Simple Opamp Triangle-Square wave LFO

[Maneco]

Hi!
The first posted schematic is ok,except that r2 and r1 should not be the same value...r2 should be at least 1,5 times the value of r1...try 27k and 47 k respectively for r1 and r2,it will work for sure...also a decoupling capacitor in the voltage reference,10uf electro will help...

[markusw]

I did a simulation in LTSpice and the range with a 470n cap should be about 0.5 Hz to 25 Hz.
So at highest rate you should be able to hear a low frequency signal if you connect one of the ouputs via a cap to your amp. Should be pretty loud, btw 

Markus

[Maneco]

yes,the correct value is 10 uf non polarized (easily built with two 22uf in anti series)

[Transmogrifox]

http://www.interq.or.jp/japan/se-inoue/e_ckt16.htm
http://www.interq.or.jp/japan/se-inoue/e_ckt16_2.htm

http://www.interq.or.jp/japan/se-inoue/gif/ckt16_2.gif





I have used this for an LFO before by changing the values of R1 and C1

[slacker]

Here's another one for you to try. Depending on how you look at it it's either a simplified tremulous lune LFO or a modified phase45 LFO.



You might need to change the value of the depth pot on the LED, I guessed at its value, because I haven't actually tried it. The rest of the circuit works fine, it's on my breadboard at the minute.

[Sweetalk]

Thanks a lot for all the replys!!!, I will try the circuits that you post and tell you my experiences. Surely I make a PCB Layout for them.

[bms19]

I just discovered now this topic, Is it a simple way to lower the Hertz response? I'm looking for 0.5 Hz or even 0.3 Hz...
Cheers
Benoit

[ElectricDruid]

I just discovered now this topic, Is it a simple way to lower the Hertz response? I'm looking for 0.5 Hz or even 0.3 Hz...
Cheers
Benoit

Increase the capacitor value. Doubling it should push the whole range down an octave, so adjust to taste.