![Bought a bunch of old Motorola speaker/mics at a secondhand shop. Tore one open to find a circuit board inside. How does this work? I have never seen a PCB like this Bought a bunch of old Motorola speaker/mics at a secondhand shop. Tore one open to find a circuit board inside. How does this work? I have never seen a PCB like this](https://i.redd.it/bought-a-bunch-of-old-motorola-speaker-mics-at-a-secondhand-v0-50jp0ymh441b1.jpg?width=4624&format=pjpg&auto=webp&s=98c17604a750998890e51f15d0f61fbb6b5c7e39)
Bought a bunch of old Motorola speaker/mics at a secondhand shop. Tore one open to find a circuit board inside. How does this work? I have never seen a PCB like this
![File:Vintage Motorola Transistor Radio With Leather Case, Model X23E, AM Band, 6 Transistors, Made In USA, Circa 1961 (48978106727).jpg - Wikimedia Commons File:Vintage Motorola Transistor Radio With Leather Case, Model X23E, AM Band, 6 Transistors, Made In USA, Circa 1961 (48978106727).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/c/c8/Vintage_Motorola_Transistor_Radio_With_Leather_Case%2C_Model_X23E%2C_AM_Band%2C_6_Transistors%2C_Made_In_USA%2C_Circa_1961_%2848978106727%29.jpg)
File:Vintage Motorola Transistor Radio With Leather Case, Model X23E, AM Band, 6 Transistors, Made In USA, Circa 1961 (48978106727).jpg - Wikimedia Commons
![Lot of 7 vintage motorola cp200 and Cp 125 two way radio - electronics - by owner - sale - craigslist Lot of 7 vintage motorola cp200 and Cp 125 two way radio - electronics - by owner - sale - craigslist](https://images.craigslist.org/00v0v_kgVz2te69lc_0hS0t2_600x450.jpg)