1960's style guerilla homebrew 6 Hz - 2 MHz function generator with 4 transistors

A very neat construction project from Miroslav Cika. Miroslav's project generates square waves up to 2.22 MHz and pulses with a variable duty cycle from 1-49% and 51-99%. Output is either 5 Volt TTL levels or an adjustable 0-3.38 level. 

This piece of test equipment could be very useful for designing and debugging digital electronics. The design is flexible enough that it can be modified to suit your needs.

Click the following link to go to his page describing the build process : http://www.arthropodsystems.com/SquareWaveGenerator/SquareWaveGenerator.html

Front view showing controls

Circuit diagram, just four transistors.

Output at 1Mhz on scope