Low-volts alarm


Posted on Jul 8, 2012

This inexpensive dc supply-voltage monitor sounds a warning when the voltage falls below a preset value. It is ideal for monitoring rechargeable batteries since it draws only a few microamperes when not sounding. The voltage at which the alarm sounds is determined by the zener diode. When the voltage falls below the zener voltage, the alarm sounds.


Low-volts alarm
Click here to download the full size of the above Circuit.

The alarm tone is determined by the RC time constant of the 39 k resistor and 0.01 mf capacitor.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

7 MHz VFO
Speed regulator for dc motors
Sound-Level Meter
Build a fully featured Arduino Thermostat
5 Watt Class-A Audio Amplifier Circuit diagram
High-pressure direct current power supply scheme of the new low ripple
ic lm2917 frequency to voltage
Light Detector
interfacing spi adc with spartan 6 fpga
Robot Tutorials power regulation
DC MOTOR SPEED CONTROL



Top