[sdiy] ISD voice recorder IC is NOISY!!

Kyle Stephens lightburnx at yahoo.com
Sat Nov 8 04:04:22 CET 2008

Tom Bugs did some work with an ISD1416. Lower down this page, he talks about the clicks you mentioned, and some other points:



--- On Fri, 11/7/08, peter edwards <synth at casperelectronics.com> wrote:

> From: peter edwards <synth at casperelectronics.com>
> Subject: [sdiy] ISD voice recorder IC is NOISY!!
> To: "Synth DIY" <Synth-diy at dropmix.xs4all.nl>
> Date: Friday, November 7, 2008, 4:16 PM
> Howdy,
> Has anyone here worked with the ISD voice recorder ICs??
>  They seem like they could be super useful in synth
> building but yowza the one I'm working with is noisy!!
> I have a handful of ISD1000 20 second voice recorder chips
> that I've been planning to build some modules with. I
> just bought a complete kit from velleman to get the ball
> rolling.
> This one uses the ISD1420. The kit is Velleman K8030.
> Here's the link to the official velleman page for this
> kit.
> http://www.vellemanusa.com/us/enu/product/view/?id=350622
> It's a good kit but the one BIG problem that I
> can't figure out is how noisy it is. There's a
> substantial humming over the recorded message AND you can
> hear the internal clock.
> It also makes a loud click when the message ends. I
> disconnected the mic and the noise in the recorded signal
> was just as loud. I've looked through the whole board
> for loose connections but can't find anything. ANy
> advice?
> Thanks
> -pete
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