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Chip Amps Amplifiers based on integrated circuits

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Old 16th July 2013, 06:48 AM   #2451
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Quote:
Originally Posted by redjr View Post
Are those custom PCBs, or available commercially?
They are my own...

Quote:
Originally Posted by benb View Post
If only you could get that small heatsink with fins going "horizontally"...
Good point! I will start hunting for those...
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Old 19th July 2013, 05:41 AM   #2452
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you could sell kits of them! i would buy them thats for sure! they look amazing!
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Old 19th July 2013, 06:36 PM   #2453
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Quote:
Originally Posted by palstanturhin View Post
They are my own...



Good point! I will start hunting for those...

Wow, those pcb's are very nice! They look Professional grade!
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Old 20th July 2013, 12:07 PM   #2454
Mihkus is offline Mihkus  Estonia
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My amplifier made out of junk... Its even sounds like junk

Ebay LM4766 board, long supply rails, full of loops, HF oscillation heats even the biggest heatsink to melting point -.-

Case is made of aluminium faceplate, cut it out with angle grinder-.-
Black steel part is battery charger than caught on fire after charging small 12V leadacid battery...
Spray painted it black and there it goes, gifted away anyway.

Toroid transformer in the back is handwound, even primary is handwound by me.
I know it looks pretty cool from the outside but, i hate the look inside.

Built withing 2 hours...

Click the image to open in full size.

Click the image to open in full size.
image upload no compression


Ive made same looking PCBS before drilling spray paint it over. there are very strong spray paints
Even heatproof.

Last edited by Mihkus; 20th July 2013 at 12:25 PM.
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Old 21st July 2013, 10:56 AM   #2455
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Some more pic from the finished dual mono lm3875 amps.
And a little passive "preamp".
Assembled
Inside
Preamp
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Old 28th July 2013, 08:23 AM   #2456
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Hey all!

Just finished my first amplifier project! Before had only experiences on building couple of DACīs from kit.

Here is the picture on the insides. Still need to apply thermal grease to chips and regulators, cut potentiometer shaft to fit knob and heat couple of heat shrink tubes.

I am really impressed on the performance. LM3875 chips drive 6 ohm/88dB wharfedales suprisingly nice. I am planning on building new speakers with audionirvana fullranges to pair with this amp!

Unfortunately I have just laid my eyes on myref as the performance of simple LM3875 design is so stunning. Maybe I will have two chip amps soon

Lm3875 inside
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Old 30th July 2013, 12:31 AM   #2457
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Well done! You have some unshielded signal wires though, and they will pick up interference.
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Old 30th July 2013, 02:09 AM   #2458
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Mihkus: the amp maybe oscilating. This could cause the HS to get hot. Chip amps can do this easy.
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Old 30th July 2013, 01:22 PM   #2459
Mihkus is offline Mihkus  Estonia
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Quote:
Originally Posted by mhouston View Post
Mihkus: the amp maybe oscilating. This could cause the HS to get hot. Chip amps can do this easy.
Fixed already, those 0,1uf HF filters close to chip Vee and Vcc were just 2 yellow plastic boxes with 2 leads on...
I even had a bit space to install 2 bigger filters very close to chip.
It remains cool now but i blew 1 channel up cuz my one of the leads on terminals
were shorted with gnd, lots of smoke... But 1 channel is working, going to change chip very soon and make new wood base just for look.

Sorry for post without picture
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Old 31st July 2013, 04:04 PM   #2460
gadut is offline gadut  Indonesia
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Finally completed my my_ref rev c. I have increased relay delay time by changing R21 into 470K, i get around 2sec delay as my expectation. another softstart also help much.

Never thought that my first amp will be this great

next -> pcb B1, DCB1, Aleph-J is on the way, more soldering is coming
Attached Images
File Type: jpg MP_Top_Front.jpg (60.4 KB, 941 views)
File Type: jpg MP_Front.jpg (43.8 KB, 924 views)
File Type: jpg MP_Top.jpg (77.4 KB, 928 views)
File Type: jpg MP_Detail.jpg (90.0 KB, 449 views)
File Type: jpg MP_Back_Plug.jpg (53.7 KB, 382 views)
File Type: jpg MP_Back.jpg (47.1 KB, 292 views)
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