This tiny telephone receiver circuit is easy to build and is an excellent project for learning the fundamentals of how a telephone handset works.
The FK310 is very efficient and needs no external power supply. The kit comes with a miniature earphone bud and on-board microphone.
Power Supply : Not required
PCB Dimensions: 65.8mm X 43.7mm X 15mm (2.59 X 1.72 X 0.6 in)
Recommended housing : FB03