Friday, May 26, 2017

Sine, Square and Triangle function signal generator

A few days ago i did built this cheap function signal generator.
For less than 2 euro  this DIY kit provides a Sine, Square and Triangle signal.
 (You can find this kit for different prices on AliExpress.  I payed € 1,69 , when writing this blogpost i noticed the price has droped to € 1,61 at the same seller. )
Search for it with keywords ICL8038 Monolithic Function Signal Generator Module DIY Kit Sine Square Triangle )
The kit is designed for a frequency range
of 50-5KHz, two bands with a switch S.
RP1 is the frequency adjustment,
RP2 on the PCB is the duty cycle adjustment and
RP3 on the PCB is a sine wave distortion adjustment.
According to the description the circuit uses 12V single power supply.
After testing it with 12 Volt i tried other input voltages. I also worked on 9 Volt so it can be easy battery powered. The Square signal is stronger than the two other signals

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