Recent Posts

Pages: [1] 2 3 4 5 6 ... 10 Next
1
RF, Microwave, Ham Radio / Re: WSJT-X on Pi
« Last post by metrologist on Today at 11:07:34 pm »
Probably should have done this first

pi@raspberrypi:~ $ sudo apt install libqt5multimedia5
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 libc6-dbg : Depends: libc6 (= 2.19-18+deb8u7) but 2.31-13+rpi1+deb11u8 is to be installed
 libc6-dev : Depends: libnsl-dev but it is not going to be installed
 libcrypt-dev : Breaks: manpages-dev (< 5.01-1) but 3.74-1 is to be installed
 libnih1 : Depends: libc6 (< 2.20) but 2.31-13+rpi1+deb11u8 is to be installed
 libqt5multimedia5 : Depends: libqt5core5a (>= 5.15.2+dfsg~) but 5.3.2+dfsg-4+rpi1 is to be installed
                     Depends: libqt5gui5 (>= 5.15.2+dfsg~) but 5.3.2+dfsg-4+rpi1 is to be installed or
                              libqt5gui5-gles (>= 5.15.2+dfsg~) but it is not going to be installed
                     Depends: libqt5network5 (>= 5.15.2+dfsg~) but 5.3.2+dfsg-4+rpi1 is to be installed
                     Depends: libstdc++6 (>= 5) but 4.9.2-10 is to be installed
                     Depends: qtbase-abi-5-15-2
 manpages : Breaks: manpages-dev (< 5.09-2) but 3.74-1 is to be installed
 openssh-sftp-server : Depends: openssh-client (= 1:6.7p1-5+deb8u3) but 1:8.4p1-5+deb11u3 is to be installed
 wsjtx : Depends: libgfortran5 (>= 8.3) but it is not going to be installed or
                  libgfortran4 (>= 7.3) but it is not going to be installed or
                  libgfortran3 (>= 6.3) but 4.9.2-10 is to be installed
         Depends: libgomp1 (>= 6) but 4.9.2-10 is to be installed
         Depends: libqt5serialport5 (>= 5.7) but it is not going to be installed
         Depends: libqt5multimedia5-plugins (>= 5.7) but it is not going to be installed
         Depends: libqt5widgets5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5network5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5printsupport5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5sql5-sqlite (>= 5.7) but it is not going to be installed
         Depends: libboost-log1.62.0 (>= 1.62.0) but it is not installable or
                  libboost-log1.65.1 (>= 1.65.1) but it is not installable or
                  libboost-log1.67.0 (>= 1.67.0) but it is not installable or
                  libboost-log1.71.0 (>= 1.71.0) but it is not going to be installed or
                  libboost-log1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-filesystem1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-log1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-thread1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libfftw3-single3 (>= 3.3.5) but 3.3.4-2+rvt is to be installed
         Depends: libgfortran5 (>= 10) but it is not going to be installed
         Depends: libqt5core5a (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5gui5 (>= 5.14.1) but 5.3.2+dfsg-4+rpi1 is to be installed or
                  libqt5gui5-gles (>= 5.14.1) but it is not going to be installed
         Depends: libqt5network5 (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5serialport5 (>= 5.6.0) but it is not going to be installed
         Depends: libqt5sql5 (>= 5.10.0) but it is not going to be installed
         Depends: libqt5widgets5 (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libstdc++6 (>= 7) but 4.9.2-10 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
pi@raspberrypi:~ $
2
Repair / Re: TDS744A: 1M input impedance measures: Ch3 = 160Kohm, Ch4 = 706KOhm [resolved]
« Last post by andy2000 on Today at 11:07:32 pm »
I recommend avoiding "organic acid, water soluble" flux unless you absolutely need to use a flux that can be cleaned with water.  It's conductive (as you found out), and corrosive if not cleaned completely off.  It's not very soluble in the solvents used to clean rosin flux off such as alcohol, or acetone.  It's not a good choice for a general purpose flux.  It's meant for situations where the solvent needed to remove rosin flux would cause damage, or for mass production where it's desirable to be able to clean boards with water rather than volatile chemicals that are expensive, or banned. 
3
RF, Microwave, Ham Radio / Re: WSJT-X on Pi
« Last post by metrologist on Today at 11:06:28 pm »
Moer

