Ton Giesberts
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Transistor matcher

Based on a Labs project | October 2011 | Find it here
Transistor matcher
In symmetric preamplifiers and output amplifiers, it is highly advisable, if not imperative, to use truly complementary transistors. This means that the base-emitter voltage and the current amplification of the p-n-p and n-p-n transistors must be equal or very nearly so. The absolute values of these parameters are not that important.
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