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Hacker Public Radio

Your ideas, projects, opinions - podcasted.

New episodes Monday through Friday.

Welcome to HPR the Community Podcast Network

We started producing shows as Today with a Techie on 2005-09-19, 15 years, 1 months, 14 days ago. Our shows are produced by listeners like you and can be on any topic that "are of interest to Hackers". If you listen to HPR then please consider contributing one show a year. If you record your show now it could be released in 7 days.

Meet the team

Please help out tagging older shows !

Call for shows

We are running very low on shows at the moment. Have a look at the hosts page and if you don't see "2020-??-??" next to your name, or if your name is not listed, you might consider sending us in something.

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Latest Shows

hpr3194 :: Linux Inlaws S01E16: The count and the questions

Linux Inlaws S01E16: This is Linux Inlaws, a series on free and open source software, black humour a

Hosted by monochromec on 2020-10-29 is flagged as Explicit and released under a CC-BY-SA license.
Tags: Count, questions, vlad, legends, Halloween.
Listen in ogg, spx, or mp3 format. Series: Linux Inlaws | Comments (0)

hpr3193 :: Meet Antithesis

Meet my new computer, a Pinebook Pro, as I explain my rationale, unbox it, and set it up.

Hosted by Paul Quirk on 2020-10-28 is flagged as Clean and released under a CC-BY-SA license.
Tags: Pinebook,Pro,64,unboxing.
Listen in ogg, spx, or mp3 format. Series: Hardware upgrades | Comments (0)

This is the place:

hpr3192 :: A light bulb moment, part 3

The LED revolution

Hosted by MrX on 2020-10-27 is flagged as Explicit and released under a CC-BY-SA license.
Tags: Electrical, Hacks.
Listen in ogg, spx, or mp3 format. Comments (0)

LED History

The history of the LED revolution is both long and complex but I'll do my best to cover it. Please forgive me if I mispronounce some of the materials and processes I'm not a lighting expert as I stated right back at the beginning of this series.

The following excerpts are from Wikipedia; the link will be in the show notes,

The LED or Light Emitting Diode first appeared as a practical electronic component in 1962, the earliest LEDs emitted low-intensity infrared light.[7] Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics. The first visible-light LEDs were of low intensity and limited to red. Modern LEDs are available across the visible, ultraviolet, and infrared wavelengths, with high light output. A great deal of development and refinement was required to get to this point.

The first commercial visible-wavelength LEDs were commonly used as replacements for incandescent and neon indicator lamps, and in seven-segment displays,[31] first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as calculators, TVs, radios, telephones, as well as watches (see list of signal uses). Until 1968, visible and infrared LEDs were extremely costly, in the order of US$200 per unit, and so had little practical use.[32]

In 1968 Monsanto was the first organization to mass-produce visible LEDs, these were red LEDs suitable for indicators.[32]

In February 1969, Hewlett-Packard introduced the HP Model 5082-7000 Numeric Indicator, the first LED device to use integrated circuit (integrated LED circuit) technology.[33] It was the first intelligent LED display, and was a revolution in digital display technology, replacing the Nixie tube and becoming the basis for later LED displays.[36]

The early red LEDs were bright enough only for use as indicators, as the light output was not enough to illuminate an area. Readouts in calculators were so small that plastic lenses were built over each digit to make them legible. Later, other colors became widely available and appeared in appliances and equipment.

The first blue-violet LED using magnesium-doped gallium nitride was made at Stanford University in 1972 by Herb Maruska and Wally Rhines

In 1973 Pankove and Ed Miller demonstrated the first blue electroluminescence from zinc-doped gallium nitride, though the subsequent device Pankove and Miller built, the first actual gallium nitride light-emitting diode, emitted green light.[49][50]

Today, magnesium-doping of gallium nitride remains the basis for all commercial blue LEDs and laser diodes. In the early 1970s, these devices were too dim for practical use, and research into gallium nitride devices slowed.

