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and forth between its two stable voltages, which are capacitively coupled to a | and forth between its two stable voltages, which are capacitively coupled to a | ||
[[2N2501]] NPN common emitter amplifier. | [[2N2501]] NPN common emitter amplifier. | ||
The delayed trigger circuit is a [[6DJ8]] differential amplifier that | |||
compares the sweep ramp voltage with a knob-controlled | |||
DC voltage which determines the point where the delayed trigger starts. | |||
The DC voltage is made by a [[ZZ1000]] 80V reference passed through | |||
a potentiometer-variable voltage divider. | |||
When the sweep ramp exceeds the control voltage, a tunnel diode in the | |||
plate load of the differential amplifier switches state. | |||
* [http://w140.com/tek_3b1.pdf Tektronix 3B1 Manual (PDF)] | * [http://w140.com/tek_3b1.pdf Tektronix 3B1 Manual (PDF)] |