Simple LFO

Design by Ray Wilson:

Lately more students ask for an oscillator that is capable of generating real low frequencies, a so called Low Frequent Oscillator (LFO). So I made a simple and small LFO.

LFO with frequency range from 500Hz – once every miniute

If I have to look for a good design circuit related to synths, I always visit the website ‘’ with designs from Ray Wilson. Great designs! For an more extended explanation and circuit description, please check this page: The only thing part that I did not implement in my version, is the LED and the extra capacitors making the power supply ‘smooth’.

I made a real small version, since it had to be placed into a really small housing. Instead of the switches, I used two jumpers, changing the frequency-range and the waveshapes..

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