Elenco Upgrade Kit SC500 to SC750 - Manual (Page 134)

Turn on the switch and adjust the variable capacitor (CV) for a radio
station, then adjust the loudness using the adjustable resistor (RV).
Use the same Winscope settings as for project PC12 (AM radio) to
view the waveform and frequency spectrum. The waveform will be
different from that in projects PC12 and PC38, because those
circuits use the power amplifier IC (U4) instead of the NPN
transistor for amplification.
Project #PC39
Transistor AM Radio PC (II)
OBJECTIVE: To show the output of an AM Radio.
-45-
Build the circuit shown. Turn on the slide switch (S1), you hear a
beep signaling that you may begin recording.
Talk into the
microphone (X1) up to 8 seconds, and then turn off the slide switch
(it also beeps after the 8 seconds expires).
Press the press switch (S2) for playback. It plays the recording you
made followed by one of three songs. If you press the press switch
before the song is over, the music will stop. You may press the
press switch several times to play all three songs.
Project #PC40
Playback & Record PC
OBJECTIVE: To show the waveforms for music and your voice.