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Uses a RF bypassed current mirror Q1,Q2 for AM detection. Q3,Q4 is a cascode RF amplifier. Q4 is biased in an allowable way but a way that is only suitable for small signals. The base emitter voltage is about 0.6 volts as is the collector emitter voltage which is just enough for a few 10's of millivolt signal at the collector while removing a lot of biasing components.

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Blinking LED circuit using negative resistance region of most NPN transistors.

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Meissner oscillator circuit.

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Noise generator circuit. You could replace ZD1 with reverse biased transistor emitter base junction.

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Simple oscillator circuit.

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Simple moderate impedance antenna idea.