Micronta 22-025 - Page 3

This Checker can also be used for selecting transistors with the
same characteristics by reading settings of the BASE CURRENT
CONTROL and comparing them. With two transistors of the
same type, the one having the higher BASE CURRENT CON-
TROL reading has the higher gain. Also the brightness of LED
Indicator shows the magnitude of the output signal, and can be
adjusted with the BASE CURRENT CONTROL knob.
You can also check transistors with little collector current by
connecting an AC Voltmeter or Oscilloscope to the OUTPUT
Terminals.
The OUTPUT Terminals can be used for the following purposes:
1. As output terminals for amplified signals.
2. For graphic representation of waveforms (when connected to
an Oscilloscope).
3. As a signal injector; in this case connect to a speaker via a
capacitor (about 0.14 F). If you don’t hear a sound, or it is
very weak, try disconnecting the capacitor and connect the
speaker directly to the OUTPUT Terminals. (Under this condi-
tion the LED may go out due to the extra load of the speaker
— this is normal and occurs only when using the Checker in
this special signal tracer application.)
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4. As a continuity tester; in this case try the following:
1) Connect any good transistor to appropriate Clips or socket
with nothing connected to the OUTPUT Terminals.
2) Rotate the BASE CURRENT CONTROL knob toward MIN
(clockwise) and note where oscillation just stops (LED
begins to blinking).