
NXP Semiconductors.
NPN/PNP resistor-equipped transistors; R1 = 4.7 kΩ, R2 = 4.7 kΩ

NXP Semiconductors.
NPN/NPN resistor-equipped transistors; R1 = 22 kΩ, R2 = 47 kΩ

NXP Semiconductors.
NPN/PNP resistor-equipped transistors; R1 = 47 kΩ, R2 = open

Philips Electronics
NPN/PNP resistor-equipped transistors; R1 = 47 kΩ, R2 = 22 kΩ

NXP Semiconductors.
NPN/NPN resistor-equipped transistors; R1 = 47 kΩ, R2 = open

NXP Semiconductors.
NPN/NPN resistor-equipped transistors; R1 = 2.2 kΩ, R2 = 2.2 kΩ

NXP Semiconductors.
NPN/NPN resistor-equipped transistors; R1 = 100 kΩ, R2 = 100 kΩ