGE!
What are they wound around?

What are the dimensions of the box?