Category: Electronics Projects

Four channel audio mixer

Engineeering Projects
four channel audio mixture circuit

As per the name of the circuit, it is clear that this circuit connects four different audio signals as one. So, it is call four channel audio mixer. Here is that simple circuit; “four channel audio mixer” using op-amplifier 741.  It is to be noted in the circuit that the op-amplifier 741 works here as an inverting amplifier. Circuit Description of four channel audio mixer: The circuit of four channel audio mixer is wired around op-amp IC 741 followed by few other active as well as passive components. The IC 741…

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Frequency Counter Using Digital MultiMeter

Engineeering Projects
frequency counter circuit using digital multimeter

As being electronic hobbyists we love to design and verify various types of circuits, we often have to measure the output frequency. The device which is used for this purpose is called the frequency counter. A frequency counter is an electronic device that measures the frequency of electric and electronic circuits by counting clock pulse. The frequency counter available in markets is quite expensive and sometimes we cannot afford it. In BEP LAB we designed and verified a circuit called “Frequency Counter Using Digital MultiMeter” which will serve as an…

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Crystal controlled inverter | Verified Inverter Circuit

Engineeering Projects
crystal controlled inverter circuit

Many Inverter Circuits have already been posted on many other websites. The inverter circuit “Crystal Controlled Inverter” presented here provides a stable output frequency even when there is a change in the DC voltage applied to the inverter. This stable output of the Crystal control Inverter is obtained from the 3.2786 MHZ crystal (XTAL1). You can also make your 3000W inverter using a microcontroller. Circuit Description of Crystal Controlled Inverter. The Inverter circuit “Crystal Controlled Inverter” is built around popular flip flop IC MM 5369 (IC1) followed by a few…

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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…

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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…

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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…

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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…

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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…

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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…

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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…

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