... and it's quiet because the new TPS is producing 0.7 volts.
sigh. I'll just wait for the LT parts to come in.
sigh. I'll just wait for the LT parts to come in.
How odd.
I once designed the TPS70950 into a product. I built the prototype... and it didn't work. I tried another reg... nada. It drew about 10mA and that was it, so I replaced it with an Exar part and all was well.
I should have followed it up but never did, I assume the TPS part I used is of a similar family to yours. Odd indeed.
I once designed the TPS70950 into a product. I built the prototype... and it didn't work. I tried another reg... nada. It drew about 10mA and that was it, so I replaced it with an Exar part and all was well.
I should have followed it up but never did, I assume the TPS part I used is of a similar family to yours. Odd indeed.
Last edited:
I'm assuming the text on the chip reads TPS70950? The TPS70950 product page is offline, another one (TPS70950-Q1) is offered. Maybe they are discontinued and new versions have different needs?
Mystery solved. The TPS70933 is just noisy as all ****. Found an ADP150 and stuffed it on there. Problem solved.
At this point I'm happy with the design. Time to bang out the production one.
At this point I'm happy with the design. Time to bang out the production one.
Took some years to get to this point but quality costs time 🙂 How are things going on the bluetooth module?
PCB and parts are in, spending my time getting the cAMP itself done first.
Edit: still trying to get hold of codec-enabled RN52's from microchip. The local rep won't answer my e-mail, and Microchip just refers me back to them. Gonna try another canadian rep shortly.
Edit: still trying to get hold of codec-enabled RN52's from microchip. The local rep won't answer my e-mail, and Microchip just refers me back to them. Gonna try another canadian rep shortly.
Last edited:
GMarsh - Did you find an accommodating rep? The RN52CVC-I/RM116 seems available at microchipdirect.com. If they don't ship to Canada I would be happy to order and send them to you gratis.
GMA hasn't answered 2 e-mails from me. Haven't picked up the phone yet...
Reps from various chipmakers/distributors occasionally visit the company I work for, I'll just wait for the next Microchip rep to come through and ask them afterwards. It's a lot harder to ignore me in person 🙂 In the meantime, I've got a few prototypes built, with a vanilla RN52 installed on one. Haven't written any code to bring the board up yet, been busy getting other things taken care of.
cAMP status: Schematic/BOM is finalized, and a sample card is in the mail to Denmark for Canopy to give their approval on. Getting bits together now to build a production test jig.
Reps from various chipmakers/distributors occasionally visit the company I work for, I'll just wait for the next Microchip rep to come through and ask them afterwards. It's a lot harder to ignore me in person 🙂 In the meantime, I've got a few prototypes built, with a vanilla RN52 installed on one. Haven't written any code to bring the board up yet, been busy getting other things taken care of.
cAMP status: Schematic/BOM is finalized, and a sample card is in the mail to Denmark for Canopy to give their approval on. Getting bits together now to build a production test jig.
Hope so. PCB/BOM/software are all finished, got a package ready to go to the board house for quote. Other than PCBs themselves there's no long lead items, and it's not an overly complicated design that'll require a long time to program the part shooter or anything. Just bought a crappy Aspire One netbook to use for the test jig, will load it up with AVR programming tools and a few tunes for testing.
Full assembly can potentially happen in less than a month.
Full assembly can potentially happen in less than a month.
Any news here? It has been quiet for a while now 🙂
Would be fantastic if this is done before summer!
Would be fantastic if this is done before summer!
Almost there. Viktor at Canopy is happy with the most recent prototype, and I was up late last night doing the last DFM changes last night - adding fiducals and changing copper to reduce AOI false positives. Resubmitting new design files to the board house tonight.
The 'wiener' card took priority there for a little while (I've got $4K of other people's money, I'm obligated to get that project done ASAP) but I'm waiting for the digikey order to come in for that project at this exact moment. But that's not all bad 🙂 some of the experimentation/calculation behind the wiener card lead to some changes on this card.
I've tweaked the output filter for the GW-1058/HP-10W loading, and I'm going to recommend for installing snubbers across the Boominator woofers - the piezo tweeters don't provide much 'snubbing' action unfortunately. Values are:
HP-10W: 7.5 ohm + 10uF film, installed across each woofer
GW-1058: 6.8 ohm + 4.7uF film, installed across each woofer
If you're using different speakers, or magnetic tweeters with a crossover, this will be different and you'll have to calculate something suitable for your application. Main thing is to make sure that the load impedance is "sensible" (<10 ohms) at HF.
The 'wiener' card took priority there for a little while (I've got $4K of other people's money, I'm obligated to get that project done ASAP) but I'm waiting for the digikey order to come in for that project at this exact moment. But that's not all bad 🙂 some of the experimentation/calculation behind the wiener card lead to some changes on this card.
I've tweaked the output filter for the GW-1058/HP-10W loading, and I'm going to recommend for installing snubbers across the Boominator woofers - the piezo tweeters don't provide much 'snubbing' action unfortunately. Values are:
HP-10W: 7.5 ohm + 10uF film, installed across each woofer
GW-1058: 6.8 ohm + 4.7uF film, installed across each woofer
If you're using different speakers, or magnetic tweeters with a crossover, this will be different and you'll have to calculate something suitable for your application. Main thing is to make sure that the load impedance is "sensible" (<10 ohms) at HF.
When writing up the instructions it might be worth including an explicit recommendation for the other common build configuration with the P.Audio PHT-407N tweeters.
Hmm... if anyone has access to a PHT-407N and appropriate measuring tools, I'd like to know the Re/Le values. Maybe I'll bang out a passive crossover design.
Current state: All design files are with the local board house, they're quoting parts/PCBs/etc to do the build and should have a quote within a couple days for us. With that in hand, Canopy will be able to set a price for the thing, and start taking orders!
Current state: All design files are with the local board house, they're quoting parts/PCBs/etc to do the build and should have a quote within a couple days for us. With that in hand, Canopy will be able to set a price for the thing, and start taking orders!
I'm a little confused about the crossovers, as I thought the board had DSP for active crossovers to suit all the different configurations.
That's punted to a future product 🙂
Rev 1 card (which I built for my own boominator, which I since sold) had 4 channels with a DSP and a huge process required to change DSP coefficients.
Rev 2 card = 2 channels, this was more of an experiment to make a 50W/ch amplifier with dynamic DC/DC. Dynamic bits didn't work but I proofed the DC/DC design at least. Solar charger left off, 5V DC/DC left off...
Rev 3 card = Complicated beast with 2 channels and a DSP doing active highpass and controlling the DC/DC. It works, but really needs a lot of refinement to make a "customer ready" product and was taking too long to finish.
Rev 4 card = Current "lets put a card on the market that does a simple job and does it well" design.
This is the Rev4 card:
This is the features:
- 20W MPPT solar charger using LT3652
- DC/DC for 5V USB output (2A) along with a USB charge controller chip so it'll happily charge ipods/ipads/whatever.
- TPA3118D2 amplifier w/fixed highpass frequency.
- Microcontroller handling low battery shutdown and general board mount duties.
The production card is almost identical to this card, with a few minor changes.
I do have plans in the future of dusting off the DSP/DC-DC/etc and integrating them into a board for sale. But this is a spare time project, I don't exactly design these cards for a living and I might only have an hour or so to throw at the design every few nights.
OK, thanks for clearing that up. A shame about the DSP, but hopefully that means a considerably lower price.