Push the button with a short press to start the timer. The Green LED lights. After 9 minutes, the Red LED starts flashing slowly. After 9 minutes, 45 seconds, the red LED starts flashing fast. After 10 minutes, the red LED lights continuously. Press the button with a short press to restart the timer. Hold the button down for 1 second to stop the timer and turn off the green LED. Uses PIC12F675. Contact Jeff for source.
Power Management ICs / Linear Voltage Regulators and LDO