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Chip Amps Amplifiers based on integrated circuits

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Old 19th April 2011, 05:18 PM   #1761
troystg is offline troystg  United States
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Quote:
Originally Posted by digits View Post
Lol, that rev C is a way underutilisation of that carver case.
Absolutely but the price was good (free)...

PS, so I passed that cost on to the owner.
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Old 22nd April 2011, 12:59 PM   #1762
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2xtda7294 & IR2153
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sorry for repeat, images are lost...
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Old 28th April 2011, 01:10 PM   #1763
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Default My 4 channel LM3886 amp

Hello everybody,

I have been looking around this tread for some time now, so I thought let's post some pictures!

The amp is based on the BrianGT PCB, the power supply consists of 2 SMPS (26V 13.2A) working as a bipolar supply with a lot of added filtering. For this filter I made my own inductors which work perfectly well for this application! The amp is used to actively bi-amp my monitor speakers (I use an active Samson Audio XO, 3 way 24dB LR). The monitors are now being build (no XO in the monitor except for a capacitor to protect the tweeter from any DC).

The input connectors are BNC connectors, just because I could reuse them from an old device which I scrapped at work.

The performance so far is very good, just need to do something about the fans of the SMPS which can be a bit loud after some time.

DSC00161_small.JPG

DSC00159_small.JPG

Aurora power supply.JPG

Hope you all like it!
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Old 11th May 2011, 01:42 PM   #1764
robywan is offline robywan  Australia
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Default TDA1519A based amp

Here is a little 22watt x2 12v chipamp I built for my computer based off the TDA1519A amp, each chip is stereo at 11 watts but by bridging the two inputs and one capacitor at pin 3 you can change it to Bridge mode, quite a nice sound at 22watts powering Tannoy Eclipse speakers from the 70's

Note there is an external 5 amp 12v Switch Mode PSU which is also to a surprise pretty good.

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Old 12th May 2011, 01:47 AM   #1765
CRST is offline CRST  United States
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Attached is a photo of my almost completed chip amp. Some notes:

- LM3886 based Chip Amp from DIY Chip Amplifier Kits, PCB's, Components and Information..
- 22+22V 220 VA toroid transformer
- Two other power sources - 5 V for the controller and wireless remote control, and 12-12v for preamp, cd, etc.
- XBee for the wireless remote control (top left)
- AR1000 FM receiver (tiny almost invisible chip in the top left under XBEE)
- Preamp board, using MC14052 for input selection, and PGA 2310 for volume control.
- Computer CDROM, with external SPDIF / DAC. The audio out of the CDROM wasn't so good - well, pretty bad actually.
- PIC 18F4423 as the system control. Most of the pins are required for the ATAPI interface to the CDROM. Coding up the ATA/ATAPI interface was no trivial task. It took months.

On the far left, is the remote control. I carved this out of a piece of wood. Made the buttons. It uses a PIC 16F688, an XBee transmitter. Runs on 2 x AAA batteries.

I didn't intend this to be the best performance system, but it does pretty good.

Richard
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Old 12th May 2011, 02:46 AM   #1766
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This is the next project
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Old 12th May 2011, 01:14 PM   #1767
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good job, richard! xbees are cool, aren't they? (I just started my own xbee based project, in fact).
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Old 12th May 2011, 06:14 PM   #1768
CRST is offline CRST  United States
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Thanks. It's taken 2 years, although I had to take 1 years off in the middle for other things.

I'd originally developed an IR interface using the Phillips RC5 protocol. However, open electronics shelves don't go with our home decor, and IR repeaters don't work so well. So I switched over to XBee. It's a lot easier to use - it takes care of the communications protocol for you. Much more expensive though.
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Old 12th May 2011, 07:32 PM   #1769
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having both an IR and an RF solution is always nice. my project was all IR until about a week ago. the xbees split the device into client/server and you split your code that way, too, right when it 'writes' to the volume control engine or i/o selector engine. $30 each radio side, though, and that's kind of expensive.
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Old 12th May 2011, 08:37 PM   #1770
CRST is offline CRST  United States
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Re client / server. I'm embarrassed to say that I don't remember. Probably. I'll have to go look at the code this evening.

I must say that the PIC firmware was by far the most difficult part of the project.

I still have a couple of FW defects to fix, then I'm good to go!

Richard
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