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by mkelly99
Tue Oct 03, 2017 3:04 pm
Forum: HATs and other add-ons
Topic: Unique Raspberry Pi Hybrid Tube Amplifier Add On
Replies: 0
Views: 1454

Unique Raspberry Pi Hybrid Tube Amplifier Add On

The 502HTA is a complete redesign of the highly popular 503HTA. We have increased the size to standard shield size and significantly reduced the noise floor. We have also added the ability to power the PI from it's own supply to eliminate any noise coupling from the Pi. Main features are: FORM FACTO...
by mkelly99
Sat May 21, 2016 1:16 pm
Forum: HATs and other add-ons
Topic: Phat's for Pi Zero
Replies: 19
Views: 6295

Re: Phat's for Pi Zero

Pi 2 Design (my company) did a Pi Zero DAC hat (and we also have an SSD hat w/wifi) with both analog line out and digital SPDIF. We've tested with Volumio and OSMC. We use the same DAC, PCM5102A as Pimoroni, and had no issues running it. IIRC we did not have to modify the stock Volumio. Cheers, Mich...
by mkelly99
Sat May 21, 2016 1:10 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4164

Re: PI2MEDIA DAC HAT with Hybrid Tube Amp

We've made a number of enhancements including the ability to drive the Hat from an external analog source, both with and without the Pi!

Also added volume control and upgraded the audio caps to Nichicon FG and KZ Muse family.

Cheers,
Michael
by mkelly99
Fri May 06, 2016 1:40 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4164

Re: PI2MEDIA DAC HAT with Hybrid Tube Amp

New photos of the Rev 2 version just built! https://ksr-ugc.imgix.net/assets/011/112/429/5f6ba7884c0193a6e2ad4d3cfed80344_original.jpg?w=680&fit=max&v=1462491247&auto=format&q=92&s=7c33c1ef4099592f1f4d5570e9d12d3f Also shown on the Kickstarter page: https://www.kickstarter.com/projects/1815752970/hy...
by mkelly99
Thu Apr 28, 2016 11:44 am
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Re: Compute Module 3 Cluster

Update - The blank PCB's for the carrier and the blades have arrived. It will take a few weeks to gather up the parts to build a couple of carriers and 20 or so blades. Then of course, we need to wait on the Compute Module 3. Hopefully when they come out they won't become hard to get. If anyone at t...
by mkelly99
Thu Apr 28, 2016 10:34 am
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4164

Re: PI2MEDIA DAC HAT with Hybrid Tube Amp

Quick update - We just received the second revision PCB's and will be building them early next week. If you want to get on the mailing list you can do that at http://www.pi2design.com. We will be offering the units at the $99 on Kickstarter, but limited to the first 100. Those on the mailing list wi...
by mkelly99
Sat Apr 23, 2016 12:59 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4164

Re: PI2MEDIA DAC HAT with Hybrid Tube Amp

Update - We just finished testing with the 6922/6DJ8 tube from JJ electronics. Very good results, at low voltage output of<=2Vrms (6V pk-pk) it has lower distortion than the 12AU7, but this requires a higher plate bias voltage (16V versus 12.5V). This limits the headroom for higher impedance headpho...
by mkelly99
Fri Apr 22, 2016 3:46 pm
Forum: Graphics, sound and multimedia
Topic: Using Raspberry PI as DLNA receiver + TV audio amplifier
Replies: 3
Views: 2118

Re: Using Raspberry PI as DLNA receiver + TV audio amplifier

Thanks for the referral mobileHman! Yes, our 502V2S takes in the HDMI output of the Pi and brings out the 7.1 audio stream. It send the HDMI back out so you can still send that to the TV. No data is lost. The 7.1 audio stream is sent to four PCM5122 Stereo DAC's and is accessed via four 3.5mm audio ...
by mkelly99
Wed Apr 20, 2016 7:49 pm
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Re: Compute Module 3 Cluster

Thanks Martin! Price is still TBD, but we expect the carrier to be under $300 (with a CM1 or CM3) and the blade boards under $70 (w/o CM3). Add in the cost of the CM, but without an SSD yields around $1.4K assuming the CM 3 is still under $40. That's ~$1.4K for forty 1.2Ghz 64-Bit ARM Cortex-A53 cor...
by mkelly99
Wed Apr 20, 2016 12:44 am
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4164

Re: PI2MEDIA DAC HAT with Hybrid Tube Amp

asandford wrote:The mods frown upon multiple postings about the same subject.
Yes, that was an error. I posted in the other topic by mistake. How do I purge the other one?
by mkelly99
Tue Apr 19, 2016 8:24 pm
Forum: HATs and other add-ons
Topic: Raspiberry Pi 2 - Cellular Board
Replies: 1
Views: 572

