Bipolar transistor and radar: what they have in common

1. Step 1. Bipolar transistor — uses — P–n junction. Two p–n junctions.
2. Step 2. P–n junction — is used in — Diode. A semiconductor diode is a p–n junction.
3. Step 3. Diode — is part of — Crystal radio. A crystal detector is a diode.
4. Step 4. Crystal radio — has part — Antenna. An antenna.
5. Step 5. Antenna — is part of — Radar. An antenna emits and receives.

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