- User contributions [en]

Projects

2023-08-17T00:44:50Z

Admin wiki:

Following the list of open projects. Some of them are already planned or running since many years. But one day, they all will be finished.

Most of the projects are either related to music, has some kind of a display, implements a clock or a combination of these.

== Running Projects ==
; [[Project_Mary|Mary]]: USB-Audio interface with bluetooth connectivity
; [[Project_Natacha|Natacha]]: Standalone music player

== Planned Projects ==
; Mono-Amp: Two mono-block audio power amplifier
; Pre-Amp: Modular audio pre-amplifier
; PS/2 Interface: Experimenting with PS/2 keyboard
; 7-Segment: 7 segment display, controlled only by hardware

== Project Ideas ==

Project Natacha

2023-08-17T00:36:41Z

Admin wiki:

Standalone Music Player based on an Banana Pi M2 Berry and a STM32F469Discoveryboard.

== Hardware ==
Most of the used hardware were planed since a long time for this kind of a project or it was just laying around.

=== BananaPi M2 Berry ===
The BananaPi (BPI) M2 Berry is a replacement board for the Raspberry Pi 3. Compared to the Raspberry Pi, the BPI has an onboard connector for SATA. So, a SSD could be directly connected to the BPI, which makes it perfect for small servers. This BPI was originally ordered to realize a small cloud server, but due the performance was never as expected, it was never finished or used for something other.
with the SATA interface and the onboard sound, it would be perfect for this project, and the BPI gets a next chance. A Kensigton SSD was also laying around and with 250 GB it matches perfectly for this project.
The BPI would take responsible for playing the music stored on the SSD. It also prepares the track information for the display and brings the cover image to the needed size and format.

=== USB Audio Device ===
The sound of the onboard audio codec of the BPI was not as expected. Either, there was something wrong in the configuration or it has a defect. The low frequencies were not present at all. After a short search in the box for defect electronics, an old headset from Microsoft was found. It was used a long time under Linux until the microphone was broken. Short test, sounds as good as possible with the cheap headphone.
The headset has a small box in the middle of the cable for converting from USB to the headphone and some buttons for volume control. The box could be easily opened and the cable to the headphone was replaced by the cable to the headphone connector in the front.

=== STM32F469Discovery ===
The STM32F469Discovery board has already a lot of periphery onboard. Besides the TFT display with touch sensor, an audio codec including microphone, some buttons and LEDs, as well a lot of connections for further electronics is available. The board would act as the user interface. Therefore, the display is the most imported thing. The size of the display and the whole board fits perfectly in a 2HE or 88 mm height housing.
The STM32 would act as the user interface and controls the BPI.

=== Power Supply ===
First, a standard charging adapter with an USB-Micro cable was used. After some seconds of booting, the BPI restarts without any error messages. A different charger did also not help, too less current could not be the problem. Maybe wrong image on the SD-card. An old image was found, which already was running on this board. But the BPI still restarts even with this image. The last idea was to change the USB cable. And, tadaa! It boots up without any problems. Also with the current image.
To get rid of this weak USB cables, an old power supply from a router is reused. The DC-barrel connector is removed and the cable is soldered to the expansion port of the BPI. Since then, the BPI works without any problems. And if there were troubles, they were not related to the power supply.

=== Housing ===
The housing was originally planned for the audio [[Mono_Amp|mono block power amplifier]] 20 years ago. Later, a pre-amplifier in the same look should be build. Unfortunately, the housing was no longer manufactured and there is only a pair of these housings, they can no longer be used.

One of these housings is now used for this project. The housing was originally out of a series of 19 inch rack housings. They were available in different heights and also in half width. This housing is one of the half width and 2HE or 88mm height. With a depth of 22cm, it has a perfect form factor for this kind of projects.

== Software ==
=== Linux for the BPI ===
The latest image for the BPI is an Ubuntu 16. So, the first days was used to bring the image to a current version. After a lot of "do-release-update" and problems with some packages, the image was on the latest version. Next step: backup the image!

