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221: Difference between revisions
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replaced manual with re-OCRed copy
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(replaced manual with re-OCRed copy) |
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|discontinued=1991 | |discontinued=1991 | ||
|manuals= | |manuals= | ||
* [[Media:070-1573-01.pdf|Tektronix 221 Manual]] (OCR) | |||
* [[Media:070-1573-01.pdf|Tektronix 221 Manual]] ( | |||
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]] | * [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]] | ||
}} | }} | ||
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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 area maintenance issue). | ||
It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. | |||
would seem to preclude DC level-based triggering. The trigger circuit uses a | The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. | ||
[[1N3713]] 1 mA [[tunnel diode]]. The vertical output amplifier | The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. | ||
that drives the CRT plates is two | |||
One drives the top deflection plate, the other the bottom plate. | One drives the top deflection plate, the other the bottom plate. | ||
The power supply in the 221 uses three transformers | The power supply in the 221 uses three transformers – [[120-0876-00]] (T633) in the line inverter, [[120-0877-00]]/[[120-0946-00]] (T623) in the base drive for the line inverter and [[120-0875-00]] (T701) in HV inverter. | ||
The 221 contains one integrated circuit, a 741 | The 221 contains one integrated circuit, a 741 op-amp that creates a virtual ground, otherwise only discrete (including dual) transistors. | ||
MOD 290A is a version of the 221 made for IBM | MOD 290A is a version of the 221 made for IBM which adds a Single Sweep function and a "Property of IBM" engraving. | ||
==Pictures== | ==Pictures== | ||