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Chip Amps Amplifiers based on integrated circuits

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Old 11th July 2010, 12:27 AM   #1481
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...
I wrote a quick and dirty guide below for bending aluminium if anyones interested in making their own chassis
http://bit.ly/d7ayVE
Cheers mate - very helpful indeed!
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Old 13th July 2010, 07:39 AM   #1482
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A few pages back i showed the start of my bpa 300 for my subwoofer. The amplifier will have a dual purpose. It will be swticheable beteen bridge and stereo more.

The filter circuit containing a linkwitz transform and parametric EQ can be switcheable. this circuit also contains the inverting and non inverting output for bridge mode.

In the last photo you can see it sitting next to my other gainclones.

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Old 25th July 2010, 08:33 AM   #1483
ss007 is offline ss007  United States
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Not an amp but a fun pic my buddy took of a couple LME49720HA opamps on a dirty MDF workbench at my shop.
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Old 25th July 2010, 05:29 PM   #1484
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They look like some kind of UFO spaceships
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Old 27th July 2010, 02:15 AM   #1485
Pato666 is offline Pato666  Argentina
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Quite an artist that friend of yours... I like it a lot, thanks for sharing
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Old 1st August 2010, 02:34 PM   #1486
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My finished LM3875 dual mono Audiosector premium kit. Passive attenuator is an Alps Blue (50k dual log, with a 47k metal film shunt). Dual input, dual output. It also contains a Sekerez designed class A, single MOSFET (per channel) headphone amp, which is completely switched out of the Gainclone circuit.

Chris.
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File Type: jpg ore internal.JPG (162.2 KB, 696 views)
File Type: jpg power internal.JPG (167.0 KB, 637 views)
File Type: jpg amps.JPG (81.2 KB, 558 views)
File Type: jpg power rear.JPG (101.4 KB, 378 views)
File Type: jpg pre front.JPG (93.1 KB, 399 views)
File Type: jpg pre rear.JPG (102.0 KB, 324 views)
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Old 1st August 2010, 05:30 PM   #1487
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Just to clarify, the passive attenuator is dual in/out, the power amp is dual mono. The class A headphone amp is not connected to the LM3875 whan selected.
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Old 1st August 2010, 06:55 PM   #1488
ss007 is offline ss007  United States
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Looks great!

A newbie question. What is the purpose of the 47K shunt resistor before the pot?
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Old 1st August 2010, 07:15 PM   #1489
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Originally Posted by ss007 View Post
Looks great!

A newbie question. What is the purpose of the 47K shunt resistor before the pot?
You'll notice that the pot is connected to the ground connection. The 47k resistor and the 50k pot make up a simple voltage divider network. The output (to the power amp) is taken from the centre of the voltage divider network. This means that none of the signal goes through the wiper of the pot. The pot is effectively out of the system, which in my opinion yields sonic improvements.

Chris.
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Old 1st August 2010, 07:23 PM   #1490
ss007 is offline ss007  United States
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Got it! Thanks for the info. Scott
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