This circuit is a Simple Diode and Transistor Based Audio Limiter Circuit and we use it in audio systems where signal level must stay under safe limit. Most power amplifiers require an input signal of around (1Vrms) and if the signal exceeds this level, the amplifier can distort the sound or even damage itself. Audio […]
Security and Protection
Simple Reverse Polarity Protection Buzzer Alarm Circuit
In many electronic circuits, wrong battery connection can damage sensitive components, therefore, a Simple Reverse Polarity Protection Buzzer Alarm Circuit gives an early warning before damage happens. This circuit is simple, low cost and easy to build, also it uses common parts like diode, resistor, LED and buzzer. When we connect the supply in the […]
Simple LDR Based Refrigerator Door Warning Circuit
In our previous post, we designed a Refrigerator Door Open Alarm Circuit with IC 555 but however, in this post, we design a Simple LDR Based Refrigerator Door Warning Circuit without using any IC. Moreover, this circuit helps to alert the user when the fridge door stays open for a long time, as this simple […]
Dual Threshold Voltage Comparator Circuit using IC LM741
A dual limit comparator is an important electronic circuit which compares one input voltage with two fixed voltage levels. In simple words, this Dual Threshold Voltage Comparator Circuit using IC LM741 checks whether the input voltage stays within a fixed range and it also checks whether the voltage crosses the upper limit or the lower […]
Simple AC Mains Presence Indicator Circuit
An Simple AC Mains Presence Indicator Circuit helps us check whether AC mains supply is present at the input and whether power reaches the load side. This circuit is easy, low-cost and very useful for home appliances, control panels, extension boards and industrial systems. In this circuit, two LEDs show two different conditions, first LED1 […]
Solar Sensor Based Security Alarm Circuit using Transistors
This is a simple and low-cost Solar Sensor Based Security Alarm Circuit using Transistors which uses a solar sensor for light sensing. The circuit gives alarm sound through the speaker when light level changes and it works mainly when darkness comes or when someone blocks light on the sensor. So we can use this circuit […]