An old computer (that has a soundcard with a microphone input) to use with a free program called Audacity (for an internet radio station you could use shoutcast and icecast also) installed. Yes, we acquired an old computer from a local user group for free. People (obviously Microsoft users) thought It was worthless. Linux makes computer equipment more valuable.
$ sudo apt-get install audacity pavucontrol
Step 1: Simple Microphone.
Microphone: (Any good piezo buzzer should work.)
We tried several piezo buzzers and found the larger ones work better. I also plan to try some old speakers also. The real tiny piezo buzzers from old motherboards need a preamp (they are not loud enough and need additional electronics to help them work better). One interesting thing is that you can also use the piezo mikes as speakers in a pinch. I was able to use the piezo buzzer as a mike from https://www.instructables.com/id/Yet-another-amplified-acoustical-guitar/ without any preamp into my sound card. It needs a preamp. In fact, all I did was sing (if you want to call it that?) into the guitar.
Note: a lot of the dollar stores will sell a microphone for at or under a dollar. But if you do not have access to one this is an alternative.
Step 2: Simple Amplifier 1
Step 3: Simple Amp 2
Step 4: Simple Amplifier 3
(bc547b = nte123ap)
Step 5: Simple Amplifier 4
Step 6: Simple Amplifier 5
Also pictured is the pinout for the lm386
Step 7: Simple Mixer 1
Step 8: Simple Mixer 2
Step 9: Putting It Together.
mike > preamp >
mike > preamp > mixer > soundcard.
mike > preamp >
For purposes of this demonstration we will only be using two amps and one mixer. (I know nothing about electronics.)
Step 10: Using Audacity
You can get Audacity from: http://audacity.sourceforge.net/ for the most popular platforms. On Linux it is usually in the distributions set of downloadable software. (i.e. sudo apt-get install audacity or sudo yum install audacity).
www.archive.org has let some people host (i.e. allow everyone on the internet to access the podcasts) their podcasts on their site. See the site for more details.
Step 11: Computer Controlled Input Switcher.
If you have a podcast it would be nice to be able to add or remove inputs. Can be very easy to do with the computer. remotely. The Rpi or an ethernet enabled arduino would be good for this. You will need cmos 4066 chips and 5 stereo input jacks to complete the hardware. More details later.