Loading ...
Loading ...
Loading ...
32
+
Project #69
High Sensitivity Voice
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.
Project #71
Very Loud Doorbell
Project #72
Doorbell with Button
Project #73
Darkness Announcer
Project #74
Musical Motion Detector
Replace the 6V lamp (L2) with the antenna coil (A1), the sound is louder now.
Replace the antenna coil (A1) with the speaker (SP), the sound is now louder.
Replace the microphone (X1) with the press switch (S2) and wait until the
music stops. Now you have to push the press the switch 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 #70
Louder Doorbell
Project #75
This circuit will make the fan spin faster and y higher than the
preceding circuit, making it easy to lose your fan.
Push the press switch (S2) until the motor reaches full speed, then
release it. The fan blade should rise and oat through the air like a
ying saucer. Be careful not to look directly down on fan blade when it
is spinning.
Super Flying Saucer
OBJECTIVE: To make the fan blade y.
Loading ...
Loading ...
Loading ...