Simple tone generator for audio probe

[spi]

When using an audio probe it'd be nice to generate a signal (usually I use a looper pedal, but it requires some extra steps).
I see this SMD based circuit in the shop here https://www.pedalpcb.com/product/pcb668/, but I'm more inclined to throw it on a stripboard.

Anyone have a simple schematic for a circuit that puts out a signal suitable for debugging pedals?

@Robert can you share the build doc for the above board so we can see the schematic you used?

 

[Robert]

It's just a quick and dirty 555 oscillator.

 

[jwin615]

Relaxation oscillator

But requires at least 12 vdc

Vero, reverse avalanche

A wien bridge oscillator will run on 9v. There's designs with a single opamp as well as 2 transistor designs

 

[jwin615]

I like RG Keens quick and dirty twin tee because it has multiple out level taps
Self etch layout

 

[spi]

Awesome, thanks everyone, I'll breadboard a few of these and see what works for me.