A short-circuited bipolar transistor forms one element of a basic attenuator circuit

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• Article «AGC amplifier features 60-dB dynamic range»
• Figure 1. A short-circuited bipolar transistor forms one element of a basic attenuator circuit
• Figure 2. A V_I characteristic shows the corresponding differential-resistance graph for a short-circuited BC337-16 transistor. (Note: The -16 denotes a sorted h_FE range of 100 < h_FE < 250.)
• Figure 3. You can assemble this AGC circuit entirely from discrete components
• Figure 4. The circuit's input-versus-output characteristic shows a 60-dB control range (upper trace) and total harmonic distortion well below 5% over the control range (lower trace)