electruid LFO from 9V battery

[served]

Hi.

I have built a Tap Tempo LFO by this schematic
http://www.electricdruid.net/images/lfo/TapCircuitV1.gif

But I have no idea how to power it.
With +12 - 12V the output was cut. Sine was not full sine and so on.

So I thought that lets use two TL7660 to double the voltage to 18 Volts (minus diode voltage drop) and then make it +18 and -18. But it also did not work as it feels like its not getting enough power.
I used TL074 for opamp.
Is threre a better way to do it?

[PRR]

> how to power it.

+/-15V to the opamp.

> Sine was not full sine and so on.

What was missing? Top? Bottom? Both?

Check values of R16 R17. Then try R16=68K or 100K.

[served]

Hi PRR,

Thanks! I will see what happens.

[darron]

I'd always prefer a low power opamp for an LFO rather than a tl07x. Not that that is your problem.

[garcho]

.

[garcho]

Here's .Mike's project with an earlier version of Tom's chip. It's not the synthy ±15V; might help. Here's the thread link

[served]

Hi.

Yes I have built the Tremolo few times and its briliant effect.
Now I would like to control some moog parameters with LFO and this LFO seemed to be the most advanced one I had seen.
So thats why I am doing it. I need some externeal control over my moog pedals and they need that -5V to +5V sweep to work full range.

[frequencycentral]

You need to look at something more like the Electric Druid TTLFO synth module, which runs on a bipolar supply and puts out +/-5V LFO. See the data sheet on his website. I even sell a PCB/PIC set for this.

[served]

Well. I am not able to stop now. I have the whole thing ready. I just can't use it, I need a PSU to power it.