AUTOMATIC BATHROOM LIGHT BASIC ELECTRONICS PROJECT

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AUTOMATIC BATHROOM LIGHT DIAGRAM AND PROJECT

This circuit is used to automate the working of a bathroom light. It is designed for a bathroom fitted with an automatic door-closer, where the manual verification of light status is difficult.

UNIVERSAL HIGH RESISTANCE VOLTMETER BASIC ELECTRONICS PROJECT

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A DIAGRAM ON UNIVERSAL HIGH RESISTANCE VOLTMETER


The full-scale deflection of the universal high-input-resistance voltmeter circuit shown in the figure depends on the function switch position as follows:
(a) 5V DC on position 1
(b) 5V AC rms in position 2
(c) 5V peak AC in position 3
(d) 5V AC peak-to-peak in position 4

TYPES AND SPECIFICATIONS OF FREQUENCY SIGNAL FILTERS BASIC ELECTRONICS INFORMATION

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WHAT ARE THE TYPES AND SPECIFICATIONS OF FREQUENCY SIGNAL FILTERS?


There are many types of filter. The more popular ones are:
• Butterworth or maximally flat filter;
• Tchebyscheff (also known as Chebishev) filter;
• Cauer (or elliptical) filter for steeper attenuation slopes;
• Bessel or maximally flat group delay filter.

MT - RJ CONNECTOR BASIC ELECTRONICS INFORMATION

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WHAT ARE MT - RJ CONNECTOR?

The MT-RT connector utilizes the same rectangular plastic ferrule technology as the MTP array-style connector first developed by NTT, with a single ferrule body housing two fibers at a 750-um pitch (Fig. 3.1). 

THE DIFFERENT DVD REGIONAL CODES BASIC ELECTRONICS INFORMATION

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WHAT ARE THE DIFFERENT DVD REGIONAL CODES?


Motion picture studios want to control the home release of movies in different countries because cinema releases are not simultaneous worldwide. Movie studios have divided the world into six geographic regions. In this way, they can control the release of motion pictures and home videos into different countries at different times.

THE DIFFERENT DVD FORMAT TYPES BASIC ELECTRONICS INFORMATION

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WHAT ARE THE DIFFERENT DVD FORMAT TYPES?


The three application formats of DVD include DVD-Video, DVD-Audio, and DVD-ROM. The DVD-Video format (commonly called “DVD”) is by far the most widely known. DVDVideo is principally a video and audio format used for movies, music concert videos, and other video-based programming.

IF NOTCH REJECTION BASIC ELECTRONICS

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WHAT IS IF NOTCH REJECTION?


If two signals fall within the passband of a receiver they will both compete to be heard. They will also heterodyne together in the detector stage, producing an audio tone equal to their carrier frequency difference.

-1dB COMPRESSION POINT AND THIRD ORDER INTERCEPT POINT

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WHAT ARE -1dB COMPRESSION POINT AND THIRD ORDER INTERCEPT POINT?


–1 dB compression point

An amplifier produces an output signal that has a higher amplitude than the input signal. The transfer function of the amplifier (indeed, any circuit with output and input) is the ratio OUT/IN, so for the power amplification of a receiver RF amplifier it is Po/Pin (or, in terms of voltage, Vo/Vin).

INTERMODULATION PRODUCTS OF TWO DIFFERENT FREQUENCIES

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FREQUENCIES INTERMODULATION INFORMATION


Understanding the dynamic performance of the receiver requires knowledge of intermodulation products (IP) and how they affect receiver operation. Whenever two signals at frequencies F1 and F2 are mixed together in a non-linear circuit, a number of products are created according to the mF1 ± nF2 rule, where m and n are either integers or zero (0, 1, 2, 3, 4, 5, . . .).

FIXED LOW FREQUENCY LED FLASHER BASIC ELECTRONIC PROJECT

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HOW TO MAKE FIXED LOW FREQUENCY LED FLASHER

This circuit, when completed, causes a light-emitting diode (LED) to flash or pulse alternately on and off at a very slow rate, that is, at a low frequency. It could be used as a dummy car alarm indicator. You sometimes see these tiny pulsating lights in expensive cars protected by sophisticated car security systems, warning you that the car alarm is armed and ready. 


MULTI-SWITCH DOORBELL WITH INDICATORS BASIC ELECTRONIC PROJECT

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DIAGRAM AND HOW TO MAKE MULTI-SWITCH DOORBELL WITH INDICATORS


Here’s the circuit of a multi-switch input musical doorbell (shown in Fig.1). The circuit is built around the popular and less expensive quad D-latch CD4042B (IC1).

When switch S6 is pushed to ‘on’ condition, the circuit gets +9V and the four data inputs (D1 through D4) of ICI are in low state because these are tied to ground via resistors R1 through R4. Polarity input (POL) pin 6 of IC1 is also pulled down by resistor R5.


SUCTION CUP PHONE PICKUP PROJECT

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HOW TO MAKE A SUCTION CUP PHONE PICKUP 

It is often very convenient for other people in the room to listen to both sides of a phone conversation. The amplifier in this it has been designed for this use. A specially designed magnetic pickup with a suction cup attaches onto the earpiece of your phone at one end and into the amplifier at the other.

HARTLEY OSCILLATOR CIRCUIT TUTORIALS

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HARTLEY OSCILLATOR DIAGRAM AND INFORMATION

This oscillator is very similar to the Colpitts except that it has a split inductance. It is represented in a similar way to the Colpitts, as seen in Fig. 1.14. It may be designed using a similar approach to the Colpitts but it has the disadvantages of mutual inductance between the coils, which causes unpredictable frequencies, and also the inductance is more difficult to vary. 

SAVING DAMAGED PRINTED CIRCUIT BOARDS (ELECTRONICS REPAIR)

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HOW TO SAVE DAMAGED PRINTED CIRCUIT BOARDS (PCBs)


When you desolder a through-hole component, one unfortunate result of failing to get the hole hot enough is that its copper lining comes out with the lead. If you see what looks like a sleeve around the lead, you’ve torn out the copper. On a double-sided board, it’s not a catastrophe.

When you replace the part, be sure to solder both the top and bottom contact points, and all will be well. You might have to scrape some of the green solder mask coating off the top area to get contact between the lead and the foil. That’s best done with the tip of an X-Acto knife.

FIBER OPTICS IN COMMUNICATION HISTORY

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HISTORY OF FIBER OPTICS USE IN COMMUNICATION

In 1880, only four years after his invention of the telephone, Alexander Graham Bell used light for the transmission of speech. He called his device a Photophone. It was a tube with a flexible mirror at its end. He spoke down the tube and the sound vibrated the mirror.

The modulated light was detected by a photocell placed at a distance of two hundred meters or so. The result was certainly not hi-fi but the speech could at least be understood.

ELECTRONIC COMMUNICATION PROPAGATION PATHS

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WHAT ARE THE ELECTRONIC COMMUNICATION PROPAGATION PATH

There are four major propagation paths: surface wave, space wave, tropospheric, and ionospheric. The ionospheric path is important to medium-wave and HF propagation, but is not important to VHF, UHF, or microwave propagation.

The space wave and surface wave are both ground waves, but behave differently. The surface wave travels in direct contact with the Earth’s surface, and it suffers a severe frequency dependent attenuation due to absorption into the ground.

MEDIUM WAVE RECEIVER PROJECT

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HOW TO MAKE A MEDIUM WAVE RECEIVER

Let us start off with something that is really quite simple and yet is capable of producing a sense of real satisfaction when complete – a real mediumwave (MW) radio receiver! It proves that receivers can be simple and, at the same time, be useful and enjoyable to make.
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