A versatile Decibel Meter Circuit

Engineeering Projects
audio application circuit

A decibel meter is an instrument to measure levels of the input signal(s) in decibel units. The main areas of application of decibel meter are audio level indicators, record level indicators, spectrum analyzers, and the like. The project “A versatile decibel meter circuit” shows here provides a resolution of 20 steps. Although the steps are linear, they are calibrated with corresponding decibel value so that it suits most of the requirement. Description of Versatile Decibel Meter Circuit The schematic diagram of the versatile decibel meter circuit is shown in figure…

Read More

Electronics Washing Machine Control | Circuit Diagram

Engineeering Projects
electronics washing machine circuit

Nowadays, commercially available washing machines are provided with features like the auto-off timer, reversible impeller, etc. Most of them have mechanical timers, reverses, etc. Some are equipped with electronic timers. But they are very expensive and out of reach of the average consumer. Electronic Washing Machine Control circuit provides all the facilities provided by reputed companies and even more. The circuit has a timer circuit that can be set to any duration from 0 to 15 minutes and can be extended to any length of time by merely changing a…

Read More

Simple Paint Program Using C

Engineeering Projects
devc program

Note: You are free to download, use, edit, update and rebuild the program and source codes downloaded from here, But Please don’t forget to give considerable credits to Dreamlover Technology and bestengineeringprojects.com if you do so. A Paint Program is a program which allows you to draw pictures and symbols into the screen. Here you will find the tutorial to build a Simple prototype of a paint program. The software build will not be reliable and perfect enough to implement it in a real working environment like to edit a…

Read More

Transformer Test Circuit to Overcome Line Voltage Variation

Engineeering Projects
transformer tester circuit

One of the initial production tests carried out on power transformers used in electronic equipment is the measurement of on-load voltages across their secondary windings. During this test, the basic requirement is that the voltage across the primary winding is maintained at the rated line voltage. But in practice, there will be variations in the line voltage and its effect will be reflected on the secondary side. Hence the test carried out will have their internal error. Circuit Description of Transformer test circuit to overcome line voltage variation Here is a…

Read More

Ten Channel Sequential Lighting Circuit

Engineeering Projects
ten channel sequential lighting circuit

The project Ten channel Sequential Lighting presented here gives a flashing light effect from left to right and then from right to left. IC1 (NE555) generates clock pulses for IC2. The output using rectifiers produce the effect of bulbs flashing from left to right. As the carry output pin 12 of IC2 is connected to the clock input of IC3, the bulbs which are connected to IC5 also starts flashing from right to left. As these outputs are not capable of handling large currents, they have to be amplified to…

Read More

Dynamic Display Ads Circuit

Engineeering Projects
dynamic display circuit

This project of “Dynamic Display Ads Circuit” is based on serial input and parallel output sift register 74164. With the help of the project dynamic display ads circuit we can build a display board, where LEDs blink to give a running light effect. Circuit Description of Dynamic Display Ads Circuit The project dynamic display ads circuit may be used to advertise or display of name plates etc. It is made versatile by using the 555 and 74 series of ICs, which are readily available in the market. In the dynamic…

Read More

Fuzz effect box for Guitarists

Engineeering Projects
fuzz effect box for guitarist circuit

The ‘fuzz’ sound is derived by clipping the input waveform, thereby enriching the signal with odd harmonic which provide the hash sound. This circuit “Fuzz Effect Box for Guitarists” is a basic project produces a fuzz which gradually decays into a ‘clean signal’. Circuit Description of Fuzz Effect Box for Guitarists The circuit uses the standard op-amp 741 in non-inverting configuration. The gain of this amplifier is controlled by the feedback network comprising VR1, R2 and R3. Input signal from the guitar passes to the op-amp through DC blocking capacitors…

Read More

Pocket Radio Using LA4510

Engineeering Projects
pocket radio circuit using LA4510

Here is a circuit for a pocket radio using one IC LA4510 and three transistors. This circuit differs from ordinary circuits at the audio stage only. Here a small 9-pin IC LA4510 is used. It replaces three transistors, a driver transformer, and many other passive components. The amplifier circuit needs only one resistor! At zero signal level, this circuit draws 8-10 mA current only. With a 3-volt supply, this circuit can give 200 mW output power. For making this radio you may buy an ordinary pocket radio PCB and assemble…

Read More

Mini Emergency Light Circuit

Engineeering Projects
automatic mini emergency light

There are various type of emergency light circuits. Every circuit has its own importance and utility. But size, cost and efficiency of the circuit are some of the main feature of interest. A very simple circuit of mini emergency light is given here. In normal daylight or electric light, the LDR offer very low resistance. So the positive voltage is applied to the base of transistor T1, making it reverse biased. Therefore, T1 does not conduct in presence of light. As transistor T2 also is reverse biased it does not…

Read More

Automatic Cut off Power Supply

Engineeering Projects
automatic cut-off power supply

We are aware that when the line voltage becomes more than 250 volts and less than 160 volts, it can damage our TV sets, refrigerators, etc. Hence, we use voltage stabilizers which are costly. The circuit Automatic Cut-off Power Supply described here is low-cost. The assembling cost comes to around $1 only. If the voltage exceeds the mentioned range it automatically cuts off the supply so that the life of the TV set and other devices can be extended. Circuit Description of Automatic Cut off Power Supply The common point of…

Read More
  1. Pages:
  3. 1
  4. ...
  5. 64
  6. 65
  7. 66
  8. 67
  9. 68
  10. 69
  11. 70
  12. ...
  13. 84