In 1993, high-brightness blue LEDs were demonstrated by Shuji Nakamura of Nichia Corporation using a gallium nitride growth process.[56][57][58] In parallel, Isamu Akasaki and Hiroshi Amano in Nagoya were working on developing the important GaN deposition on sapphire substrates and the demonstration of p-type doping of GaN. This new development revolutionized LED lighting, making high-power blue light sources practical, leading to the development of technologies like Blu-ray[citation needed].

In 1995, Alberto Barbieri at the Cardiff University Laboratory (GB) investigated the efficiency and reliability of high-brightness LEDs and demonstrated a "transparent contact" LED using indium tin oxide (ITO) on (AlGaInP/GaAs).

In 2001[62] and 2002,[63] processes for growing gallium nitride (GaN) LEDs on silicon were successfully demonstrated.

In January 2012, Osram demonstrated high-power InGaN LEDs grown on silicon substrates commercially,[64] and GaN-on-silicon LEDs are in production at Plessey Semiconductors.

White LEDs and the illumination breakthrough

Even though white light can be created using individual red, green and blue LEDs, this results in poor color rendering, since only three narrow bands of wavelengths of light are being emitted. The attainment of high efficiency blue LEDs was quickly followed by the development of the first white LED. In this device a cerium doped phosphor coating produces yellow light through fluorescence. The combination of that yellow with remaining blue light appears white to the eye. Using different phosphors produces green and red light through fluorescence. The resulting mixture of red, green and blue is perceived as white light, with improved color rendering compared to wavelengths from the blue LED/YAG phosphor combination.

The first white LEDs were expensive and inefficient. However, the light output of LEDs has increased exponentially. The latest research and development has been propagated by Japanese manufacturers such as Panasonic, and Nichia, and by Korean and Chinese manufacturers such as Samsung, Kingsun, and others. This trend in increased output has been called Haitz's law after Dr. Roland Haitz.[79]

Figure 1
Figure 1
Illustration of Haitz's law, showing improvement in light output per LED over time, with a logarithmic scale on the vertical axis

Light output and efficiency of blue and near-ultraviolet LEDs rose and the cost of reliable devices fell. This led to relatively high-power white-light LEDs for illumination, which are replacing incandescent and fluorescent lighting.[80][81]

Experimental white LEDs have been demonstrated to produce 303 lumens per watt of electricity (lm/w); some can last up to 100,000 hours.[82][83] However, commercially available LEDs have an efficiency of up to 223 lm/w.[84][85][86]

Below are some comparisons for incandescent bulbs

Some figures I found online from Wikipedia

(Example figure for Standard Incandescent bulb only 12.6 lm / W)

(Example figures for Halogen bulb being 24 lm / W)

With LEDs continuing to get cheaper and even though for now they cost more than traditional bulbs, having this huge increase in electrical efficiency means the overall cost is significantly cheaper than that of incandescent bulbs.[87]

While indicator LEDs are known for their extremely long life, up to 100,000 hours, lighting LEDs are operated much less conservatively, and consequently have shorter lives. LED technology is useful for lighting designers, because of its low power consumption, low heat generation, instantaneous on/off control, and in the case of single color LEDs, continuity of color throughout the life of the diode and relatively low cost of manufacture. LED lifetime depends strongly on the temperature of the diode. Operating an LED lamp in conditions that increase the internal temperature can greatly shorten the lamp's life.

I now use LED lighting in my own home particularly in the areas where lighting is on for extended periods such as in the living room.

As you can see we have come an extremely long way in a relatively short space of time with advancements continuing to accelerate.

It's hard to appreciate the massive impact electric lighting has had on the world.

It's even harder to imagine living in a time not that long ago where an expensive candle producing a puny amount illumination was the only source of light, with the added not inconsiderable fire risk of having a naked flame sharing a room with combustible materials.

