电话占线指示电路

电话占线指示电路

元件BOM表：

R1 3.3K 1/4 W Resistor

R2 33K 1/4 W Resistor

R3 56K 1/4 W Resistor

R4 22K 1/4 W Resistor

R5 4.7K 1/4 W Resistor

Q1, Q2 2N3392 NPN Transistor

BR1 1.5 Amp 250 PIV Bridge Rectifier

LED1 Red LED

LED2 Green LED

MISC Wire, Case, Phone Cord