0 Battery and Load Status Indicator

This circuit is another simple led flasher, but this time its main purpose is for load and battery status indicator. This circuit is connected in parallel across the load and the led flashes in every second. These flashes will keep as aware that the load is not removed from the battery thus protecting battery from draining unintentionally. The circuit consume very low current and operate from 12V down to 6V, thus it's okay to keep it installed all the time.

schematic diagram

Part List:
R1 - 10 kilo ohms 1/4W
R2, R7 - 120 kilo ohms 1/4W
R3 - 39 kilo ohms 1/4W
R4 - 560 kilo ohms 1/4W
R5, R6, R8 - 330 ohms 1/4W
C1 - 10uF electrolytic capacitor rated 16V
C2 - 220uF electrolytic capacitor rated 16V
D1 - 1N4001 or similar diode ( i recommend use schottcky)
Q1 - 2N2222 or similar NPN transistor
Q2 - 2N3906 or similar PNP transistor
LED - red or any low power LED (see LED pinout if you forgot)

2N3906 pinout

2N2222 pinout

Other Useful Flasher:
1.5V led flasher - uses two transistor at very low input voltage
Lamp flasher by FET -  high current and power  flasher
two transistor flasher - powered from 3V to 12V with two LEDs
Led chaser - 10 led chaser that turns on one after the other