=== Media Player ===
As media player, the mpv is used. It is a fork of the mplayer and has some extensions against the mplayer.

Projects

2023-08-17T00:22:17Z

Admin wiki:

Following the list of open projects. Some of them are already planned or running since many years. But one day, they all will be finished.

== Running Projects ==
; [[Project_Mary|Mary]]: USB-Audio interface with bluetooth connectivity
; [[Project_Natacha|Natacha]]: Standalone music player

== Planned Projects ==
; Mono-Amp: Two mono-block audio power amplifier
; Pre-Amp: Modular audio pre-amplifier
; PS/2 Interface: Experimenting with PS/2 keyboard
; 7-Segment: 7 segment display, controlled only by hardware

== Project Ideas ==

Main Page

2023-08-17T00:20:18Z

Admin wiki:

<strong>Welcome to the wiki pages of vvbv.ch</strong>

Here you can find some technical details about the [[Projects]] of vvbv.ch, microcontroller and programming, [[Linux]] and [[Tools]], and other funny stuff.

Projects

2023-08-16T19:41:33Z

Admin wiki:

Following my list of open projects. Some of them are already planned or running since many years. But one day, I will finish them all.

== Running Projects ==
; [[Project_Mary|Mary]]: USB-Audio interface with bluetooth connectivity
; [[Project_Natacha|Natacha]]: Standalone music player

== Planned Projects ==
; Mono-Amp: Two mono-block audio power amplifier
; Pre-Amp: Modular audio pre-amplifier
; PS/2 Interface: Experimenting with PS/2 keyboard
; 7-Segment: 7 segment display, controlled only by hardware

== Project Ideas ==

Project Mary

2023-08-16T19:40:35Z

Admin wiki: Created page with "USB-Audio device with bluetooth connectivity. == Hardware == === Controller === === USB-Audio Interface === === Bluethooth Interface === === Audio Codec === === Housing..."

USB-Audio device with bluetooth connectivity.

== Hardware ==

=== Controller ===

=== USB-Audio Interface ===

=== Bluethooth Interface ===

=== Audio Codec ===

=== Housing ===
The housing is taken from a no longer used wireless microphone from Shure. It has half the width of a 19 inch rack housing and 1 HE or 44 mm height. The front and back could not be reused and were replaced by wooden plates. The back is build out of a 2mm plywood and the front is a 10 mm hard wood.

== Software ==

Project Natacha

2023-08-16T19:25:48Z

Admin wiki:

Standalone Music Player based on an Banana Pi M2 Berry and a STM32F469Discoveryboard.

== Hardware ==
Most of the used hardware were planed since a long time for this kind of a project or it was just laying around.

=== BananaPi M2 Berry ===
The BananaPi (BPI) M2 Berry is a replacement board for the Raspberry Pi 3. Compared to the Raspberry Pi, the BPI has an onboard connector for SATA. So, a SSD could be directly connected to the BPI, which makes it perfect for small servers. This BPI was originally ordered to realize a small cloud server, but due the performance was never as expected, it was never finished or used for something other.
with the SATA interface and the onboard sound, it would be perfect for this project, and the BPI gets a next chance. A Kensigton SSD was also laying around and with 250 GB it matches perfectly for this project.
The BPI would take responsible for playing the music stored on the SSD. It also prepares the track information for the display and brings the cover image to the needed size and format.

=== USB Audio Device ===
The sound of the onboard audio codec of the BPI was not as expected. Either, there was something wrong in the configuration or it has a defect. The low frequencies were not present at all. After a short search in the box for defect electronics, an old headset from Microsoft was found. It was used a long time under Linux until the microphone was broken. Short test, sounds as good as possible with the cheap headphone.
The headset has a small box in the middle of the cable for converting from USB to the headphone and some buttons for volume control. The box could be easily opened and the cable to the headphone was replaced by the cable to the headphone connector in the front.

