See Learning Electronics Book 2!
A
handy Piece of test equipment for all sorts of applications.
Like a signal
injector for radios and TV's, and testing digital circuits by providing a clock
pulse at one of the 6 frequencies. It can also check audio amplifiers for gain
and distortion
A simple 555 test oscillator with 6 presetable
frequencies.
Selectable frequencies are 1Hz, 10Hz, 100Hz, 1kHz, 10kHz and
100kHz
Board dimensions: 1.1in x
2.1in.
1 Page article.