32,948
edits
221: Difference between revisions
Jump to navigation
Jump to search
no edit summary
(New page: * [http://manoman.sqhill.com/pdf/tek-221.pdf Tektronix 221 Manual (PDF)]) |
No edit summary |
||
| Line 1: | Line 1: | ||
The Tektronix Type 221 is a miniature 5MHz analog scope [[introduced in 1973]]. | |||
It 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]] 1mA [[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. | |||
* [http://manoman.sqhill.com/pdf/tek-221.pdf Tektronix 221 Manual (PDF)] | * [http://manoman.sqhill.com/pdf/tek-221.pdf Tektronix 221 Manual (PDF)] | ||