pi@raspberrypi:~ $ sudo apt install libqt5serialport5
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 libc6-dbg : Depends: libc6 (= 2.19-18+deb8u7) but 2.31-13+rpi1+deb11u8 is to be installed
 libc6-dev : Depends: libnsl-dev but it is not going to be installed
 libcrypt-dev : Breaks: manpages-dev (< 5.01-1) but 3.74-1 is to be installed
 libnih1 : Depends: libc6 (< 2.20) but 2.31-13+rpi1+deb11u8 is to be installed
 libqt5serialport5 : Depends: libqt5core5a (>= 5.15.2+dfsg~) but 5.3.2+dfsg-4+rpi1 is to be installed
                     Depends: libstdc++6 (>= 5) but 4.9.2-10 is to be installed
                     Depends: qtbase-abi-5-15-2
 manpages : Breaks: manpages-dev (< 5.09-2) but 3.74-1 is to be installed
 openssh-sftp-server : Depends: openssh-client (= 1:6.7p1-5+deb8u3) but 1:8.4p1-5+deb11u3 is to be installed
 wsjtx : Depends: libgfortran5 (>= 8.3) but it is not going to be installed or
                  libgfortran4 (>= 7.3) but it is not going to be installed or
                  libgfortran3 (>= 6.3) but 4.9.2-10 is to be installed
         Depends: libgomp1 (>= 6) but 4.9.2-10 is to be installed
         Depends: libqt5multimedia5-plugins (>= 5.7) but it is not going to be installed
         Depends: libqt5widgets5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5network5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5printsupport5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5sql5-sqlite (>= 5.7) but it is not going to be installed
         Depends: libboost-log1.62.0 (>= 1.62.0) but it is not installable or
                  libboost-log1.65.1 (>= 1.65.1) but it is not installable or
                  libboost-log1.67.0 (>= 1.67.0) but it is not installable or
                  libboost-log1.71.0 (>= 1.71.0) but it is not going to be installed or
                  libboost-log1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-filesystem1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-log1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-thread1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libfftw3-single3 (>= 3.3.5) but 3.3.4-2+rvt is to be installed
         Depends: libgfortran5 (>= 10) but it is not going to be installed
         Depends: libqt5core5a (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5gui5 (>= 5.14.1) but 5.3.2+dfsg-4+rpi1 is to be installed or
                  libqt5gui5-gles (>= 5.14.1) but it is not going to be installed
         Depends: libqt5multimedia5 (>= 5.6.0~beta) but it is not going to be installed
         Depends: libqt5network5 (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5sql5 (>= 5.10.0) but it is not going to be installed
         Depends: libqt5widgets5 (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libstdc++6 (>= 7) but 4.9.2-10 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
pi@raspberrypi:~ $
4
RF, Microwave, Ham Radio / Re: WSJT-X on Pi
« Last post by metrologist on Today at 11:03:40 pm »
Keep swimming or is this drowning?

pi@raspberrypi:~ $ apt-get -f install
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
pi@raspberrypi:~ $
5
RF, Microwave, Ham Radio / Re: WSJT-X on Pi
« Last post by metrologist on Today at 11:02:16 pm »
OK, I did this:

pi@raspberrypi:~ $ sudo apt install libgfortran5
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 libc6-dbg : Depends: libc6 (= 2.19-18+deb8u7) but 2.31-13+rpi1+deb11u8 is to be installed
 libc6-dev : Depends: libnsl-dev but it is not going to be installed
 libcrypt-dev : Breaks: manpages-dev (< 5.01-1) but 3.74-1 is to be installed
 libnih1 : Depends: libc6 (< 2.20) but 2.31-13+rpi1+deb11u8 is to be installed
 manpages : Breaks: manpages-dev (< 5.09-2) but 3.74-1 is to be installed
 openssh-sftp-server : Depends: openssh-client (= 1:6.7p1-5+deb8u3) but 1:8.4p1-5+deb11u3 is to be installed
 wsjtx : Depends: libgomp1 (>= 6) but 4.9.2-10 is to be installed
         Depends: libqt5serialport5 (>= 5.7) but it is not going to be installed
         Depends: libqt5multimedia5-plugins (>= 5.7) but it is not going to be installed
         Depends: libqt5widgets5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5network5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5printsupport5 (>= 5.7) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5sql5-sqlite (>= 5.7) but it is not going to be installed
         Depends: libboost-log1.62.0 (>= 1.62.0) but it is not installable or
                  libboost-log1.65.1 (>= 1.65.1) but it is not installable or
                  libboost-log1.67.0 (>= 1.67.0) but it is not installable or
                  libboost-log1.71.0 (>= 1.71.0) but it is not going to be installed or
                  libboost-log1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-filesystem1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-log1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libboost-thread1.74.0 (>= 1.74.0) but it is not going to be installed
         Depends: libfftw3-single3 (>= 3.3.5) but 3.3.4-2+rvt is to be installed
         Depends: libqt5core5a (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5gui5 (>= 5.14.1) but 5.3.2+dfsg-4+rpi1 is to be installed or
                  libqt5gui5-gles (>= 5.14.1) but it is not going to be installed
         Depends: libqt5multimedia5 (>= 5.6.0~beta) but it is not going to be installed
         Depends: libqt5network5 (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libqt5serialport5 (>= 5.6.0) but it is not going to be installed
         Depends: libqt5sql5 (>= 5.10.0) but it is not going to be installed
         Depends: libqt5widgets5 (>= 5.15.1) but 5.3.2+dfsg-4+rpi1 is to be installed
         Depends: libstdc++6 (>= 7) but 4.9.2-10 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
pi@raspberrypi:~ $
6
Beginners / Re: Convert US standard 115V to International 230V
« Last post by am1 on Today at 11:01:22 pm »
Thank you all for the suggestions, this is very helpful. It is a stationary robotic gait trainer for those wondering, and this is an existing system that I am now involved in. I am a bit confused by those mentioning it already being transformer, could you please elaborate, for reference the 2 PSU I am using in the system are Meanwell HRP-150-24 and HRP-600-36 units.

