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by zipplet
Sun Jun 25, 2017 2:34 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 334
Views: 489587

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

rpdom wrote:You could add some apt-get hooks that do the updating of /boot on the SD card after an upgrade or dist-upgrade.
Good idea - I'll revisit the tool at some point and add support for that - then it becomes completely transparent to the end-user.
by zipplet
Sat Jun 24, 2017 12:53 pm
Forum: Advanced users
Topic: Extra 16M memory on Pi2/Pi3
Replies: 32
Views: 20401

Re: Extra 16M memory on Pi2/Pi3

I have been using this setting with retropie + the latest updates to Raspbian without issue so far at 1024 on a Pi 3B - I'll report back if I manage to get it to crash. Retropie is a good stress test with some of the emulators. One other way to play with this would be to use that project I forget th...
by zipplet
Sat Jun 24, 2017 5:18 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 334
Views: 489587

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

If it is any help, I wrote a tool to automate the task of moving your root partition from an SD card to a USB device and making the necessary changes to the boot configuration files. You still need the SD card present to load the boot files (firmware and kernel), but it will run the OS from the USB ...
by zipplet
Fri Jun 23, 2017 10:43 am
Forum: Graphics, sound and multimedia
Topic: How To Video: Get decent audio from a Pi Zero with PWM
Replies: 2
Views: 2369

Re: How To Video: Get decent audio from a Pi Zero with PWM

In the video you put some emphasis on the fact that the output capacitors should be electrolytics/polarized. More often than not ceramic or tantalum capacitors are used to get rid of the DC part of the signal. At least when used at the input of e.g. a amplifier. Could you please elaborate on this? ...
by zipplet
Mon Jan 02, 2017 12:59 pm
Forum: Advanced users
Topic: Analogue audio testing
Replies: 265
Views: 126748

Re: Analogue audio testing

Quick note to say that jdb's wonderful firmware update is a nice combination with vlc's volume boost and headphones. Yup, sigma-delta mode works really well with the correct setup - even on a pi zero as I demonstrated. I still maintain that it really is a line-out port and not a headphone out port....
by zipplet
Fri Dec 23, 2016 11:45 pm
Forum: Advanced users
Topic: Custom UPS designs - what do you think?
Replies: 8
Views: 1926

Re: Custom UPS designs - what do you think?

use a microntroller I think that is a much better word than micro-controller. Remember, you saw it here first. Thanks, @mosespi. When the serviceman came to fix my mother-in-law's cooker he replaced the 'micom' (micro-computer). That was more than 15 years ago (in Japan). Such abbreviations are com...
by zipplet
Sun Dec 18, 2016 12:01 pm
Forum: Advanced users
Topic: Custom UPS designs - what do you think?
Replies: 8
Views: 1926

Re: Custom UPS designs - what do you think?

http://kicad-pcb.org/ This software is what I use, and in my opinion, it's on par with commercial equivalents (few missing features, but even they're getting there). The simulation is currently being worked on and isn't really meant for day to day use yet. It runs on Linux, Windows and OSX. Sounds ...
by zipplet
Sat Dec 17, 2016 4:53 am
Forum: Advanced users
Topic: Custom UPS designs - what do you think?
Replies: 8
Views: 1926

Custom UPS designs - what do you think?

Hi, So I am playing around with different custom UPS designs for the Pi (hey, not everyone wants to use Li-ion or a HAT, and some people like playing with circuits :mrgreen: ). All of these are designed for NiMH batteries. So far I have one working design, and 2 others on the table and would like to...
by zipplet
Fri Dec 16, 2016 2:05 pm
Forum: Advanced users
Topic: Analogue audio testing
Replies: 265
Views: 126748

Re: Analogue audio testing

Hi Zipplet, After testing with a B+ I reused that device with a regular DAC. However I still have a spare pi zero, and wanted to build a super minimal player from this. Can you share the filter circuit you created to pull the analogue sound out of the GPIO and how you build that ? If it is not to e...
by zipplet
Mon Dec 12, 2016 5:43 am
Forum: Graphics, sound and multimedia
Topic: Question about DAC
Replies: 32
Views: 8823

Re: Question about DAC

Sorry don't understand your question. Please look at the DAC board you got for your Raspberry Pi carefully, and look for any chips on the board. Please write down the part numbers printed on the chips. If you are still unsure, try to get a good quality photo (a flashlight may help illuminate the ma...
by zipplet
Mon Dec 12, 2016 4:55 am
Forum: Advanced users
Topic: Analogue audio testing
Replies: 265
Views: 126748

Re: Analogue audio testing

I must say thanks for adding this setting, even if it is experimental. I have managed to get excellent results with this on a Pi Zero with a filter circuit and dual 3W class D amplifier. :mrgreen:
by zipplet
Mon Dec 12, 2016 4:42 am
Forum: Graphics, sound and multimedia
Topic: Question about DAC
Replies: 32
Views: 8823

Re: Question about DAC

Can you please tell me the markings on the IC on the board? I suspect the chip has a shutdown pin, and this is floating - that would cause your issue. The PAM8403 amplifier IC I use for various applications has a similar problem; it has an internal pullup on the shutdown pin but it is so weak that i...
by zipplet
Sun Dec 11, 2016 4:13 pm
Forum: Graphics, sound and multimedia
Topic: How To Video: Get decent audio from a Pi Zero with PWM
Replies: 2
Views: 2369

How To Video: Get decent audio from a Pi Zero with PWM

Hi, I am new here, but have been playing with various Raspberry Pi models for many years. I decided to join the community to share some tricks and knowledge. I created this video which demonstrates very good sound quality from the PWM output of the Pi Zero and explains how to do this very cheaply yo...

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