With all these deterrents it's little wonder that people just went to bed when the sun went down.

hpr3191 :: Swedish Corona Experience

I will cover my experience of the Corona virus

Hosted by Daniel Persson on 2020-10-26 is flagged as Clean and released under a CC-BY-SA license.
Tags: corona, sweden.
Listen in ogg, spx, or mp3 format. Series: Health and Healthcare | Comments (1)

Swedish Health Authority Recommendation

  • If sick stay at home.
  • If you have symptoms take a test.
  • Wash at least 20 seconds use alcohol with atleast 60% alcohol content.
  • Don't touch your face with unwashed hands.
  • Keep distance arm length (or 2m).
  • Don't gather in large companies.
  • Avoid public transport, try walking or biking when possible.
    • If required go with public transport book a ticket or go when others don't.
  • If possible work from home.

hpr3190 :: GIMP Brushes

Paint tools, and particularly the Paintbrush Tool, require the use of brushes.

Hosted by Ahuka on 2020-10-23 is flagged as Clean and released under a CC-BY-SA license.
Tags: GIMP, images, photos, graphics, brushes.
Listen in ogg, spx, or mp3 format. Series: GIMP | Comments (0)

Brushes are a key part of using Paint tools, and in particular the Paintbrush Tool. And in this episode we look at how to work with, edit, download, and save different brushes. We look at the Brush Dialog, and examine the different settings that make them easier to work with.


hpr3189 :: How the Dutch dig Graves

Ken explains how they dig graves when the ground is essentially sand

Hosted by Ken Fallon on 2020-10-22 is flagged as Explicit and released under a CC-BY-SA license.
Tags: graves, sand, How Holland Works, Dutch, Netherlands.
Listen in ogg, spx, or mp3 format. Comments (2)

On a lock down walk in the local grave yard, Ken and his Wife stumble upon a new grave. As the soil is mostly sand, the graves need to be shored up to prevent collapse.

hpr3188 :: Thrift store quick fix

Fixing up a dog coat for the cool weather.

Hosted by Archer72 on 2020-10-21 is flagged as Clean and released under a CC-BY-SA license.
Tags: sewing.
Listen in ogg, spx, or mp3 format. Comments (0)

Thrift store quick fix for a dog coat.

  1. Ripped out stitches on defective velcro.

Picture 1
Picture 1

  1. Re-stitched with the flat surface facing up.

Picture 2
Picture 2

Picture 3
Picture 3

  1. Hot-glued replacement velcro.

Picture 4
Picture 4

  1. Profit

Picture 5
Picture 5

hpr3187 :: Ansible for Dynamic Host Configuration Protocol

How I use ansible to configure my OpenBSD router

Hosted by norrist on 2020-10-20 is flagged as Clean and released under a CC-BY-SA license.
Tags: ansible, dhcp, dns, openbsd.
Listen in ogg, spx, or mp3 format. Comments (1)

Ansible DHCPD and DNS

Using Ansible to configure DHCPD and NDS on OpenBSD

  • Host data is stored in csv files
  • Ansible templates to create config files
  • Restart services


- hosts: localhost
  - name: read subnet 10
      path: 10.csv
      fieldnames: mac,ip,hostname
    register: subnet_10
  - name: read subnet 11
      path: 11.csv
      fieldnames: mac,ip,hostname
    register: subnet_11
  - name: read static
      path: static.csv
      fieldnames: hostname,ip
    register: static_ip

  - name: write dhcp file
      src: dhcpd.conf.j2
      dest: /etc/dhcpd.conf
      validate: dhcpd -nc %s
  - name: write local.lan zone file
      dest: /var/nsd/zones/master/local.lan
      owner: root
      group: _nsd
      validate: nsd-checkzone local.lan %s
  - name: nsd_conf
      src: nsd.conf
      dest: /var/nsd/etc/nsd.conf
      owner: root
      group: _nsd
      validate: nsd-checkconf %s
  - name: restart nsd
      name: nsd
      state: restarted
  - name: restart dhcpd
      name: dhcpd
      state: restarted
  - name: restart unbound
      name: unbound
      state: restarted






option  domain-name "local.lan";
option  domain-name-servers;

subnet netmask {
        option routers;
        {% for host in subnet_10.list %}
        host static-client { hardware ethernet {{ host.mac }};fixed-address {{ host.ip }};} #{{ host.hostname }}
        {% endfor %}

subnet netmask {
    option routers;
{% for host in subnet_11.list %}
host static-client { hardware ethernet {{ host.mac }};fixed-address {{ host.ip }};} #{{ host.hostname }}
{% endfor %}

