Elenco Circuit Maker Sound Plus 200 - Manual (Page 35)

Project #63 NPN Emitter Project #62 NPN Collector
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Project #60 PNP Collector Project #61 PNP Emitter
Build the circuit and vary the
lamp (L4) brightness with
the adjustable resistor (RV),
it will be off for most of the
resistor’s range. The point
on the PNP (Q1) that the
lamp is connected to (point
E3 on the base grid) is
called the collector, hence
the name for this project.
Compare this circuit to that in
Project #60. The maximum
lamp (L4) brightness is less
here because the lamp
resistance reduces the emitter-
base current, which controls
the emitter-collector current.
The point on the PNP (Q1) that
the lamp is now connected to
(grid point C3) is called the
emitter.
Compare this circuit to that in
Project #60, it is the NPN
transistor (Q2) version and
works the same way. Which
circuit makes the lamp (L4)
brighter? (They are about the
same because both transistors
are made from the same
materials).
Compare this circuit to that in
Project #61. It is the NPN
transistor (Q2) version and
works the same way. The
same principles apply here as
in Projects #60-#62, so you
should expect it to be less
bright than Project #62 but as
bright as Project #61.
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 35