[sdiy] prob with noise circuit?

[Magnus Danielson]

From: Pete <23isgood at gmail.com>
Subject: [sdiy] prob with noise circuit?
Date: Mon, 30 May 2005 13:03:47 -0700
Message-ID: <dc5946590505301303564db404 at mail.gmail.com>

Pete,

> Hey everybody. I have been trying to get this circuit to work but I
> simply don't understand why I get no sound out of it. This is out of
> Thomas Henry's "Noise Generator Cookbook" In the book he mentions to
> use a, 2n2712 for the transistor or a 2n3904. I am using a 2n3904. I
> built this basic circuit on a breadboard, and im using a 1/4" jack for
> the output, and a 15v power supply. Do I have to apply power to the
> pins of the 741? It does not specify to do so. I attached a pic of the
> circuit. Im pretty much a beginner on this stuff and trying to teach
> myself. I have rebuilt this thing a few times double checking
> everything. According to the book there should be a good amount of
> noise coming out of this thing. Is there something that I am not aware
> of that im overlooking?<br>

You ofcourse need to supply the 741 with power to its power-pins. This is
assumed, so it is not explicitly drawn in the schematic.

Good luck!

Cheers,
Magnus