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52
Project #139
AM Radio with
Transistors
OBJECTIVE: To build a complete, working AM radio with
transistor output.
When you turn on the slide switch (S1), the integrated circuit (U5)
should amplify and detect the AM radio waves. Tune the variable
capacitor (CV) to the desirable station. Set the adjustable resistor (RV)
for the best sound. The two transistors (Q1 & Q2) drive the speaker
(SP) to complete the radio. The radio will not be very loud.
Note: 5-snap wire is connected
from base grid locations G3 to G7.
Delayed Action Lamp
OBJECTIVE: To build a lamp that stays on for a while.
Turn on the slide switch (S1) and press the press switch (S2). The
lamps (L1 & L2) turn on slowly, but stay on for a while after you release
the press switch.
Project #140
Replace the lamp (L1) with the motor (M1), positive (+) side up. Be sure
to put on the fan. Turn on the slide switch (S1) and press the press switch
(S2). The fan turns on slowly but stays on for a while after you release the
press switch.
Project 141
Delayed Action Fan
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