Rendered DHCP entires

host static-client { hardware ethernet b8:27:eb:de:2f:38;fixed-address;} #pi3a
host static-client { hardware ethernet 28:10:7b:25:d5:60;fixed-address;} #ipcam3
host static-client { hardware ethernet 28:10:7b:0c:fa:7b;fixed-address;} #ipcam1

$TTL 3600
local.lan. IN     SOA root. (
                2016092901  ; Serial
                3H          ; refresh after 3 hours
                1H          ; retry after 1 hour
                1W          ; expire after 1 week
                1D)         ; minimum TTL of 1 day

IN  NS  gate.

IN  MX  50 gate.local.lan.

local.lan.      IN A

{% for host in static_ip.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}

{% for host in subnet_10.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}

{% for host in subnet_11.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}

Rendered A records

pi3b IN A
pi3a IN A
ipcam3 IN A
ipcam1 IN A

Run the playbook

ansible-playbook hostname-setup.yml

hpr3186 :: A light bulb moment, part 2

The history of lighting

Hosted by MrX on 2020-10-19 is flagged as Clean and released under a CC-BY-SA license.
Tags: Hardware, electrical.
Listen in ogg, spx, or mp3 format. Comments (0)

A very brief history of lighting

Natural light first came from fire

Then using oil and fat with a wick

Early candles used animal fat this smelled awful and tended to spit

Some parts of world used whole animals as candles

These early candles gave so little light that people generally just went to bed at sunset

Electric lighting started first by Humphry Davy in the early 1800’s using an arc, this was developed into commercial lighting in the 1840s

Arc lighting needed a complex mechanism to gradually push the contacts together as they burnt away

Gas lighting started around the 1850s this was improved in the 1870 with the advent of the Gas mantel.

Thomas Edison develop the electric light bulb in 1879 using a carbon filament. It took a great deal of effort to convince people to use it because gas lighting was so well established and worked well.

Many houses in Britain didn't install electric lighting until the 1930s

Finally electricity won as it could be used for so many other things.

The tungsten filament bulb

The filament within the bulb is made up of a tungsten coiled coil wire. This is done because the more compactly a filament can be wound the less heat is lost to the surroundings and the brighter the bulb will glow.

The tungsten halogen bulb

The next progression was tungsten halogen bulb, these bulbs are more efficient and give out twice as much light as ordinary bulbs and usually last twice as long.

All filament lights waste a lot of energy producing heat. An ordinary light bulb only gives out 10% of its energy as light, the rest is wasted as heat.

Fluorescent neon lights

Fluorescent neon lights were invented in 1905 by a French man called George Claude. These were used for advertising mainly in America.

Fluorescent strip light

The first fluorescent light was introduced in 1939 it uses the same principle as the neon light but incorporates a filament at both ends. It is filled with argon and mercury vapour. It mainly gives off ultra violet light the tube is coated on the inside with chemicals to convert the output to mostly visible light using a property called fluorescence.

Fluorescent tubes are four times as efficient as normal incandescent light bulbs and run cool.

The first energy efficient light bulbs were just fluorescent lights folded into a compact bulb shape.

Sodium lights

Sodium lights used mainly in street lighting are twice as efficient again as fluorescent bulbs they give off a rather horrible orange colour.

The first commercial high-pressure sodium lamps were available in 1965 from companies in the United States, the United Kingdom, and the Netherlands; at introduction a 400 watt lamp would produce around 100 lumens per watt

The next big development was LED lighting which I'll cover in my next episode.

hpr3185 :: Pandemics In History

Infectious disease is one of the most important factors influencing human history

Hosted by Ahuka on 2020-10-16 is flagged as Clean and released under a CC-BY-SA license.
Tags: Health, Infectious Disease, History, Pandemics.
Listen in ogg, spx, or mp3 format. Series: Health and Healthcare | Comments (2)

This is a look at how infectious diseases have changed the course of human history. It is admittedly a bit Euro- or Western-centric since that is what I know best. But I think the point of its importance applies more broadly.

Previous five weeks

hpr3184 :: Linux Inlaws S01E15: IT Security and stick insects hosted by monochromec

Released: 2020-10-15. Duration: 00:56:08. Flag: Clean. Series: Linux Inlaws.
Tags: IT Security, stick insects, Rainbow Escorts, Grumpy Old Coders.
How to secure photos of your stick insect collection and more

hpr3183 :: Don't trust zipfiles hosted by Cedric De Vroey

Released: 2020-10-14. Duration: 00:04:37. Flag: Clean. Series: Privacy and Security.
Tags: pentesting,security,hacking,zip.
Zipfiles can contain all kinds of evilness and unpacking them can lead to unexpected results

hpr3182 :: Yo-ho-ho, and a bottle of Cholecalciferol hosted by Dave Morriss

Released: 2020-10-13. Duration: 01:19:23. Flag: Explicit.
Tags: COVID-19,SARS-Cov-2,Vitamin D,6502 microprocessor,BBC Micro.
From Scotland, two HPR hosts chew the fat

hpr3181 :: RealVNC cloud offering hosted by JWP

Released: 2020-10-12. Duration: 00:04:22. Flag: Explicit.
Tags: realvnc, remote computing.
JWP emails in a show about using VNC while out and about

hpr3180 :: GIMP: Miscellaneous Tools hosted by Ahuka

Released: 2020-10-09. Duration: 00:13:23. Flag: Clean. Series: GIMP.
Tags: GIMP, images, photos, graphics, paths, zoom, GEGL.
These few remaining tools are important, but don't fit neatly into one category.

hpr3179 :: MakeMKV to back up media, and a Question hosted by Archer72

Released: 2020-10-08. Duration: 00:06:44. Flag: Clean.
Tags: dvd, blu-ray, backup.
Describing two ways to install MakeMKV DVD/Blu-ray backup program on Fedora 32

hpr3178 :: Finishing the Recumbent Bicycle hosted by Brian in Ohio

Released: 2020-10-07. Duration: 00:04:19. Flag: Clean. Series: Bicycle Hacking.
Tags: bicycle, recumbent.
While channeling Stephen Hawking, Brian in Ohio describes finishing and riding the bike

hpr3177 :: Zero cost VPN hosted by norrist

Released: 2020-10-06. Duration: 00:06:47. Flag: Clean.
Tags: VPN, OpenVPN.
OpenVPN on a Free Tier VPS for securing phone trafic

hpr3176 :: HPR Community News for September 2020 hosted by HPR Volunteers

Released: 2020-10-05. Duration: 01:09:47. Flag: Explicit. Series: HPR Community News.
Tags: Community News.
HPR Volunteers talk about shows released and comments posted in September 2020

hpr3175 :: International Keyboard hosted by Ahuka

Released: 2020-10-02. Duration: 00:11:21. Flag: Clean.
Tags: Spanish, Language learning, typing foreign characters.
How I learned to implement a keyboard that lets me type in Spanish

hpr3174 :: Linux Inlaws S01E14: The big programming language panel hosted by monochromec

Released: 2020-10-01. Duration: 00:52:54. Flag: Explicit. Series: Linux Inlaws.
Tags: C++, Python, Rust, Rainbow Escorts, Halloween.
Our heroes host an eclectic panel of experts discussion C(++), Python and Rust.

hpr3173 :: Manage your Raspberry Pi fleet with Ansible hosted by Ken Fallon

Released: 2020-09-30. Duration: 00:20:09. Flag: Clean.
Tags: raspberrypi, rasbian, ansible,
A solution to the problem of updating difficult-to-reach Raspberry Pis in the enterprise.

