Tom Napier formerly worked for space and high-energy physics research organizations in Europe. Since 1982, he has developed innovative electronic equipment for companies in the US. He is now an electronics consultant based in SE Pennsylvania.
BUILD A SIMPLE SYNTHESIZER
The output frequencies from audio signal generators are not always either stable or accurately specified. An alternative is Direct Digital Synthesis (DDS). This process creates the desired output from numerical samples and generates any frequency you set with crystal accuracy.