Schedule

Schedule

Friday, December 19

1419033600 Tech News 2Night

Saturday, December 20

1419102000 The Tech Guy

Sunday, December 21

1419188400 The Tech Guy
1419202800 This Week in Tech

Monday, December 22

1419271200 Tech News Today
1419274800 Triangulation
1419280200 iPad Today
1419292800 Tech News 2Night

Tuesday, December 23

1419357600 Tech News Today
1419361200 MacBreak Weekly
1419368400 Security Now
1419375600 Before You Buy
1419379200 Tech News 2Night
1419382800 All About Android
1419391800 Padre's Corner

Wednesday, December 24

1419444000 Tech News Today
1419447600 Windows Weekly
1419454800 This Week in Google
1419465600 Tech News 2Night

Thursday, December 25

1419530400 Tech News Today
1419534000 Know How...
1419537600 Marketing Mavericks
1419543000 Coding 101
1419546600 Home Theater Geeks
1419553800 The Giz Wiz

Friday, December 26

1419616800 Tech News Today
1419638400 Tech News 2Night

Saturday, December 27

1419706800 The Tech Guy

Sunday, December 28

1419793200 The Tech Guy
1419807600 This Week in Tech

Monday, December 29

1419876000 Tech News Today
1419879600 Triangulation
1419885000 iPad Today

Most Recent Episodes

Tech News Today

The BBC has aired a new documentary slamming Apple

This Week in Computer Hardware

AMD Omega Driver, mechanical keys, and Broadwell NUC pics.

The Giz Wiz
Episode #1498: Inflate My Ego December 18th, 2014

TalkBand, disco lights, inflatable chair, and more!

Home Theater Geeks

Multichannel audio, speaker placement, and multiple subwoofers.

Tech News 2Night

A Security Flaw in Millions of Routers

Coding 101

Polishing up the holiday pricer.

Marketing Mavericks
Episode #35: Game of Drones December 18th, 2014

Taking an idea and taking off with it

Know How...

In case you didn't know this is Episode 123

Tech News Today

Hollywood caves in the face of threats from the Sony hackers.

Ham Nation

Ham Emergency Radio Operations(H.E.R.O) lends aid in the recent Philippine typhoon.

Know How... 66

How to Build a Raspberry Pi MAME and Choosing Your Podcasting Mic

October 25 2013

What kind of microphone is best for you, build your own raspberry pi MAME, how ROMs are made, and more.

Podcasting Mics 101
In this segment, Fr. Robert shows you how to go about choosing the right microphones for your podcasting setup. Dynamic or condenser, XLR or USB, cardioids or omnidirection, you'll be able to get the mic that fits your needs, style and budget.

Mics On Set

Name
Element
Pickup
Address
Freq. Response
Interface
Price

Audio Spectrum AS400
Dynamic
Cardioid
End
80Hz - 12kHz
XLR
~$20

MXL 990
Condenser
Cardioid
Side
30Hz - 20kHz
XLR
~$80

Audio Technica AT2020
Condenser
Cardioid
Side
20Hz - 20kHz
XLR
~$100

Audio Technica AT2020USB+
Condenser
Cardioid
Side
20Hz - 20kHz
USB
~$120

Sure mx391
Condenser
Omnidirectional
Omni
50Hz - 17kHz
XLR
~$130

Heil PR40
Dynamic
Cardioid
End
28Hz - 18kHz
XLR
~$320

Sennheiser ME66
Condenser
Super-Cardioid/lobar
End
40Hz - 20kHz
XLR
~$475

Step 1: Choose your Transducer
The first step in choosing the right microphone is to decide if you need a dynamic or condenser element.

Dynamic Microphones

In a dynamic microphone, soundwaves strike a diaphragm that is attached to a coil of wire. The diaphragm vibrates, moving the coil, passing it through a magnetic field created by a permanent magnet. As the coil moves through the magnetic field, a current is induced within the coil that is an electrical representation of the soundwave.

The Dynamic Mic differs from the condenser microphone in several ways. First, it doesn't require phantom power. Second, it is far more rugged: able to withstand physical shock and much higher sound pressures. Third, its frequency response tends to be narrower and curvy: meaning that it will respond to certain frequencies more than others.

Pros:
Durable
Self-Powered
Versatile (vocals, instruments, etc.) because it is NOT as sensitive to loudness.
High Gain before feedback, which makes them EXCELLENT for LIVE sound

Cons:
Narrower frequency response range than a Condenser microphone
Not good a distant or low volume sounds

Condenser Microphones

In a condenser microphone, the transducer is comprised of a diaphragm and an electrically charged backplate. As soundwaves vibrate the diaphragm it changes the electrical field generated by the backplate. That change in the field is an electrical representation of the soundwave.

Microphones that use condenser transducers typically have a flatter frequency response than their dynamic counterparts. This means that you get more accurate sound production across the entire range of frequencies, from vocals to woodwinds to strings.

The construction of a condenser element brings with it two important differences from a dynamic element. First, a condenser mic requires "phantom power" – typically 48-52 volts that must be provided by a pre-amp, the mixing board, on an integrated power source. Second, a condenser microphone is more fragile that its dynamic counterpart: physical blows to the microphone can permanently harm the audio qualities of the mic, as can too much sound pressure. (screaming into the mic or placing it too close to percussive instruments.)