hpr3172 :: A ramble with the Pentland Squires (part 2) hosted by Dave Morriss

Released: 2020-09-29. Duration: 00:49:43. Flag: Explicit.
Tags: COVID-19,physical isolation,discussion.
Second half of the chat between MrX and Dave Morriss

hpr3171 :: A Week On Soylent hosted by lostnbronx

Released: 2020-09-28. Duration: 00:12:15. Flag: Clean.
Tags: soylent, food, health, diet, lostnbronx.
Lostnbronx tries eating nothing but Soylent, so you don't have to.

hpr3170 :: GIMP: Color Tools hosted by Ahuka

Released: 2020-09-25. Duration: 00:19:59. Flag: Clean. Series: GIMP.
Tags: GIMP, images, photos, graphics, color.
With Color Tools you can adjust the colors and brightness of an image.

hpr3169 :: Ludwig van Beethoven with a hint of Chopin hosted by Paul Quirk

Released: 2020-09-24. Duration: 00:41:58. Flag: Clean. Series: All Songs Considered.
Tags: Ludwig Van Beethoven,Fredrick Chopin,classical,energetic,music,public domain.
A fine treat to satisfy your earholes.

hpr3168 :: FreeBSD Jails and iocage hosted by norrist

Released: 2020-09-23. Duration: 00:08:51. Flag: Clean.
Tags: BSD.
Use iocage to manage freebsd jails

hpr3167 :: A ramble with the Pentland Squires (part 1) hosted by Dave Morriss

Released: 2020-09-22. Duration: 00:42:27. Flag: Explicit.
Tags: COVID-19,physical isolation,discussion.
MrX and Dave Morriss chat from opposite sides of the Pentland Hills, Edinburgh

hpr3166 :: Using Ansible to mirror a Git repo hosted by klaatu

Released: 2020-09-21. Duration: 00:26:20. Flag: Clean.
Tags: ansible,sysadmin,git.
Klaatu uses Ansible to mirror a Git repo on two separate Git hosts

hpr3165 :: Spanish Tools Continued hosted by Ahuka

Released: 2020-09-18. Duration: 00:13:50. Flag: Clean.
Tags: Spanish, Language learning.
Part two of how I am using a variety of tools to learn Spanish

hpr3164 :: I'm Learning Spanish hosted by Ahuka

Released: 2020-09-17. Duration: 00:16:29. Flag: Clean.
Tags: Spanish, Language learning.
How I am using a variety of tools to learn Spanish

hpr3163 :: Linux Inlaws S01E13: The road to communism and freedom hosted by monochromec

Released: 2020-09-16. Duration: 01:04:15. Flag: Explicit. Series: Linux Inlaws.
Tags: open source, communism, escort services, freedom, Mach, VMS, accounts.
Our old heroes discuss their legacy and how they arrived at open source software and communism

hpr3162 :: Introduction to Ansible hosted by klaatu

Released: 2020-09-15. Duration: 00:44:34. Flag: Clean.
Tags: ansible,sysadmin.
Klaatu demonstrates some Ansible tricks, and how Ansible can be a better choice than scripting.

hpr3161 :: How I manage podcast listening hosted by Dave Morriss

Released: 2020-09-14. Duration: 00:19:52. Flag: Explicit.
Tags: podcast,software,mp3 player,database.
Another reply to MrX's episode on how he listens to podcasts

hpr3160 :: GIMP: Transform Tools hosted by Ahuka

Released: 2020-09-11. Duration: 00:16:32. Flag: Clean. Series: GIMP.
Tags: GIMP, images, photos, graphics, transform.
With Transform Tools you can stretch, move, and crop the image.

