TM 11-6625-539-14-3
CIRCUIT FUNCTIONING
5-1. Introduction
Circuits for Test Set, Transistor TS-1836C/U
can be divided into four functional loops: multi-
vibrator, current limiting, audio amplifier, and
switching. The multivibrator stage produces an
amplified square wave signal that is applied to the
switching circuits through coupling transformer
T1. The current limiting network is provided for
the protection of the semiconductor under test and
to limit the current to the transistor when resist-
ance tests are conducted. The audio amplifier is
used in conjunction with the F. E. T. test to pro-
vide a parallel source to operate the meter. The
switching circuit incorporates a 12-position, 9-
wafer function and a 3-position, 12-pole, 3-wafer
type polarity (FWD PNP/OFF/REV NPN)
switch.
A simplified- schematic diagram of the circuit
a. A simplified schematic diagram of the cir-
used to check the batteries in the test set is shown
in figure 5-1. With the function switch at BAT,
cuit used to calibrate for beta is shown in figure
+9 volts is fed through series resistor R32 and
however, the same principle applies for NON
meter Ml. The resistance of R32 limits the de-
and four-element devices (tetrodes) when the
flection of meter Ml to the BAT position on the
fourth lead is left open-circuited.
scale.
