You might want to find out instantly whether or not the mains voltage is running low before starting an important task because the load switch ON might cause an already […]
Bicycle Light and Alarm Circuit
The post illustrates a simple bicycle light circuit which can be used as a normal front/back indicator lights, and also as an emergency alarm signal such as an SOS signal. […]
Coffee Temperature Indicator Circuit
In this post we will build a circuit that can be used for identifying and alerting the user regarding the right temperature of the coffee. The LED indicators will indicator […]
Office Bell with IN/OUT Indicator Circuit
This office bell with IN/OUT indicator circuit utilizes three 7-segment, common anode displays rather than a couple of LEDs for the in/out indicator as is done commonly. As soon as […]
Battery Status Indicator Circuit using two Transistors only
Often a backyard electronic system could become imperfect as a result of a perishing battery. If the battery voltage is no more than 9V for a 12V operated system, the […]
Temperature Meter Using Digital Multimeter
Using this handy circuit, we are able to transform an ordinary transistor and a multimeter (in the VDC scale) perfectly into a digital temperature meter having a range of -30 […]