221: Difference between revisions
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221-2.jpg|221 on top of 565 | 221-2.jpg|221 on top of 565 | ||
Tek 221 trace2.jpg | Tek 221 trace2.jpg | ||
IBM Variant | 221 IBM Version.jpg|IBM Variant | ||
Single Sweep | 221 Single_Sweep.jpg| Single Sweep Option | ||
</gallery> | </gallery> | ||
[[Category:200 series scopes]] | [[Category:200 series scopes]] | ||
Revision as of 05:48, 11 June 2019
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.
A version made for IBM has a single-sweep function not found on the standard 221.
Pictures
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Front
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Panel of 221
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Probe of 221
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221 with orginal bag
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221 on top of 565
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IBM Variant
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Single Sweep Option
