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MD7120 Class-D Audio Amplifier Design The AN-H61 design uses a self-oscillating, second-order, sigma-delta modulator circuit to convert a small analog audio input signal into two, 200 to 800KHz complementary PWM logic signals.

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10-100W Class-D Power Audio Amplifier Using MD7120 MOSFET Driver

10-100W Class-D Power Audio Amplifier Using MD7120 MOSFET Driver

Class-D Power Audio Amplifier Using MD7120 MOSFET Driver

This is the circuit design of Class-D power audio amplifier using IC MD7120 as MOSFET driver. The MD7120 used to drive four N- channel MOSFET Transistors that operate on both sides of the H-bridge switches. It consists of controller Logic circuits, level translators, two bootstrap powered high-side Gate drivers, two VDD powered low-side Gate…

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Horn and Lamp Flasher Circuit for Car Reverse Mode The flasher circuit (Second Circuit) is worked around clock NE555, which is wired as an astable multivibrator that yields square wave at its pin 3. A 10W auto bulb is utilized for flasher. The blazing pace of the bulb is chosen by preset VR1.

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Horn and Lamp Flasher Circuit for Car Reversing Gear Mode

Horn and Lamp Flasher Circuit for Car Reversing Gear Mode

The Horn Circuit

This is a basic circuit of car horn and lamp flasher that starts playing the vehicle horn at whatever point your vehicle is backward rigging. The circuit (First Diagram) utilizes double clock NE556 to create the sound. One of the clocks is wired as an astable multivibrator to produce the tone and the other is wired as a monostable multivibrator.

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Alarm Circuit for Drinking Water

Alarm Circuit for Drinking Water

This is the circuit diagram of drinking water alarm based a small water sensor by using aluminium foil and plastic foil, and connected to a very simple alarm based a 555 IC timer.

Water Sensor and Alarm

The Jal State Board supplies water for a limited duration in a day. The time for water supply is determined by administration and the community does not know the same. In this situation,…

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Active Antenna Amplifier For FM Radio

Active Antenna Amplifier For FM Radio

This is the circuit diagram of active antenna amplifier for FM radio device. With only a small handfull of parts you can built this trusty FM Amplifier to boost the signal from the radio transmitter. The circuit works with only 1 UHF/VHF type transistor, MFE201. This amplifier will pull in all distant FM stations clearly. The circuit is configured as a common-emitter tuned RF pre-amplifier wired…

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Universal Battery Charger for Charging up to 18V Cell

Universal Battery Charger for Charging up to 18V Cell

This universal battery charger has regulated output voltage which can be adjusted as you need. Also, this circuit has an adjustable constant-current charging circuit.  So, the circuit will be compatible and easy to use with the most NiCad batteries.  It capable to charge a single cell or a number of series-connected cells up to a maximum of 18V.

A series connection of power transistors T1 and T2…

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Auto Switch-Off Power Supply (Variable Output 3.7V to 8.7V)

Auto Switch-Off Power Supply (Variable Output 3.7V to 8.7V)

Here is the auto switch-off power supply which will turn off itself when there is no load on the output. The output voltage can be vary from 3.7V upto 8.7V. Although this circuit uses fixed-voltage regulator LM7805, but its output voltage is adjustable, thanks to a potentiometer installed between common terminal of regulator IC and ground. For every 100-ohm increment in the in-circuit value of…

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High Voltage, Low Current Power Supply (2000VDC from 15VDC)

High Voltage, Low Current Power Supply (2000VDC from 15VDC)

This is a high voltage, low current power supply capable to deliver 2000VDC output from 15VDC input voltage. It uses the combination of simple step-up transformer and Cockroft-Walton voltage multiplier circuit. Power supply with very high output voltage is a very useful source that can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors, etc. Such…

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200W MOSFET Amplifier based IRFP250N

200W MOSFET Amplifier based IRFP250N

Here is the 200W MOSFET amplifier powered based on four piece of IRFP250N, they are very cheap and easy to find in the electronic market in your area. The circuit has been assembled and tested with very good performance. (more…)

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300W RMS Stereo Power Amplifier based IC TDA7294

300W RMS Stereo Power Amplifier based IC TDA7294

This is the 300W RMS stereo power amplifier circuit project. This amplifier is based four pieces of power IC TDA7294. It’s mean that every single channel of the circuit uses two ICs in bridge mode. In this application, the load value must not be less than 8 Ohms. (more…)

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15V 1A Regulated Symmetrical Power Supply

15V 1A Regulated Symmetrical Power Supply

This is the easy built 15V 1A regulated symmetrical power supply capable to deliver stabilized voltage of +15V DC and -15VDC. The maximum current output is about 1 ampere up to 1.5 ampere refer to the datasheet. The circuit uses IC regulator LM7815 for positive voltage and LM7915 for negative voltage. To obtain different voltage output, just replace the IC regulator LM78xx and LM79xx, the xx code…

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Stereo Tone Control with Line In + Microphone Mixer

Stereo Tone Control with Line In + Microphone Mixer

This is an active stereo tone control circuit using very well known op-amp IC of TL072. The circuit include mic pre-amp and mixer control. In this design, we have two inputs: one for line (stereo), one for microphone and has control of the three audio frequency (high/treble, medium and low/bass). It also provide balance control between right and left channel, microphone volume control, line in…

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400 Watt 70 Volt Amplifier

400 Watt 70 Volt Power Audio Amplifier | Electronic Project

This is the schematic design of 400 Watt 70 Volt amplifier capable to deliver about 400W RMS power output in single channel. The component part list, PCB layout design and component placement layout is provided in this post. The power supply module already included ini the PCB design. The components are easily found in market. This circuit is using 8 transistors of 2SC5200 mounted in PCB, the…

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100W Power Amplifier Based IC TDA7294

100W Power Amplifier Based IC TDA7294

This is a very interesting circuit design to assemble. There are 4in1 amplifier module in a circuit board. 100W power amplifier using the TDA7294, for the VU meter uses IC LM3914. The tone control preamp uses the well-known IC 4558. The symmetrical power supply module also included in the PCB. (more…)

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120W Power Amplifier + Power Supply

120W Power Amplifier + Power Supply

This is 120W power amplifier schematic using TO-3 package complementary transistors, NPN and PNP polarity. The well-known power transistor pair of 2N3055 and MJ2955 used in this circuit.  +/- 50V symmetrical (split/dual polarity) power supply with minimum 3A electric current should be used for maximum performance. (more…)

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Bass Guitar Preamp Pedal

Bass Guitar Preamp Pedal

Here is the circuit diagram and PCB design for relatively low cost DIY bass guitar preamp pedal uses FET K117 or equivalent. There is a bit difficult to build this kind circuit project, it’s require a good knowledge in electronics. This preamp has several features for the bass guitar instrument such as attenuator, low cut, mid control and Hi boost. The circuit has some control: volume level, high…