parabolic listning device

[rana naseem javed]

hi guys

i want to build a parabolic listning device.help me plz and send me its construction and pcb.

thanks

rana naseem javed

 

[xaccto]

this is probably exactly what you want
https://www.siliconchip.com.au/cms/A_101734/article.html

 

[flatulent]

Be aware that in many cities and countries using such a device is illegal if used for listening into human conversations. There may be exemptions such as recording bird songs in the rural areas.