Chip Amp Photo Gallery - Page 246

palstanturhin · 16th July 2013, 06:48 AM

Quote:

Originally Posted by redjr

Are those custom PCBs, or available commercially?

They are my own...

Quote:

Originally Posted by benb

If only you could get that small heatsink with fins going "horizontally"...

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

Rainwulf · 19th July 2013, 05:41 AM

you could sell kits of them! i would buy them thats for sure! they look amazing!

lanchile · 19th July 2013, 06:36 PM

Quote:

Originally Posted by palstanturhin

They are my own...

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

Wow, those pcb's are very nice! They look Professional grade!

Mihkus · 12:25 PM

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...

image upload no compression

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

mrWagner · 21st July 2013, 10:56 AM

Some more pic from the finished dual mono lm3875 amps.
And a little passive "preamp".
Assembled
Inside
Preamp

dasazo · 28th July 2013, 08:23 AM

Hey all!

Just finished my first amplifier project! Before had only experiences on building couple of DAC´s 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

Rainwulf · 30th July 2013, 12:31 AM

Well done! You have some unshielded signal wires though, and they will pick up interference.

mhouston · 30th July 2013, 02:09 AM

Mihkus: the amp maybe oscilating. This could cause the HS to get hot. Chip amps can do this easy.

Mihkus · 30th July 2013, 01:22 PM

Quote:

Originally Posted by mhouston

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

gadut · 31st July 2013, 04:04 PM

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

20th July 2013, 12:07 PM	#2454
Mihkus diyAudio Member Join Date: Jul 2012	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... 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.

30th July 2013, 02:09 AM	#2458
mhouston diyAudio Member Join Date: Jan 2006 Location: Victoria, Australia	Mihkus: the amp maybe oscilating. This could cause the HS to get hot. Chip amps can do this easy. __________________ \| "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp \| \| "retro-Oatley 6J6" 6J6 push-pull headphone amp with OPTs \| \| "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp

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19th July 2013, 05:41 AM	#2452
Rainwulf diyAudio Member Join Date: Feb 2009	you could sell kits of them! i would buy them thats for sure! they look amazing!

21st July 2013, 10:56 AM	#2455
mrWagner diyAudio Member Join Date: Oct 2006	Some more pic from the finished dual mono lm3875 amps. And a little passive "preamp". Assembled Inside Preamp

28th July 2013, 08:23 AM	#2456
dasazo diyAudio Member Join Date: Jul 2013	Hey all! Just finished my first amplifier project! Before had only experiences on building couple of DAC´s 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

30th July 2013, 12:31 AM	#2457
Rainwulf diyAudio Member Join Date: Feb 2009	Well done! You have some unshielded signal wires though, and they will pick up interference.