Search found 53 matches

by Hannu
Wed 2019-04-17 9:12
Forum: Stand-Alone Applications
Topic: VS1003 with PCB mono speakers and external speakers via 3.5mm jack
Replies: 10
Views: 101

Re: VS1003 with PCB mono speakers and external speakers via 3.5mm jack

TVSes and zeners are there to provide long life for IC by protecting them from ESD zap as you mentioned. Dropping them from your design may cost you the IC and that way make the device totally useless as an audio device. What comes to signal integrity they can have measurable effect with good audio ...
by Hannu
Tue 2019-04-16 11:34
Forum: Stand-Alone Applications
Topic: VS1003 with PCB mono speakers and external speakers via 3.5mm jack
Replies: 10
Views: 101

Re: VS1003 with PCB mono speakers and external speakers via 3.5mm jack

I don't notice any particular problem anymore. I would go to layout design and prototyping.
by Hannu
Wed 2019-04-10 10:19
Forum: Stand-Alone Applications
Topic: VS1003 with PCB mono speakers and external speakers via 3.5mm jack
Replies: 10
Views: 101

Re: VS1003 with PCB mono speakers and external speakers via 3.5mm jack

First a few things to clarify: 1. Yes, as stated in my initial post, I’ve gone through http://www.vsdsp-forum.com/phpbb/viewtopic.php?f=9&t=69 in great detail. As described earlier, my case requires that I connect the “line out” through the 3.5mm jack and hence my post. I can’t just follow the refe...
by Hannu
Thu 2019-04-04 14:19
Forum: Stand-Alone Applications
Topic: VS1003 with PCB mono speakers and external speakers via 3.5mm jack
Replies: 10
Views: 101

Re: VS1003 with PCB mono speakers and external speakers via 3.5mm jack

Hello! The TPA20391 has an enable pin. With GND switching contact jack, you can connect the other end with pull-up resistor to EN pin of the amplifier. When the detect pin closes, it grounds the EN pin and audio comes out from the jack. If the plug detect pin opens the connection, use transistor to ...
by Hannu
Wed 2019-04-03 8:51
Forum: VS1005 and VSOS Software
Topic: VS1005 RTC Frequency tolerance
Replies: 9
Views: 141

Re: VS1005 RTC Frequency tolerance

Hello Panu, A new, related question. We need to consider a more accurate RTC clock. I'm wondering if it is possible to switch between two hardware 32.768kHz clocks (one is low accuracy, low power; other is high accuracy, high power) depending on whether the product is turned Off and running from li...
by Hannu
Fri 2019-03-22 8:50
Forum: VS23S010 Forum
Topic: A few VS23S040 questions
Replies: 9
Views: 184

Re: A few VS23S040 questions

The PLLs are identical. If you change the VS23S010 to VS23S040 you'll get exactly same output from video0. video1,2,3 will also be outputting some signal but the memory contents controlling the signal would be uninitialized as the memory is four times bigger. To get the same output signal from all f...
by Hannu
Wed 2019-03-06 13:54
Forum: VS23S010 Forum
Topic: 8 bit parallel mode
Replies: 5
Views: 127

Re: 8 bit parallel mode

Yes. 8-bit parallel interface can access only memory. With SPI you can access memory and all the registers of the VS23S0x0 ICs.
by Hannu
Mon 2019-02-11 8:14
Forum: VS23S010 Forum
Topic: VS23S010 and VGA monitor
Replies: 13
Views: 3225

Re: VS23S010 and VGA monitor

Shows the HSYNC pulse width (3.15usec) and pulse period of 31.8usec (whole line length OK). This calculates to ~175 pulses (Not OK). I would expect either 480 HYNS pulses or 525. If 480 is correct the VSYNC should be outside the HYNC pulse train. My guess is, that the protolines are OK but the pict...
by Hannu
Mon 2019-01-07 8:06
Forum: VS1005 and VSOS Software
Topic: How to make config.txt
Replies: 4
Views: 176

Re: How to make config.txt

For audio drivers AUxxxxx: http://www.vlsi.fi/fileadmin/software/VS1005/VSOS_Audio.pdf For VSOS: http://www.vlsi.fi/fileadmin/software/VS1005/VSOS_Shell.pdf VOSOS_root and source code package (newest kernel thread on this forum) has root directory which has good starting point for config.txt k9f4g i...
by Hannu
Mon 2018-12-10 10:36
Forum: VS1005 and VSOS Software
Topic: Help! How to record on an SD card with vs1005?!
Replies: 2
Views: 190

Re: Help! How to record on an SD card with vs1005?!

Hello! You might want to check out the SimpleMp3Encoder solution from root_and_sources package. Which does quite many requirements. For the low pass filter VSIDE_DSP_lib provides tools for designing filters. The individual building blocks are documented in audio and shell documentation. You can find...