A negative resistance device consisting of a rectifying p-n junction in the middle of a length of semiconducting material that has an ohmic contact at each end, used as a switching element.
- Shown on the left is an example of low cost planar unijunctions developed in the 1960s.
- The unijunction transistor, or UJT, is a three-terminal device with a single pn-junction.
- All in all, SCR's and unijunctions are probably the simplest and cheapest solutions, and appear to have no disadvantages.
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