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Old 3rd August 2011, 11:47 PM   #1
aris69 is offline aris69  Italy
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Default Arisphone

I am happy to share with you my creation, published in an Italian DIY magazine called "Costruire Hi-Fi"
It 'a headphone amplifier that uses two operational amplifiers opa2132.
Board size 60mm X 100mm with on board power supply.
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Old 4th August 2011, 02:45 AM   #2
Pano is offline Pano  United States
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Looks nice. Is this a kit, or a project with a schematic and BOM?
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Old 4th August 2011, 08:09 AM   #3
aris69 is offline aris69  Italy
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Quote:
Originally Posted by Pano View Post
Looks nice. Is this a kit, or a project with a schematic and BOM?
Hello.
It is not a kit. I was inspired by the figure of 9 in the datasheet OPA604. The input stage has been carefully studied. The OPA2132 operational amplifier has a bandwidth of 8 MHz, the bandwidth on my circuit is 3.5 Hz-60 kHz.
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Old 4th August 2011, 12:06 PM   #4
aris69 is offline aris69  Italy
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schematic of single channel

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Old 4th August 2011, 05:16 PM   #5
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any ready to assemble pcb available would be great
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Old 5th August 2011, 01:26 PM   #6
aris69 is offline aris69  Italy
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The power supply scheme is very simple. consists of the positive regulator 7812 and its complementary negative 7912. The power transformer is the type mounted on PCB 12 +12 V 3VA EI30 series. The bridge rectifier, KBL06 is mounted near the transformer, so it is not visible in the figure.
There are two leds for control -12 and +12V

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Old 6th August 2011, 05:41 PM   #7
Nanook is offline Nanook  Canada
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Default nice board. Perhaps a great "add on"...

to a Tripath based amp for headphones. Thinking others must want something similar to the Nuforce Icon integrated amp as a project. Now just need a passive RIAA stage, and suitable drivers (stereo microphone amp?) and a full featured integrated with hp amp/RIAA amp/and multiple inputs would be in the making, hey Pano?

Thanks for the troubleshooting on the amp6Basic, Pano. checked all the solder, and used a Dremmel tool w/jeweler bit to isolate any issues with any pads. Gotta clean it up, test, and then paint over the board with some nail polish (lacquer) to seal it all up. I think the "sneaky" version would be the one to use for a complete project. May have to get a larger enclosure...

Is this hp amp circuit board available?
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Old 6th August 2011, 08:56 PM   #8
aris69 is offline aris69  Italy
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Quote:
Originally Posted by Nanook View Post
to a Tripath based amp for headphones. Thinking others must want something similar to the Nuforce Icon integrated amp as a project. Now just need a passive RIAA stage, and suitable drivers (stereo microphone amp?) and a full featured integrated with hp amp/RIAA amp/and multiple inputs would be in the making, hey Pano?

Thanks for the troubleshooting on the amp6Basic, Pano. checked all the solder, and used a Dremmel tool w/jeweler bit to isolate any issues with any pads. Gotta clean it up, test, and then paint over the board with some nail polish (lacquer) to seal it all up. I think the "sneaky" version would be the one to use for a complete project. May have to get a larger enclosure...

Is this hp amp circuit board available?
i do not understand and excuse my for my bad english
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Old 6th August 2011, 09:16 PM   #9
Nanook is offline Nanook  Canada
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Default I don't understand...

Quote:
i do not understand and excuse my for my bad english
aris69,

it is I who owes an apology to you. Pano had helped me solve a problem I was having with a 41Hz amp6Basic. I had not meant to hijack your thread.

When I saw this thread, I thought your headphone amplifier, along with a Tripath amp (a kit, DIY from scratch, inexpensive eBay class "D" or "T" that could be improved), a few inputs with suitable switching, a passive RIAA phono preamplifier, a selectable gain microphone "head amp" to allow the use of MM or MC cartridges, and the largest possible suitable power supply could result in the creation of a (one of the very few) full featured digital integrated amplifier It would only be missing tone controls and a balance control, but most who have them should defeat those anyway.

Again, I am sorry if I seemed to hijack your thread, aris69.
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Old 6th August 2011, 10:04 PM   #10
aris69 is offline aris69  Italy
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No problem Nanook.
excuse me again.
The input stage of headphone amp is very accurate. Is very important to have pot 10K, I do not know if in your tripath amp and riia eq you can use 10K pot.
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