Re: this project, newbie
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I finally got around to making some measurements here on my collection of the Chinese DDS module (7 in total brought from three suppliers). All ran okay at 3.3V.
Average current draw (DDS only) while sweeping at 3.3V was 93mA. At 5V it was 136mA. Best performers were the blue modules which have small 125MHz oscillators. The green modules I have, had both the largest current draw and were off frequency the most (400Hz at 10MHz) against 160Hz average for the blue modules. All are useable of course.
My test setup uses a PICAXE 18M2 to drive the DDS modules. I am worried about leakage from an Arduino arrangement interfering with minimum signal levels. When I get the time I want to package the DDS and 18M2 inside a shielded box using a serial connection for an interface. Probably not the way to go but still fun to play with.
"Speaking of power requirements, here are some measurements I made a couple of weeks ago. Arduino and DDS powered from 12 V supply, DDS running on 3.3V regulated
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