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Later timing plug-ins like the [[5T3]] include built-in synchronizing circuits that eliminate the need for the countdown units such as the 280. | Later timing plug-ins like the [[5T3]] include built-in synchronizing circuits that eliminate the need for the countdown units such as the 280. | ||
Signal connections on the 280 use [[GR-874 connector]]s. The trigger circuit is built around a 50 mA [[tunnel diode]]. | |||
==Manuals== | ==Manuals== |