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The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | ||
{{MissingSpecs}} | |||
==Internals== | |||
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 | a maintenance issue). It has a transformer-coupled trigger circuit which | ||
would seem to preclude DC level-based triggering. The trigger circuit uses a | would seem to preclude DC level-based triggering. The trigger circuit uses a | ||
[[1N3713]] | [[1N3713]] 1 mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier | ||
that drives the CRT plates is two opamps made from discrete transistors. One | that drives the CRT plates is two opamps made from discrete transistors. One | ||
drives the top deflection plate and the other drives the bottom plate. | drives the top deflection plate and the other drives the bottom plate. | ||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 221 1.jpg|Front | |||
Tek 221 right.jpg|Panel of 221 | |||
Tek 221 probe.jpg|Probe of 221 | |||
221-5.jpg|221 with orginal bag | |||
221-2.jpg|221 on top of 565 | |||
</gallery> | </gallery> | ||
[[Category:200 series scopes]] | [[Category:200 series scopes]] | ||
Revision as of 11:54, 28 August 2017
The Tektronix Type 221 is a miniature 5 MHz analog scope introduced in 1973.
Key Specifications
- please add
Internals
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. The trigger circuit uses a 1N3713 1 mA tunnel diode. The vertical output amplifier that drives the CRT plates is two opamps made from discrete transistors. One drives the top deflection plate and the other drives the bottom plate.
Pictures
-
Front
-
Panel of 221
-
Probe of 221
-
221 with orginal bag
-
221 on top of 565
