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S-53: Difference between revisions
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The trigger-out signal is 1V into 50 ohms, with 600mV/ns slew rate. | The trigger-out signal is 1V into 50 ohms, with 600mV/ns slew rate. | ||
The signal first passes through a compensated NPN differential amplifier, Q10 and Q12, which provides | |||
an adjustable trigger offset voltage and trigger polarity selection. Switching diodes CR6 and CR8 are | |||
used for selecting the trigger polarity. The differential amplifier (i.e., phase splitter) generates | |||
both phases, inverted and noninverted. Depending on the position of the trigger polarity switch one | |||
or the other of the phases is shunted by 200 ohm resistor. The two signals are buffered by common-base | |||
amplifiers Q20 and Q22, whose collector currents are summed. R25 sets up a bias current on trigger | |||
tunnel diode CR25. The extra current from Q20 or Q22 pushes CR25 over its peak current, and it switches | |||
to the high voltage state. | |||
* [http://w140.com/tek_s53.pdf Tektronix S-53 Manual (bad) (PDF)] | * [http://w140.com/tek_s53.pdf Tektronix S-53 Manual (bad text, good schematic) (PDF)] | ||
* [http://w140.com/tek_s53_good.pdf Tektronix S-53 Manual (good) (PDF)] | * [http://w140.com/tek_s53_good.pdf Tektronix S-53 Manual (good text, bad schematic) (PDF)] | ||
* [http://w140.com/tek_s53_sch.png Tektronix S-53 Schematic (PNG)] | |||
<gallery> | <gallery> | ||
Image:Tek s-53.jpg | Image:Tek s-53.jpg|Front | ||
Image:Tek s53 sch.png|Schematic | |||
</gallery> | </gallery> | ||