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| To: | [email protected], [email protected] |
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| Subject: | LF: Simple PIC based DDS for VLF |
| From: | Andy Talbot <[email protected]> |
| Date: | Sat, 5 Feb 2011 18:57:34 +0000 |
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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
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