heres My DIY amp b500 by APEX audio =)..
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
New Enclosures
Thx for the comments. Inside view. Enclosure only at the moment. Have mill in the garage so can do some milling (I am fitter by trade from another life) Need to finish off venting in the lid and base as well.
Probably put a design based on the blameless/badger in one of these and something else in another (SKA??) so I can truly compare.
Will also integrate a CS4398 DAC, so will end up to be really a "digital only" integrated amp (not interested in analog inputs since everything I own is SPDIF)
I now own a company that designs/manufacturers audio equipment for tourism, but haven't built a decent amp from myself in 20 yrs. Have plenty of experience in PCB design/layout and also with DAC's, but not much recently with true analog design, so learning quite a bit all over again (Thx Cordell and Self)
Have some Tannoy DC8T's and an old-ish Denon AVC-A1SE which is in serious need of an upgrade to match my speakers!!
Jas
Thx for the comments. Inside view. Enclosure only at the moment. Have mill in the garage so can do some milling (I am fitter by trade from another life) Need to finish off venting in the lid and base as well.
Probably put a design based on the blameless/badger in one of these and something else in another (SKA??) so I can truly compare.
Will also integrate a CS4398 DAC, so will end up to be really a "digital only" integrated amp (not interested in analog inputs since everything I own is SPDIF)
I now own a company that designs/manufacturers audio equipment for tourism, but haven't built a decent amp from myself in 20 yrs. Have plenty of experience in PCB design/layout and also with DAC's, but not much recently with true analog design, so learning quite a bit all over again (Thx Cordell and Self)
Have some Tannoy DC8T's and an old-ish Denon AVC-A1SE which is in serious need of an upgrade to match my speakers!!
Jas
Attachments
When I bought plate aluminum cut to size from Capral it all came with bows in it, do you have that issue?
David
PS Nice case buy the way, I had mine powder coated with Interpon Asteroid looks great cost a bit though. I got lucky as the powder coater had just enough left to do my cases otherwise it would have cost a LOT more.
Heatsinks came from Conrad. I had to machine them as they weren't exactly square. They aren't extrusions but instead are high pressure injected aluminium. Plate came from Action Aluminium in Brisvegas and they cut to size which was great as many places won't and instead want you to buy 2.4m x 1.2m sheets! I plan to get the all the silver parts linished and anodized.
The front is also to have a LCD graphic display as I am planning a few neat features for this design using a STM32 processor (ARM cortex M3)
Flat: yes, true: not originally. I asked them how "accurate" they could get it square and they said to within a mm over the size I required - well they had to go and cut a few of the pieces twice since they were off square by 3mm over a 300mm length.
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!!
Member
Joined 2004
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.
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.
Attachments
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.
Member
Joined 2004
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
I am going to check your website link as soon as I shovel a foot of snow from my driveway!
Regards Bob
Member
Joined 2004
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.
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.