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221: Difference between revisions
remove nonsense about transformer coupled input, its the gate of JFET Q132A wihch is the input, and yes there is DC coupling on this scope
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(remove nonsense about transformer coupled input, its the gate of JFET Q132A wihch is the input, and yes there is DC coupling on this scope) |
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==Internals== | ==Internals== | ||
The 221 has a switching power supply and built-in rechargeable batteries (which are a maintenance issue). | The 221 has a switching power supply and built-in rechargeable batteries (which are a maintenance issue). | ||
The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. | The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. | ||
The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. | The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. | ||