=== STM32F469Discovery ===
The STM32F469Discovery board has already a lot of periphery onboard. Besides the TFT display with touch sensor, an audio codec including microphone, some buttons and LEDs, as well a lot of connections for further electronics is available. The board would act as the user interface. Therefore, the display is the most imported thing. The size of the display and the whole board fits perfectly in a 2HE or 88 mm height housing.
The STM32 would act as the user interface and controls the BPI.

=== Power Supply ===
First, a standard charging adapter with an USB-Micro cable was used. After some seconds of booting, the BPI restarts without any error messages. A different charger did also not help, too less current could not be the problem. Maybe wrong image on the SD-card. An old image was found, which already was running on this board. But the BPI still restarts even with this image. The last idea was to change the USB cable. And, tadaa! It boots up without any problems. Also with the current image.
To get rid of this weak USB cables, an old power supply from a router is reused. The DC-barrel connector is removed and the cable is soldered to the expansion port of the BPI. Since then, the BPI works without any problems. And if there were troubles, they were not related to the power supply.

=== Housing ===
The housing was originally planned for the mono audio amplifier 20 years ago. A pre-amplifier was also planed to build some years later in the same housing. But meanwhile, this housing is no longer manufactured. One of these housings is now used for this project. The housing was originally out of a series of 19 inch rack housings. They were available in different heights and also in half width. This housing is one of the half width and 2HE or 88mm height. With a depth of 22cm, it has a perfect form factor for this kind of projects.

== Software ==
=== Linux for the BPI ===
The latest image for the BPI is an Ubuntu 16. So, the first days was used to bring the image to a current version. After a lot of "do-release-update" and problems with some packages, the image was on the latest version. Next step: backup the image!

=== Media Player ===
As media player, the mpv is used. It is a fork of the mplayer and has some extensions against the mplayer.

Projects

2023-08-16T19:07:18Z

Admin wiki:

Following my list of open projects. Some of them are already planned or running since many years. But one day, I will finish them all.

== Running Projects ==
; Mary: USB-Audio interface
; [[Project_Natacha|Natacha]]: Standalone music player

== Planned Projects ==
; Mono-Amp: Two mono-block audio power amplifier
; Pre-Amp: Modular audio pre-amplifier
; PS/2 Interface: Experimenting with PS/2 keyboard
; 7-Segment: 7 segment display, controlled only by hardware

== Project Ideas ==

Project Natacha

2023-08-16T18:36:05Z

Admin wiki: Created page with "Standalone Music Player based on an Banana Pi M2 Berry and a STM32F469Discoveryboard. == Hardware == Most of the used hardware were planed since a long time for this kind of..."

Standalone Music Player based on an Banana Pi M2 Berry and a STM32F469Discoveryboard.

== Hardware ==
Most of the used hardware were planed since a long time for this kind of a project or it was just laying around.

=== BananaPi M2 Berry ===
The BananaPi (BPI) M2 Berry is a replacement board for the Raspberry Pi 3. Compared to the Raspberry Pi, the BPI has an onboard connector for SATA. So, a SSD could be directly connected to the BPI, which makes it perfect for small servers. This BPI was originally ordered to realize a small cloud server, but due the performance was never as expected, it was never finished or used for something other.
with the SATA interface and the onboard sound, it would be perfect for this project, and the BPI gets a next chance. A Kensigton SSD was also laying around and with 250 GB it matches perfectly for this project.
The BPI would take responsible for playing the music stored on the SSD. It also prepares the track information for the display and brings the cover image to the needed size and format.

=== USB Audio Device ===
The sound of the onboard audio codec of the BPI was not as expected. Either, there was something wrong in the configuration or it has a defect. The low frequencies were not present at all. After a short search in the box for defect electronics, an old headset from Microsoft was found. It was used a long time under Linux until the microphone was broken. Short test, sounds as good as possible with the cheap headphone.
The headset has a small box in the middle of the cable for converting from USB to the headphone and some buttons for volume control. The box could be easily opened and the cable to the headphone was replaced by the cable to the headphone connector in the front.

