|
|
|
|
| |
 DARK DETECTOR with beep-beep-beep Alarm
This circuit detects darkness and produces a beep-beep-beep alarm. The first two transistors form a high-gain amplifier with feedback via the 4u7 to produce a low-frequency oscillator. This provides voltage for the second oscillator (across the 1k resistor) to drive a speaker.
|
|
|
|
|
|
| |
© Copyright @ 2009 Today 25 visitors (31 hits) |
|
|
|
|
|
|
|
