It can be annoying to have your telephone call interrupted by someone picking up an extension phone and it can be embarrassing to accidentally pick up a line that is engaged. The low cost easy-to-build FK307 circuit has a bright LED that shows clearly when a line is picked up.
- Power Supply : 3VDC @ 10mA.
- PCB Dimensions : 38.35mm x 23.11mm x 15mm (1.51″ x 0.91″ x 0.6″)
- Recommended Housing : FB17