=== STM32F469Discovery ===
The STM32F469Discovery board has already a lot of periphery onboard. Besides the TFT display with touch sensor, an audio codec including microphone, some buttons and LEDs, as well a lot of connections for further electronics is available. The board would act as the user interface. Therefore, the display is the most imported thing. The size of the display and the whole board fits perfectly in a 2HE or 88 mm height housing.
The STM32 would act as the user interface and controls the BPI.

=== Power Supply ===
First, a standard charging adapter with an USB-Micro cable was used. After some seconds of booting, the BPI restarts without any error messages. A different charger did also not help, too less current could not be the problem. Maybe wrong image on the SD-card. An old image was found, which already was running on this board. But the BPI still restarts even with this image. The last idea was to change the USB cable. And, tadaa! It boots up without any problems. Also with the current image.
To get rid of this weak USB cables, an old power supply from a router is reused. The DC-barrel connector is removed and the cable is soldered to the expansion port of the BPI. Since then, the BPI works without any problems. And if there were troubles, they were not related to the power supply.

=== Housing ===

== Software ==
=== Linux for the BPI ===
The latest image for the BPI is an Ubuntu 16. So, the first days was used to bring the image to a current version. After a lot of "do-release-update" and problems with some packages, the image was on the latest version. Next step: backup the image!

Projects

2023-08-16T17:44:26Z

Admin wiki:

Following my list of open projects. Some of them are already planned or running since many years. But one day, I will finish them all.

== Running Projects ==
; Mary: USB-Audio interface
; Natacha: Standalone music player

== Planned Projects ==
; Mono-Amp: Two mono-block audio power amplifier
; Pre-Amp: Modular audio pre-amplifier
; PS/2 Interface: Experimenting with PS/2 keyboard
; 7-Segment: 7 segment display, controlled only by hardware

== Project Ideas ==

Mono-amp

2023-03-30T20:46:39Z

Admin wiki: Created page with "Back in the earyl 2000's, I started to build my own power amplifier, based on modules from Thel Audio. == Features == ; Dual Mono: Two complete separated blocks. ; Mirrored..."

Back in the earyl 2000's, I started to build my own power amplifier, based on modules from Thel Audio.

== Features ==
; Dual Mono: Two complete separated blocks.
; Mirrored construction: Move both block next to each other and it should look like a symetrical dual channel power amplifier.
; AC input: No external power supply for all of my projects.
; XLR balanced audio input: Alternatives are single ended through XLR or something digital.
; Speakon output for speaker: State of the art, but overkill. Will be changed to normal speaker connectors
; Wooden front:
; No switches on the front: Just a LED to show the current state of the amplifier
; Inrush current protection:
;

== Housing ==
Original I ordered two housings from Monacor. One of them is already modified for the first test and I want to build a matching pre-amplifier. This must be in the same housing. Unfortunately, they are no longer available. After a long research, I found replacement housings at [https://hifi2000.shop/site/en Hifi 2000]. As soon as this project get running again, I will order the housings.

Projects

2023-03-30T19:39:09Z

Admin wiki: Created page with "Following my list of open projects. Some of them are already planned or running since many years. But one day, I will finish them all. == Running Projects == ; Mary: USB-Audi..."

Following my list of open projects. Some of them are already planned or running since many years. But one day, I will finish them all.

== Running Projects ==
; Mary: USB-Audio interface

== Planned Projects ==
; Mono-Amp: Two mono-block audio power amplifier
; Pre-Amp: Modular audio pre-amplifier
; PS/2 Interface: Experimenting with PS/2 keyboard
; 7-Segment: 7 segment display, controlled only by hardware

== Project Ideas ==