Timer with alarm

Posted on Jun 2, 2012

The circuit has two ranges: 10 sees to 5 mins and 1 min to 80 mins. It can be powered by a 9-V battery. With the LED connected as shown a reasonable frequency of flashing occurs throughout the range of operation.

Timer with alarm
Click here to download the full size of the above Circuit.

This circuit is reset when S2 is closed.

Leave Comment

characters left:

New Circuits



Popular Circuits

Hi-Fi power amplifier with MJ3001 and MJ2501
555 LED flasher
electronic timer with display circuit
usb powered mobile phone battery
AC Dimmer for Lamp 6.3V
h bridge using mosfet transistor pwm
DZ-2 CRV-46152 Aircraft Direction Finding Equipment
Oscillations and Regenerative Amplification using Negative Resistance
ZX-Printer Service Manual
Clock synchronization circuit diagram