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Old 8th November 2006, 06:16 PM   #201
kmj is online now kmj  Sweden
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Quote:
I might suggest adding one or two plastic snubbing capacitors to the pre-amp power supply at the PS output rails ... 0.1 to 1.0 uF MKS type (sprague or other) should do it.
I think I already got that. There's a couple of plastic caps right after the regulators, between rail and ground. Later there's a 47uF electrolytic cap in parallell with a 100nF plasic just before the supplypins of the OP-amps. Since I etched the PCBs mirrorimaged I had to mount the OPs on the copperside while the other components are on the other.

Here's the layout.
The Freebird by Russ White
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Old 8th November 2006, 07:47 PM   #202
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kmj:

Yes, I see: 100 nF (0.1 uF) right there on your silk screen/board designations ...

Looks like a very good board layout as well ... plenty of ground plane around the output, etc.

One might assume then that the hum is from an outside radiation source ...
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Old 9th November 2006, 07:58 AM   #203
kmj is online now kmj  Sweden
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Quote:
One might assume then that the hum is from an outside radiation source ...
yes, probably
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Old 30th November 2006, 10:09 AM   #204
tmyr is offline tmyr  Greece
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..hi to everybody..

this wonderfull "chip amp" thread motivated me to use my scrap pile and assemble one to acompany a small woofer for my experimental esl's ..

.. so i take the opportunity to present you my "sandwich" realisation..

all in one chassis-monoblock, transformers are doubled to get center tap from 17vac outputs and 220vac (2x110) input, rectifiers are doubled because i had them, capacitor bank is not that big as they are 470f/200v each from pc psu's x12, tda1514 is shelded from ps with unetched grounded boards ..

here is what i mean :
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Old 30th November 2006, 10:10 AM   #205
tmyr is offline tmyr  Greece
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.. another view of the sandwich :
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Old 30th November 2006, 10:13 AM   #206
tmyr is offline tmyr  Greece
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.. the tda1514a is wired directly on its pins ..
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Old 30th November 2006, 10:17 AM   #207
karma is offline karma  Canada
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nice p2p
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Old 30th November 2006, 10:25 AM   #208
tmyr is offline tmyr  Greece
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.. and a closer shot of the chips wires and parts..

this is the simplest of the datasheets application cirquit without the bootstrap .. i dont know if this is better or not, except for the comment of the datasheet saying i'll loose some 4 watts of output..

..if someone could explain in simple words the bootstrap effect on cirquirtry and audio quality i would appreciate it mucho..
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Old 2nd December 2006, 11:10 AM   #209
keps is offline keps  Philippines
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Default My First NIGC

Just sharing my first kit I got from Madaboutsound.

NIGC Monoblocks
Click the image to open in full size.

Click the image to open in full size.

I'll change the casing for the monoblocks if I find a better one
thanks for looking...
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Old 2nd December 2006, 01:56 PM   #210
VLSI is offline VLSI  Australia
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Hi Audio Chippers

My first post.
I am very excited to have joined this wonderful community.
This is my first LM3875 based amp (hoping the photo uploaded) built in Jan 2003 before I had heard of GC or diyAudio, Parts and PCB are far from ideal but it sounds better than many Hi Fi amps I have auditioned.
PS is through the DB25, +/-42v. Also tried with +/-36v batteries but sounds much the same.
Have built 7 more amps with the LM3886 and another 3 using paralleled LM4780 the first in Aug 2003, They all sound much the same with just very subtle differences.
I have more photos if anyone is interested?
Just finished a paralleled LM4780 with regulated power supplies (+/- 38v), Sounds very warm and probably the best sounding amp so far.
Now working with the LM4702
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