This article is for Three LED Blinking Circuit with NPN Transistors that uses 3 NPN transistors, resistors, capacitors and a 9V battery, which works as an astable multivibrator, so it does not need any external clock signal. Instead, the circuit creates its own oscillation, because of this, the LEDs alternately flash ON and OFF at […]
Current to Voltage Converter Circuit using Op-Amp
This simple Current to Voltage Converter Circuit using Op-Amp helps convert small input current into easy measurable voltage output. This circuit is very useful to measure current from sensors like photodiodes, LDR modules and other low current devices, the main work of this circuit is to change input current into proportional voltage, so we can […]
Mini Light Intensity Meter Circuit using LDR
Here, is very simple and useful mini light intensity meter circuit using LDR which uses one LM334 IC, one LDR, small analog milliamp meter and 1.5V battery or power supply. The circuit checks light level by changing meter current as per LDR resistance. When light increases, LDR resistance changes so meter needle moves, because of […]
Simple Neon Lamp Fuse Blow Alarm Circuit
This post is for a Simple Neon Lamp Fuse Blow Alarm Circuit which helps us know when the fuse in the AC mains line gets open or blown. Normally, when the fuse is healthy, current flows through it and the load works in normal condition, when the fuse blows, the load stops working but at […]
Fuse Blown Status Indicator Circuit for 12V DC Supply
In many 12V power supply systems, fuse protection plays an important role, a fuse protects the load and other circuit parts from overcurrent and short circuit. However, sometimes the fuse blows and we do not know immediately, because of this the connected load stops working and so this Fuse Blown Status Indicator Circuit for 12V […]
Simple SCR Based Low Battery Display Circuit
A Simple SCR Based Low Battery Display Circuit helps us know when the 9V battery voltage drops near the critical level. For example, if the 9V battery level reaches 8.3V or 8.6V then the LED glows and because of this, the user can replace the battery before the connected device stops working. This circuit uses […]