전자제작집 모음

 

https://archive.org/details/electronic_circuits_collection/%EC%A0%84%EC%9E%90%EC%A0%9C%EC%9E%91%EC%A7%91_01%EC%A7%91/page/n1/mode/2up?view=theater

 

 

 

https://archive.org/details/@radiomo