Telephone busy indication circuit
Source: InternetPublisher:红水杯 Keywords: LED BSP Updated: 2020/03/11
Telephone busy indication circuit
Component BOM table:
R1 3.3K 1/4W Resistor
R2 33K 1/4W Resistor
R3 56K 1/4W Resistor
R4 22K 1/4W Resistor
R5 4.7K 1/4W Resistor
Q1, Q2 2N3392 NPN Transistor
BR1 1.5 Amp 250 PIV Bridge Rectifier
LED 1 Red LED
LED2 Green LED
MISC Wire, Case, Phone Cord
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