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The Tektronix Type 221 is a miniature | {{Oscilloscope Sidebar | | ||
title=Tektronix 221 | | |||
summary=5 MHz miniature analog scope | | |||
image=Tek 221 1.jpg | | |||
caption=Tektronix 221 | | |||
years=1973 – ? | | |||
manuals= | |||
* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)] | |||
}} | |||
The Tektronix Type 221 is a miniature 5 MHz analog scope [[introduced in 1973]]. | |||
It has a switching power supply and built-in rechargeable batteries (which are | It 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]] 1mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier that drives the | [[1N3713]] 1mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier | ||
CRT plates is two opamps made from discrete transistors. One drives the top deflection | that drives the CRT plates is two opamps made from discrete transistors. One | ||
plate and the other drives the bottom plate. | drives the top deflection plate and the other drives the bottom plate. | ||
==Specifications== | |||
==Pictures== | |||
<gallery> | <gallery> | ||
| Line 16: | Line 28: | ||
Image:221-2.jpg|221 on top of 565 | Image:221-2.jpg|221 on top of 565 | ||
</gallery> | </gallery> | ||
[[Category:200 series scopes]] | |||
[[Category:Specifications needed]] | |||