Pros:
Wider frequency range
CAN provide a higher quality audio signal
Good for studios with controlled audio environments

Cons:
FRAGILE
Sensitive to loudness
Requires external power

Step 2: Choose your Mic Addressing and Polar Pattern

"End Firing" vs. "Side Address"

Mics can be either "End Firing" (in which the membrane is parallel to the microphone body) or "Side Address" (in which the membrane is perpendicular to the microphone body) – USALLY, but not always, side address microphone have larger diaphragms than end firing microphones.

Large Diaphragm Microphones (LDM) provide "deeper" sound. It "warms" the sound of whatever it's recording

Small Diaphragm Microphones (SDM) and best for wide frequency response and "fast" sounds (strings).

Polar Pattern

The "polar pattern" of a microphone is the "pickup pattern": a pattern that describes the different sensitivities that a transducer will have to sound generated in the 360 degrees surrounding the microphone.

http://en.wikipedia.org/wiki/Microphone#Microphone_polar_patterns

Most mics used in podcasting will have a cardioid polar pattern, but there are opportunities to use omnidirectional, supercardioid, and bi-directional polar patterns.

Step 3: Choose your Interface & Price
There are really only two interfaces you should consider for your studio mics, XLR and USB. XLR interfaces use balanced cables, allowing for long runs with very little interference. XLR interfaces are standard throughout the pro-audio world, meaning that an investment in a XLR microphone will most likely last you through the growth of your podcast. If you think that you want to use a mixer to mix together multiple audio streams, you will DEFINITELY want to use XLR mics.

USB Microphones like the AT 2020USB+ and the BlueMics Yetti are popular because they are quiet, easy to use and portable. They include a A/D (analog to Digital) converter within the microphone body, meaning that you don’t need a XLR-USB converter or a mixing board with computer output options. However, there are very few USB microphones that allow for multiple sources on a single computer.

Raspberry Pi M.A.M.E.

TD and editor extraordinaire Bryan Burnett was building himself a MAME (that stands for "Multiple Arcade Machine Emulator") with a Raspberry Pi.

This setup will work fine on either the 256MB or 512MB Raspberry Pi. Bryan tried this project with both models and they both work well.

The RetroPie Project has a lot of different emulators available, but he focused on the NES, SNES, and SEGA systems.

Materials list
Software

  • Cyberduck
  • TextWrangler or Notepad++

Parts List

  • Raspberry Pi (512) Model B
  • Pi Case
  • 8GB SD Card
  • USB SNES Controller
  • Keyboard
  • Mouse
  • Monitor
  • HDMI Cable

Step 1 Download & Install

Download Retro Pi image from PetRockBlock.com. Then make a bootable SD Card and extract Retro Pi. For a Mac, Bryan used the guide over at AllTheWare. If you've got a PC, you'll need WinDisk32 Imager.

Once you've made a bootable SD card, place it into Raspberry Pi and boot up!

Step 2 Boot Raspi and Set Up Emulation Station

When you first turn on Emulation Station you'll have to map your controller.

After that, exit out to terminal so you can set up your global emulator settings.

To set up your controller type the following in the terminal:
cd RetroPie/emulators/RetroArch/tools
./retroarch-joyconfig >> ~/RetroPie/configs/all/retroarch.cfg

Step 3 Raspi Config Setup

We're not done configuring things. Next up, go to terminal and type the following:
sudo raspi-config

At the Raspi Config window select the second option "expand_rootfs" and then press enter. You will be presented with a message saying "partition will be resized."

In the Raspi Config Menu select "memory_split." If you have the 256MB Model A enter "128" into the field. If you have the 512MB Model B enter "256" into the field.

Then exit to terminal.

Step 4 Update your Pi

Type the following into the terminal:
cd RetroPie-Setup
sudo ./retropie_setup.sh

Update script
Update binaries

Run Binaries-based Installation

**This can take awhile!**

Step 5 Move your ROMs and Edit your Config Files

Bryan found it easiest to FTP into the Raspberry Pi to get his ROMs on to the device. On the Pi, go to terminal and type "ifconfig" to find your IP address. Then use your favorite FTP client to move your ROMs to the Pi. Bryan used Cyberduck on the Mac to FTP.

If you're using Cyberduck, here's what you do. Go to quick connection. Select SFTP. For server number, type in the IP address you got from your Pi. The default username is "pi" and the default password is "raspberry."

Then navigate to RetroPie / Roms. Transfer ROMs according to folders. Bryan also moved all of his unwanted emulators to a new folder he created called "Unused." When you fire up Emulation Station, you won't see the emulators in that folder.

Navigate to RetroPie / Configs / all
Then find retroarch.cfg open in text editor. If you've got an SNES controller like Bryan and want to set it up just like he did, check out his configuration file here.

Step 6 Making things pretty

Go to Terminal and type in the following:
cd RetroPie-Setup
sudo ./retropie_setup.sh

Run ES-scraper. It will grab box art and game descriptions so you'll have a nicer looking menu. However, ES-scraper isn't perfect, so you can clean up any incorrect information.

To correct your library, use Cyberduck again to download the gameslist.xml file located in the Rom folder. Then you can open the XML file and edit titles,descriptions and images.

Connect with us!

Don't forget to check out our large library of projects on this site. If you want to search for a topic, try this custom search engine.

Connect with us
- Google+ Community at gplus.to/twitkh
- Tweet at us using the hashtag #twitkh
- Email us at knowhow@twit.tv

Sponsors: