Darlington Amplifier Used in the output stage power transistors TIP142 and TIP147 4 can be found in all parts 8Ω 145W 4Ω speaker with market power can give 275W two-channel stereo whether you can use the same circuit two.... Electronics Projects, 145W Balanced Darlington Transistor Amplifier TIP142 TIP147 "audio amplifier circuits, transistor amplifier, " Date 2019/08/01