Elenco Upgrade Kit SC100 to SC750 - Manual (Page 21)

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Project #139
Project #141
Very Loud
Doorbell
OBJECTIVE: To build a very
loud, highly-sensitive, voice-
activated doorbell.
Replace the antenna coil (A1)
with the speaker (SP), the sound
is much louder now.
OBJECTIVE: To build a press-
activated doorbell.
Project #143
Darkness
Announcer
OBJECTIVE: To play music
when it gets dark. OBJECTIVE: To detect when
someone spins the motor.
Project #142
Doorbell
with Button
Replace the microphone (X1)
with the press switch (S2) and
wait until the music stops. Now
you have to press the slide switch
(S1) to activate the music, just
like the doorbell on your house.
Replace the press switch (S2)
with the photoresistor (RP) and
wait until the sound stops. If you
cover the photoresistor now the
music will play once, signaling
that it has gotten dark. If the
speaker (SP) is too loud then you
may replace it with the antenna
coil (A1).
Replace the photoresistor (RP)
with the motor (M1), oriented in
either direction. Now spinning the
motor will re-activate the music.
Project #144
Musical
Motion Detector
OBJECTIVE: To build a loud
highly sensitive voice-activated
doorbell.
Replace the 6V lamp (L2) with
the antenna coil (A1), the sound
is louder now.
Project #140
Louder
Doorbell
OBJECTIVE: To build a
highly sensitive voice-activated
doorbell.
Build the circuit and wait until the
sound stops. Clap or talk loud a
few feet away and the music
plays again. The microphone
(X1) is used here because it is
very sensitive.
High
Sensitivity
Voice Doorbell