Quantity   Component name
1 × 2.1 mm barrel jack for 9 Volt 1 Amp Wall Wart
1 × 220 ufd 25 volt Filter capacitor
1 × 4N33 opto isolator darlington
1 × 330 ohm 1/2 watt resistor Current limiting into pin 7 if voltage sample exceeds 5 volts
1 × 10 ufd capacitor
1 × 2N3904 NPN Transistor Relay drive transistor
1 × 470 ufd capacitor
2 × Phone Jack printed circuit mount Phone Line and extension Jacks
1 × Relay 5 volt SPDT AC Power switch relay to reset power to Cordless Phone Base
1 × AC Power socket Outlet to plug in Cordless Phone Power adapter
4 × 1N4002 a 100 Volt 1 Amp diode
1 × 7805 voltage regulator
1 × 9 volt DC 1 Amp wall power adapter
1 × Transformer 120 VAC to 12 VAC @ 1 Amp Used here with the secondary as a current sense transformer to sense audio on phone line
3 × 10 K ohm 1/4 watt resistor
1 × .1 ufd 100 Volt decoupling capacitor
1 × 1 K ohm 1/4 watt resistor base drive current limit for 2N3904 NPN transistor
1 × ATtiny 85 AVR microcontroller
1 × VM48 Bridge rectifier Replaces the 4 diode bridge in the Audio Detector
1 × .1 ufd 100 volt capacitor ATtiny 85 decoupling capacitor
2 × 1N5244 a 14 volt .5 watt zener diode
1 × 220 K ohm 1/4 watt resistor capacitor bleed resistor and Analog input pull down