[bct] Re: Build a budget parabolic mic

• From: Tim Cross <tcross@xxxxxxxxxxxxxxx>
• To: blindcooltech@xxxxxxxxxxxxx
• Date: Tue, 28 Feb 2006 23:28:49 +1100

```Basic description of a parabolic microphone.

1. You have a parabolic dish, which is smooth (most I've seen are made
out of plastic). From memory the diameter of the one I used was about
1 ft. The depth of the dish is a function of its diameter - there
would be a mathematical formula for calculating this. Essentially, the
dish should have a curve which reflects the sound waves entering the
dish to a focus point near the middle but a few inches out from the
centre.

2. You have some sort of mounting arm which holds the microphone in
the middle of the dish.

3. The microphone is placed in the mount so that it points inwards,
towards the centre of the dish. The one I use to use had a marker
on the mounting arm which indicated the focal point - this is where
you would position the microphone pickup.

From memory, the parabolic microphone I used was from either Sony or
Panasonic. However, it was over 20 years ago and my memory isn't

sorry, what was I saying?

Tim

Don Ball writes:
> we need to get rob or some one to look at this picture and tell us how to
> design it in an email or podcast. Neal does the mic go on the out side of
> the dish or on the under side?
> ----- Original Message -----
> From: "Debee Norling" <debee@xxxxxxxx>
> To: <blindcooltech@xxxxxxxxxxxxx>
> Sent: Sunday, February 26, 2006 9:29 PM
> Subject: [bct] Build a budget parabolic mic
>
>
> http://www.bambooturtle.us/ParabolicMicrophone.html
>
> shows how to use dollar store items to build a parabolic mic. The parabolic
> dish is an umbrella hat -- Ed Potter used to sell them. Bet he never thought
> of turning one into a parabolic mic.
>
> You'll want to have someone on hand to describe the pictures but the
> construction looks very easy.
>
> --Debee
>
>
>
>

```