[sdiy] L(cheapo)FO

[harrybissell]

So why did you draw the schematic with the non-inverting inputs
on the top ???   :^P

well if that is my only complaint, it looks pretty good to me !
I wondered about the LEDs till I saw the 5V / 10V note. OK !!!

Is the sawtooth 2X the frequency of the triangle ???

How good is the sine output (looks good, sounds good ???)

H^) harry

Michael Ruberto wrote:

> Got in some breadboard time today. Since both of my previous synths started
> out with an LFO I felt my new one should too. My design goal was to make it
> as cheap as possible and use only the small supply of parts I had on hand.
> Unfortunately, I had to desolder many of the resistors from scrap PCBs to
> avoid running to Radio Shack.
> Anyway, this design works pretty good and has decent range and features
> considering the small parts count - just 1 IC and 2 transistors. The outputs
> are sine, triangle, square, and saw up or down. I get roughly 7V peak to
> peak from the triangle and saw outputs, 6 volts peak to peak from the sine
> output and +5V from the square.
>
> http://frankentron.freezope.org/source/diy_blue/images/LFO1_rev1.gif
>
> Enjoy!
>
> M. A. Ruberto