Re: Raspiberry Pi 2 - Cellular Board

We have a Pi HAT that has a USB hub built in that connects to a Wifi Module, Bluetooth and a Mini-PCIe socket for a USB cell modem (includes a SIM socket). This is our 503U3G. It is due to be released early next month. We have protos now. If you send an email to [email protected].com so we can send yo...
by mkelly99
Tue Apr 19, 2016 8:20 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube AMP
Replies: 2
Views: 1267

Re: PI2MEDIA DAC HAT with Hybrid Tube AMP

The HAT size forced the use of small SMT components, plus the DAC itself is fine pitch. The only option I could think of is to leave all the through hole off, but we worry about the level of quality required even for that. It would likely have to be offered without warranty. I wonder if that would b...
by mkelly99
Tue Apr 19, 2016 8:17 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube Amp
Replies: 9
Views: 4164

PI2MEDIA DAC HAT with Hybrid Tube Amp

Hello all. We just finished testing the prototypes for a small Hat size add-on. It connects to the PI I2S port. A PCM5102A DAC drives single 12AU7 tube gain stage with solid state Class-A output. It is designed to drive headphones from 32 to 300 ohm quite easily. The design is derived from the popul...
by mkelly99
Tue Apr 19, 2016 7:38 pm
Forum: HATs and other add-ons
Topic: PI2MEDIA DAC HAT with Hybrid Tube AMP
Replies: 2
Views: 1267

PI2MEDIA DAC HAT with Hybrid Tube AMP

See this post in add-ons. Sorry for the confusion
by mkelly99
Tue Apr 19, 2016 1:30 pm
Forum: General discussion
Topic: PiZero Roadmap
Replies: 159
Views: 67134

Re: PiZero Roadmap

A quick update. Raspberry PI Zero production is restarting in Wales next Monday after a hiatus to allow us to focus on Raspberry Pi 3 (a million units built and counting :D). We have placed 250ku of new orders, and are aiming to produce at least 50ku/month for the rest of this year. Distribution wi...
by mkelly99
Tue Apr 19, 2016 11:36 am
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Re: Compute Module 3 Cluster

As mentioned earlier, we have a block diagram of the 501M10 carrier and the 501CMX blade. The link is http://www.pi2design.com/uploads/4/8/5/3/48531975/visio-501m10_block.pdf . The 3D PDF for the 501M10 is here: http://www.pi2design.com/uploads/4/8/5/3/48531975/501m10_3d_p1.pdf (warning 21MB!) and t...
by mkelly99
Tue Apr 19, 2016 11:32 am
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Re: Compute Module 3 Cluster

Yes, we saw your announcement awhile ago. We had looked at doing something similar, since we already had the Compute Module design, plus we have designed some Pi-Zero Hats ( http://www.pi2design.com/store/p10/504DAC1_-_Digital-to-Analog_Converter_for_the_Raspberry_Pi_Zero.html and http://www.pi2desi...
by mkelly99
Mon Apr 18, 2016 3:25 pm
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Re: Compute Module 3 Cluster

To the right of the CM is an M.2 SSD socket. we are showing an example of an M.2 SSD Module loaded into the socket. This was done to give each CM it's own local storage.

Michael
by mkelly99
Sat Apr 16, 2016 10:05 pm
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Re: Compute Module 3 Cluster

The BMC interfaces to each CM over USB for programming. It uses GPIO to control power and reset. It also takes the CM UART and allows remote console access. The BMC programs the GIGe switches and has a 10/100 link into one of them. The BMC has a USB host port and HDMI for local use. As for running G...
by mkelly99
Fri Apr 15, 2016 10:22 am
Forum: Compute Module
Topic: Compute Module 3 Cluster
Replies: 19
Views: 20616

Compute Module 3 Cluster

I developed a multiple CM cluster a few months back, but held off fabbing. Once I saw the reference to the CM3 in the Pi 3 announcement I went ahead and sent it to the fab house. Should be back in a few weeks. I am looking to get some CM3's as soon as possible, but we'll debug using CM1. Note that w...
by mkelly99
Wed Apr 13, 2016 8:53 pm
Forum: Compute Module
Topic: CM3
Replies: 90
Views: 22638

Re: CM3

I developed a multiple CM cluster a few months back, but held off fabbing. Once I saw the reference to the CM3 in the Pi 3 announcement I went ahead and sent it to the fab house. Should be back in a few weeks. I am looking to get some CM3's as soon s possible, but we'll debug using CM1. Note that we...
by mkelly99
Wed Apr 06, 2016 6:06 pm
Forum: Compute Module
Topic: Raspberry Pi Compute Module or RASPICOM 3D model
Replies: 22
Views: 9001

Re: Raspberry Pi Compute Module or RASPICOM 3D model

Is there more info on the MiniCluster with 8 Compute Module nodes?

Michael

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