Build an op amp with three discrete transistors

Build an op amp with three discrete transistors

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by Lyle Russell Williams:

You can use three discrete transistors to build an operational amplifier with an open-loop gain greater than 1 million (Figure 1). You bias the output at approximately one-half the supply voltage using the combined voltage drops across zener diode D1, the emitter-base voltage of input transistor Q1, and the 1V drop across 1-MΩ feedback resistor R2.

Build an op amp with three discrete transistors – [Link]

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1 Responses

  • Audioguru
    16 September, 2015 at 5:44 pm

    It is an inverting amplifier, not an opamp.
    An opamp has a differential input, a very high input impedance and a very low output impedance. This amplifier does not have these qualities.

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