Super simple dual waveform LFO

[ExpAnonColin]

Edited for content.

[Ansil]

hey collin  question what is the aprox freq that it is pumpin out now??

[drew]

Oh, so it's *yours* after you can't get a schematic you found to work for weeks, then redraw it and put your name on it.

In that case, I'll be right back with "Drew's Awesome LFO Circuit".


drew
www.toothpastefordinner.com

[smoguzbenjamin]

Oh c'mon drew. Give the man a break, he's happy for getting his thingy working. Who says he didn't design it?

[ExpAnonColin]

Oh, so it's *yours* after you can't get a schematic you found to work for weeks, then redraw it and put your name on it.

In that case, I'll be right back with "Drew's Awesome LFO Circuit".


drew
www.toothpastefordinner.com

lighten up.

The reason I drew it was to prevent everyone from making the same mistakes as I did.  I added a Vb schematic because I know some people who might want to build it wouldn't know how to make the Vb.  I added pots where they should be for the various functions of the circuit.  I'm going going to claim to be the invetor of the Schmidt Trigger, I was simply calling it "Colin's", because I wanted to put the tweaks onto it so that it fit our applications better.  I did say in my post, "thank you guys for helping me debug this", and I truly admit it took me way too long to get it working.

I edited the name.

-Colin

[B Tremblay]

...I was simply calling it "Colin's", because I wanted to put the tweaks onto it so that it fit our applications better...

Crediting the source of the original circuit and re-phrasing the text to reflect your modifications may prevent confusion regarding ownership.

[ExpAnonColin]

There, I fixed it.  Sorry if I insulted Schmidt.

-Colin

[ExpAnonColin]

hey collin  question what is the aprox freq that it is pumpin out now??

That depends on the cap value and the values you have between 2 and 7.  The one here has good values for much slower things, like tremolo.  Try .1uf for more of an audio-range oscillator.  The frequency is determinted by f=(1/(4 x capacitor value x resistor from pins 2 to 7))(resistor from pins 5 to 7/resistor from pins 1 to 5).

I added the Frequency onto the schematic and made it a bit bigger for easier reading.

-Colin

[Boofhead]

The 1uF cap on IC1 should be non-polar.

[ExpAnonColin]

The 1uF cap on IC1 should be non-polar.

It works perfectly as drawn.

-Colin

[B Tremblay]

When I suggested crediting the source of the original circuit, I was referring to the origin website for the schematic you included within this thread: http://diystompboxes.com/sboxforum/viewtopic.php?t=17750&start=0

[Boofhead]

It works perfectly as drawn.

That doesn't mean it's correct.  The electrolytic cap is subject to reverse bias conditions, not a good practice.

Look at the LFO's on the boss BF2 and CE2, or any other LFO like this, non-polars are always used.  The BF2 uses two eledtrolytics to form a non-polar cap.

[ExpAnonColin]

It works perfectly as drawn.

That doesn't mean it's correct.  The electrolytic cap is subject to reverse bias conditions, not a good practice.

Look at the LFO's on the boss BF2 and CE2, or any other LFO like this, non-polars are always used.  The BF2 uses two eledtrolytics to form a non-polar cap.

Interesting... I didn't realize that.  Well then, let me change it around a bit... I was just suggesting the higher value because it was hard to get good lower speeds with good pot response with lower value capacitors.

I fixed the schem.  Thanks for catching that

-Colin

[ExpAnonColin]

When I suggested crediting the source of the original circuit, I was referring to the origin website for the schematic you included within this thread: http://diystompboxes.com/sboxforum/viewtopic.php?t=17750&start=0

Yep, it's been referred to in the thread

-Colin

[Peter Snowberg]

Yep, it's been referred to in the thread

-Colin

This is where the breakdown seems to be happening. The original site, http://www.interq.or.jp/japan/se-inoue/ should be noted on the schematic. I didn't even see it listed in that thread.

Since you added a blend control and made it single ended, I don't have an issue with you adding your name if you want so long as the original is credited. The blend turns it into a different animal. The single supply is just housekeeping for the method.

Take care,
-Peter

[moosapotamus]

Oh, so it's *yours* after you can't get a schematic you found to work for weeks, then redraw it and put your name on it.

In that case, I'll be right back with "Drew's Awesome LFO Circuit".


drew
www.toothpastefordinner.com

Are you sure your name isn't Dick?

~ Charlie

[Boofhead]

I don't undertsand the issue here with the Japanese site.  I couldn't find that LFO pic on there.

As far as the schematic goes I doubt it's worth having to quote the original designer because LFO's of this type are very wide-spread- they appear on many sites and in many effects.  If it's a direct take then it would be a courtesy to quote the original.

[mattv]

you sure your name isn't Dick?
~ Charlie

Good to see you, Charlie!  

[Ansil]

Collin its a right of passage man.  dont' fret it.  everyonce in awhile someone wants you to eat a turd.  look in the archives  almost everyone here has had to do so.

[smoguzbenjamin]

oh god, not another ethics topic  :roll: