Microprocessor based frequency counter up to 70MHz – Herbert Dingfelder – DL5NEG
DDS Signal Generator With AVR Sine, Square, ECG 8Mhz - Xtronic
Frequency counter
Seesii 0-22mA/4-20mA DC 0-10V Signal Generator, Mini Adjuatable Function Generator with LCD Display, Current Voltage Analog Generator: Amazon.com: Industrial & Scientific
A DDS function generator using an ATmega16 - Embedds
AD9850 Based Signal Generator at EZdenki.com
AVR frequency meter - from 1Hz to 10MHz
Audio Tone Generator using AVR Microcontroller
AVR DDS signal generator V2.0 - Do It Easy With ScienceProg
DIY - Waveform Generator using AVR Microcontroller