3A74: Difference between revisions
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File:3a74 block diagram.png|Block Diagram | |||
File:3a74 switching.png|Channel Switching | |||
File:3a74 amp schem.png|Amplifier | |||
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[[Category:560 series plugins]] | [[Category:560 series plugins]] | ||
Revision as of 12:02, 16 November 2014
Template:Plugin Sidebar 2 The Tektronix Type 3A74 is a four-channel vertical plug-in introduced in 1963 for 560-series scopes. The bandwidth is DC to 2 MHz.
Key Specifications
| Bandwidth | 2 MHz |
|---|---|
| Input impedance | 1 MΩ // 47 pF |
| Deflection | 20 mV/Div to 10 V/Div in 1–2–5 sequence |
| Features |
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Internals
Each input signal passes through switchable input attenuators and then into a cathode-follower made from a 7586 Nuvistor triode. That drives a PNP differential amplifier. The output of this differential amplifier, for each of the four channels, passes through a diode-based analog signal switching network (multiplexer). The output of that multiplexer drives the output amplifier, which is part transistor, part tube. The one-hot select line signals for the multiplexer are generated by a transistor-based ring oscillator, a four-state cyclic state machine. This allows each of the input signals to be traced on the screen, one after another.
Links
Pictures
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Block Diagram
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Channel Switching
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Amplifier
