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221: Difference between revisions
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==Internals== | ==Internals== | ||
The 221 has a switching power supply and built-in rechargeable batteries (which | The 221 has a switching power supply and built-in rechargeable batteries (which are a maintenance issue). | ||
It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. | It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. | ||
The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. | The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. | ||