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(Serial Number Prefixes: 2403A-3001A)
input state (QlO, Q15) with current source Qll, two current gain stages (Q9, Q14 and QS,
provides rear-panel X and Y DISPLAY OUTPUTS.
Current Amplifier (B)
The Current Amplifier transforms an input voltage change to a differential current change at
the collectors of QlO and Q15. This change is amplified in the following current gain stages
CRT trace deflection limits.
The collectors of QS and Q13 are virtual-ground, current-summing junctions of the output
amplifiers. When a signal is applied so as to increase the current in QS (decrease in Q13)
Q5 conducts more, turning off Q2 and causing the output (collector of Q2) to rise. Current
feedback through R29 supplies the increase in current required by QS. The analogous
operation, with inverted polarity, occurs in the other output amplifier.
Current to Voltage Amplifiers (C) (D)
Emitter followers Q7 and Q12 are feedforward amplifiers, coupling the drive signal directly to
the bases of Ql and Q4, thus improving the frequency response. Trimmer capacitors Cl0 and
minimum overshoot and equal risetimes (~70 ns).
An input signal of 0 V to 2 V peak will cause a beam deflection equal to the length of the
graticule lines.
Display Output (A)
Display output amplifier Ul provides a 1 V maximum rear-panel signal to the X and Y
DISPLAY OUTPUTS.
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