The discussed circuits are designed to discourage dogs from barking in the selected zone by the generation of a synchronized ultrasonic sound waves in response to a few initial barking of a particular dog. The circuits explained below when correctly optimized will produce a high pitched ultra sonic sound each time it senses a dog […]
Newly Updated Circuit Projects:
Clap Switch Circuits with Relay ON/OFF: [Tested]
The clap switch circuits explained here will toggle a connected load ON and OFF in response to alternate clap sounds? Here I have explained 4 unique and simple designs which can be selected as per user preference. The article talks about what the title suggests – a clap switch. A small electronic circuit when built […]
Single Ended nOOds, 300mm long Flexible LED Filament, Warm White 3V
So here we are talking about this cool looking thing called Single Ended nOOds, basically it is a type of flexible LED filament which is 300mm long which means around 30 cm, like one standard scale. It glows in warm white color and works nicely with just 3V DC. What is it, actually? This LED […]
Understanding CMOS IC 4035 Datasheet – 4-Bit Parallel In Parallel Out Shift Register
So now we are talking about this digital IC called 4035 which is made using CMOS technology, that means it will use very low current and will give us high noise immunity. Inside this IC we have got 4 flip-flops which are arranged in such a way that they can hold and shift 4-bit data. […]
Letter Box Open Indicator Circuit
In this post I have explained how to build a letter box open indicator circuit, which indicates through an LED if the letter box had been opened either by the postman, or by somebody else! The idea was requested by Mr. Bill. I wonder if you could help me.I want to make an LED indicator […]
Tuned Radio Frequency (TRF) Receiver Circuits
A tuned radio frequency receiver (or TRF receiver) is a form of radio receiver which is made using a number of tuned radio frequency (RF) amplifier stages accompanied by a detector (demodulator) circuit to draw out the audio signal, along with an audio frequency amplifier for amplifying the extracted audio into a loudspeaker. This kind […]