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Old 28th November 2013, 11:12 AM   #3291
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by jasonp4113 View Post
they weren't exactly square.
Bit strange, as one would expect Conrad to linish three sides.
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Old 28th November 2013, 08:17 PM   #3292
mhouston is offline mhouston  Australia
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Jasonp: looks serious.
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Old 29th November 2013, 12:59 AM   #3293
jasonp4113 is offline jasonp4113  Australia
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Quote:
Originally Posted by jacco vermeulen View Post
Bit strange, as one would expect Conrad to linish three sides.
What I meant was that to bolt the heatsinks to the front panel, they weren't 100% square on the ends, so when you flip another heatsink around to bolt to the other side, you end up with twice the error, so I had to machine the ends so it squared up when both were bolted to the front panel.
Conrad machines the face flat for the components, the remainder is how it comes out of the die.

They are good heatsinks although I would have liked them bigger for even more class-A!!
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Old 14th December 2013, 07:50 PM   #3294
RCBandwidth is offline RCBandwidth  United States
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Default Arduino controlled Pre-Amp and Amplifier

Here's a few pics of what I have been up to for the last few months (Pre-amp and Power Amp).

Each unit has it's own Arduino Uno board.These micros are dirt cheap and in my opinion you would be hard pressed to find a cheaper alternative for DIY electronic projects.

A few details:
The pre-amp is based on a TI stereo volume control chip (PGA2320),it utilizes
a 3.2 inch resistive touch display from 4D Systems,this company has provided
a lot of free development tools to facilitate working with their displays.Input source selection uses an Analog Devices SSM2404 analog switch,2 line level sources can be switched in.Both chips are controlled by the Uno board,you can use the touch screen to set the volume or use the knob.

The Pre-amp/Amp also have capacitive touch capability from the front panel,The brass rods connect to a 12 channel capacitive sense controller from Sparkfun(MPR121),I realize this is redundant but I wanted the ability to develop with both methods from one box. I am treating both units as development tools for future projects.

The Sure 250 watt Class D amp has really exceeded my expectations, (aside from the PWM frequency adjustment issue).The Amp runs very cool even at High listening levels.I added a temperature sensor(LM35) to the Amp to monitor the heat sink temperature,this info is displayed on the screen.Since this unit is micro controlled I could easily add code to activate a cooling fan if desired.

I designed both the boxes in the "Arts and Crafts" style,I wanted to achieve a sense of depth from any viewing angle so I offset most of the joinery.

The very rare 3 string acoustic guitars were an afterthought...BTW I used genuine Martin guitar strings!

Here is a link to more photos:
robertcottiers's Album: Arduino Audio Projects


Bob C.
Attached Images
File Type: jpg sureamp 227.jpg (259.4 KB, 1371 views)
File Type: jpg sureamp 221.jpg (238.4 KB, 1309 views)
File Type: jpg sureamp 237.jpg (203.0 KB, 1264 views)
File Type: jpg IMAG0184.jpg (204.9 KB, 1200 views)
File Type: jpg IMG_0983.JPG (238.8 KB, 1174 views)
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Old 15th December 2013, 12:00 AM   #3295
Bonsai is offline Bonsai  Europe
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Wow - very differrnt and very cool. 250 W per channel means you can pack one helluva punch. I also used the PGA2320 - very nice chip IMV.
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Old 15th December 2013, 06:13 PM   #3296
RCBandwidth is offline RCBandwidth  United States
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Hi Bonsai: I have used the PGA2320 and other variations of it in a few other projects,It really is a great device as you already know.Thanks for your comments!

I am going to check your website link as soon as I shovel a foot of snow from my driveway!

Regards Bob
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Old 15th December 2013, 09:15 PM   #3297
mhouston is offline mhouston  Australia
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RCBandwidth: a real twist to a standard build.
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Old 15th December 2013, 10:32 PM   #3298
RCBandwidth is offline RCBandwidth  United States
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Hello Mark: I took a look at your tube amps I really like the "Arabella"....That Acacia base is just stunning!....Your other projects are top notch also.

I used a 4D systems Display(Australian based) in both units.Great support along with Cutting edge Software support.

Best Regards
Bob C.
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Old 16th December 2013, 01:03 AM   #3299
mhouston is offline mhouston  Australia
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Quote:
Originally Posted by RCBandwidth View Post
Hello Mark: I took a look at your tube amps I really like the "Arabella"....That Acacia base is just stunning!....Your other projects are top notch also.

I used a 4D systems Display(Australian based) in both units.Great support along with Cutting edge Software support.

Best Regards
Bob C.
Thanks for taking the time to look at my blog and for the nice comments. I'm about to start a 6V6 amp using some very old Australian made 6V6s, 80 rec. tube and 6SN7. I'm glad an Ozzie company 4D is making a mark.
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Old 16th December 2013, 06:17 AM   #3300
OnAudio is offline OnAudio
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Hi Bob C.

Thanks for sharing. Great ideas and also contrast. Just like wood in the latest Mercedes Benz .

kind regards,

Harrison.
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