not tested and no layout - but seems good

[bernte_one]

hello,

i hope someone can handle this and work out a layout
TD3DXM-1.00.pdf

[liudengyuan]

This circuit have done before, a single power supply, the effect is very good, too many places to be adjusted, change any of the parameters, you need to re-adjust, there is no applicable performance, detection distance is very short, do not spend your time and energy.

[dbanner]

The chip could be and is most likely the CD4060. The other thing could be a 220Khz glass encased crystal oscillator with internal cap to make it oscillate. Don't see any small pico caps nearby.