hpr3159 :: Vivaldi - The Four Seasons hosted by Paul Quirk

Released: 2020-09-10. Duration: 00:45:03. Flag: Clean. Series: All Songs Considered.
Tags: Vivaldi, four seasons, creative commons.
All four movements of Vivaldi's Four Seasons, celebrating the Creative Commons license

hpr3158 :: Fingerprint access control? LOL... hosted by Cedric De Vroey

Released: 2020-09-09. Duration: 00:20:01. Flag: Clean. Series: Privacy and Security.
Tags: pentesting,security,hacking,biometrics.
A story about pentesting physical security

hpr3157 :: Compost hosted by klaatu

Released: 2020-09-08. Duration: 00:43:03. Flag: Clean. Series: Cooking.
Tags: food, rubbish, landfill, gardening.
How and why to compost

hpr3156 :: HPR Community News for August 2020 hosted by HPR Volunteers

Released: 2020-09-07. Duration: 01:10:02. Flag: Explicit. Series: HPR Community News.
Tags: Community News.
HPR Volunteers talk about shows released and comments posted in August 2020

hpr3155 :: LastPass Security Dashboard hosted by Ahuka

Released: 2020-09-04. Duration: 00:11:20. Flag: Clean. Series: Privacy and Security.
Tags: LastPass, passwords, security, monitoring.
A recent update to LastPass added a Security Dashboard

hpr3154 :: Make NextCloud your next cloud hosted by Paul Quirk

Released: 2020-09-03. Duration: 00:12:51. Flag: Clean.
Tags: Raspberry Pi,NextCloud,federated.
I go into my reasons for using NextCloud, what it is, and why you might want it.

hpr3153 :: Fixing eBooks with Calibre and pdfcrop hosted by Ken Fallon

Released: 2020-09-02. Duration: 00:05:08. Flag: Clean.
Tags: calibre,pdfcrop,epub,pdf.
Ken uses Calibre to convert a epub to PDF then uses pdfcrop to trim the margins

hpr3152 :: My Pocket Knives hosted by Dave Morriss

Released: 2020-09-01. Duration: 00:14:30. Flag: Explicit.
Tags: knife,pocket knife,penknife,Victorinox,Durol,Roxon.
I talk a little about some pocket knives I often carry

hpr3151 :: How I listen to podcasts hosted by Daniel Persson

Released: 2020-08-31. Duration: 00:06:33. Flag: Clean.
Tags: podcast,software,android.
This is a reply to MrX episode on how to listen to podcasts

hpr3150 :: GIMP: Paint Tools hosted by Ahuka

Released: 2020-08-28. Duration: 00:18:17. Flag: Clean. Series: GIMP.
Tags: GIMP, images, photos, graphics, paint, draw.
With Paint Tools you begin to operate on the image.

hpr3149 :: HPR AudioBook Club 21 - The Terrible Business of Salmon and Dusk hosted by HPR_AudioBookClub

Released: 2020-08-27. Duration: 01:45:42. Flag: Explicit. Series: HPR_AudioBookClub.
Tags: Audiobook, Review, Creative Commons.
The HPR Audiobook Club reviews the audiobook The Terrible Business of Salmon and Dusk by Myke Bartle

hpr3148 :: Why Open Source matters (to me) hosted by Paul Quirk

Released: 2020-08-26. Duration: 00:26:52. Flag: Clean.
Tags: history,open source,matters,vic 20,amiga,commodore.
I go briefly into my own history that has lead me to choose open source software exclusively.

hpr3147 :: NIST's Quantum Cryptography Update hosted by Ahuka

Released: 2020-08-25. Duration: 00:13:45. Flag: Clean. Series: Privacy and Security.
Tags: security, encryption, quantum computing.
NIST has concluded Round Two of the quantum encryption search and moved to Round Three

hpr3146 :: Help Me Help you with HPR eps! hosted by operat0r

Released: 2020-08-24. Duration: 00:05:58. Flag: Clean.
Tags: podcasting, hpr.
What should I do and how should I do it ?

hpr3145 :: A light bulb moment, part 1 hosted by MrX

Released: 2020-08-21. Duration: 00:10:49. Flag: Explicit.
Tags: Hardware, electrical.
Finding the working voltage of a bulb

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