221: Difference between revisions

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==Internals==
==Internals==
The 221 has a switching power supply and built-in rechargeable batteries (which area maintenance issue).   
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]].   
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