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Date: Sun, 6 Feb 2011 11:44:56 +0000
Message-ID: <AANLkTikxw3K=ixMb1EnfqHCv6MaFbHHx0h7srD4o1_5P@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org, sub9khz@yahoogroups.com
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Subject: LF: Re: Simple PIC based DDS for VLF
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Or just the description without having to wade through the complete zip
file...
http://www.g4jnt.com/PIC_DDS.pdf


'JNT



On 5 February 2011 18:57, Andy Talbot <andy.g4jnt@gmail.com> wrote:

> 9kHz OPs may be interested in this DDS suitable for audio/ VLF using just a
> 16F628 PIC, , R-2R ladder and op-amp filter.   It can generate frequencies
> up to about 40kHz with typical DDS high resolution / frequency steps,
> (higher if you overclock the device)  offers two-tone FSK operation by
> toggling a single input line (ideal for DFCW),  The two frequencies are
> stored in non-volatile memory and are user-programmable from an RS232
> interface using ASCII text based commands.
>
> See www.g4jnt.com/PIC_DDS.zip for full details.
>
> Andy
> www.g4jnt.com
>
>
>

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<div>Or just the description without having to wade through the complete=
 zip file...</div>
<div><a href=3D"http://www.g4jnt.com/PIC_DDS.pdf">http://www.g4jnt.com/PIC=
_DDS.pdf</a></div>
<div>=A0</div>
<div>=A0</div>
<div>&#39;JNT</div>
<div>=A0</div>
<div><br>=A0</div>
<div class=3D"gmail_quote">On 5 February 2011 18:57, Andy Talbot <span dir=
=3D"ltr">&lt;<a href=3D"mailto:andy.g4jnt@gmail.com">andy.g4jnt@gmail.com<=
/a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div>9kHz OPs may be interested in this DDS suitable for audio/ VLF using=
 just a 16F628 PIC, , R-2R ladder and op-amp filter.=A0=A0 It can generate=
 frequencies up to about 40kHz with typical DDS high resolution / frequenc=
y steps, (higher if you overclock the device) =A0offers two-tone FSK opera=
tion by toggling a single input line=A0(ideal for DFCW),=A0 The two=A0freq=
uencies are stored in non-volatile memory and are=A0user-programmable=A0fr=
om=A0an RS232 interface=A0using ASCII text based commands.</div>

<div>=A0</div>
<div>See <a href=3D"http://www.g4jnt.com/PIC_DDS.zip" target=3D"_blank">ww=
w.g4jnt.com/PIC_DDS.zip</a> for=A0full details.</div>
<div>=A0</div>
<div>Andy</div>
<div><a href=3D"http://www.g4jnt.com/" target=3D"_blank">www.g4jnt.com</a>=
</div>
<div>=A0</div>
<div>=A0</div></blockquote></div><br>

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