LFO...Again.

[PenPen]

Ok, I've been trying to get this LFO working. To work with I tried out variations on the EA Trem LFO. Problem is I can't get this thing to occillate. I finally tried modelling it in LTSpice and still I'm not getting occillations. Here's my screen shot. If there's not enough info here to go on I'll try to clarify, but I've tried several values for the resistors in this sim. No real changes. The voltage lines are as follows, blue is reference from V1, grey is the voltage from between D1 and R4, and Yellow is measured between R3 and R2. I though I would be seeing voltage variances, but I don't.

Can anyone help?


Spice screen shot FULLSIZE

[Seljer]

I belive in LTspice, or at least the version i have installed, m mean milli, not mega. Try writing 2.2Meg or 2200k

or if that doesn't work, try setting the simulation time longer, sometimes those LFOs need some time to get going

[PenPen]

Crap, I can't edit the post and it looks like I fudged the link to the full size.

Fullsize image

Thanks for the suggestion, I'll try that out.

[PenPen]

Thanks. A slight tweak to the schem, plus changing the 2m2 to 2200k did it. Thanks for pointing that out.