An extremely simple and low cost Sine/Square wave generator based on the Analog Devices AD9835 Direct Digital Synthesis (DDS) Generator chip. The frequency can be set for any frequency from 1Hz to 10MHz in 1Hz resolution steps! All this with three push buttons and a novel "sliding window" LED display. The controller chip is a Microchip PIC16F628. There is no wiring, and the PCB fits into a standard UB3 Jiffy Box.

Read the complete Project Article in HTML format.

The Schematic Diagram in GIF format.

The Front Component Overlay in GIF format.

The Back Component Overlay in GIF format.

The Front Panel in ZIPed PDF format

The Front Panel in ZIPed EPS format

STOCK UPDATE:

I have ran out of kits and only have blank PCBs left. Please EMAIL david AT alternatezone DOT com for a price. I have no plans to restock this kit.

Unfortunately I will not be selling the AD9835 chip, it is available in stock from Farnell Components for $33.79+GST, Cat# 334-3042

Other suitable components are:

50MHz XTAL Osc - Farnell# 788-533
R/A RCA Socket - Jaycar PS-0279
RCA to BNC daptor - Jaycar PA-3655

There are no suppliers selling a complete kit at present, this is all that is available for the foreseable future.

The PCB supplied is professional quality solder masked and silk screened. It is however the Rev1 board as shown in the Silicon Chip article, this means that R1, R3, C13 have to be retrofitted on the underside of the board as shown in the article.

The modifications are as follows:

- Cut the track from pin 1 U5 to C12
- Add C13 from pin 1 U5 to pin 6 U1 (positive to U5 if your cap is polarised)
- Add R1 and R3 from pin 1 U5 to GND and Vcc respectively

- Please note that C15 and C14 are marked with incorrect polarity on the supplied Rev 1.0 board.

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