I am leaning towards something external due to the retesting and timeline concerns mentioned previously.. I was initially looking for step down transformers for the voltage conversion that would be a simple plug and play system. I would need the inlet transformer to accept the NEMA 5-20P power cord from our device and the transformer power cord in the appropriate cord type for Saudi (country in question). Is anyone familiar with options like this?

This is one example I came across that can be step up/down and has a toroidal core. It has a US plug type though so unsure of this unit in particular. Is there a reason to avoid this type of solution for a short term option until a system redesign can occur (reliability, safety, etc.)? I appreciate the advice from everyone, thanks.

https://www.vevor.com/variable-transformer-c_10755/vevor-step-up-down-transformer-voltage-converter-3500w-240v-110v-110v-240v-us-uk-p_010501337904?adp=gmc&srsltid=AfmBOoqn1_dCr4bXi68PtPUSOyP3iJSVOoAxBIdkQxGat7TJNGC4JEms_XI
7
RF, Microwave, Ham Radio / Re: WSJT-X on Pi
« Last post by metrologist on Today at 10:54:39 pm »
The links to the princeton site I found went to 404. I don't like to download from SourceForge but that's all I could find.

Here is the issue:

pi@raspberrypi:~/Downloads $ sudo dpkg -i wsjtx_2.6.1_armhf.deb

(Reading database ... 113061 files and directories currently installed.)
Preparing to unpack wsjtx_2.6.1_armhf.deb ...
Unpacking wsjtx (2.6.1) over (2.6.1) ...
dpkg: dependency problems prevent configuration of wsjtx:
 wsjtx depends on libgfortran5 (>= 8.3) | libgfortran4 (>= 7.3) | libgfortran3 (>= 6.3); however:
  Package libgfortran5 is not installed.
  Package libgfortran4 is not installed.
  Version of libgfortran3:armhf on system is 4.9.2-10.
 wsjtx depends on libgomp1 (>= 6); however:
  Version of libgomp1:armhf on system is 4.9.2-10.
 wsjtx depends on libqt5serialport5 (>= 5.7); however:
  Package libqt5serialport5 is not installed.
 wsjtx depends on libqt5multimedia5-plugins (>= 5.7); however:
  Package libqt5multimedia5-plugins is not installed.
 wsjtx depends on libqt5widgets5 (>= 5.7); however:
  Version of libqt5widgets5:armhf on system is 5.3.2+dfsg-4+rpi1.
 wsjtx depends on libqt5network5 (>= 5.7); however:
  Version of libqt5network5:armhf on system is 5.3.2+dfsg-4+rpi1.
 wsjtx depends on libqt5printsupport5 (>= 5.7); however:
  Version of libqt5printsupport5:armhf on system is 5.3.2+dfsg-4+rpi1.
 wsjtx depends on libqt5sql5-sqlite (>= 5.7); however:
  Pa
dpkg: error processing package wsjtx (--install):
 dependency problems - leaving unconfigured
Processing triggers for gnome-menus (3.13.3-6) ...
Processing triggers for desktop-file-utils (0.22-1) ...
Processing triggers for mime-support (3.58) ...
Errors were encountered while processing:
 wsjtx
pi@raspberrypi:~/Downloads $
8
Computers / Ubuntu 24.04 LTS full disk encryption setup
« Last post by Someone on Today at 10:53:48 pm »
One of the headline features of the new Ubuntu 24.04 LTS is seamless full disk encryption:
https://ubuntu.com/blog/tpm-backed-full-disk-encryption-is-coming-to-ubuntu
But there is a complete dearth of guidance on how to get it working and plenty of frustrated attempt/resignations. Here is what worked for me.

In the UEFI/BIOS there were several supporting setting that needed to be toggled.
Without those the OS would immediately ask for the recovery keys on the first reboot, before the user was able to extract them (the snap recovery --show-keys instruction in the installer). The TPM based FDE works nicely and saves having another password in the login process. Sadly it does require a full re-install from scratch to setup.
9
Projects, Designs, and Technical Stuff / Re: Passing 2 wires into a hot water cylinder
« Last post by Benta on Today at 10:49:35 pm »
Why do the wires need to into your vessel?
Make a water/pressure proof probe that you can stick into it. Place the sensor inside that.
10
Beginners / Re: Put LC filter before or after LDO?
« Last post by Manul on Today at 10:47:51 pm »
Generally you want overdamped RLC, but the internal resistance of inductor and capacitor is often too small. So you want to add some extra R. The problem in this case is that there is no place for extra R, because voltage margin is so small. If you would have say 1V or 2V margin, then you could easily add extra resistance and have a nice filter with no peaking. But it will exhibit voltage drop. More capacitance also helps. Placing filter at the input side is better/safer if you are not 100% sure of what you are doing.
Pages: [1] 2 3 4 5 6 ... 10 Next

EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee