Operational Amplifier 741 Tester

Engineeering Projects
circuit diagram of OP-amp 741 tester

The op-amp IC 741 is a DC-coupled, high gain differential amplifier with external negative feedback. IC 741 is characterized by the almost infinite open-loop gain (100,000), almost infinite input impedance (2MΩ), and almost zero output impedance (75Ω).  IC 741 is the most popular, cheap, and easy-to-use op-amp. Various type of circuit is designed using Op-amp 741 out of which some are voltage follower, current to voltage converter and vice versa, summing amplifier, etc. Various type of circuit based on op-amp 741 is already posted in bestengineeringprojects.com on the op-amp section.…

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Flasher Circuit

Engineeering Projects
circuit diagram of lml vespa flasher

Replacement of burnt LML vespa flasher costs around $ 2.5. The flasher can be replaced with the help of the circuit sows here. It costs around $1.2. Circuit Description of LML Vespa Flasher The circuit of LML vespa flasher consists of a multivibrator built around transistors T1 and T2. The time period of the pulse can be varied by changing the values of R1, R2, C1 and C2. The values shows in the circuit are chosen to match the flasher with the flashers available in the market. Gates of TRIAC…

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Mains Supply Interruption Indicator Circuit

Engineeering Projects
mains supply interruption indicator

The Mains Supply interruption indicator circuit can be used in applications where it is necessary to know whether the mains supply has been continuous or not. The circuit mains supply interruption indicator will be useful for monitoring mains supplies to recording equipment, especially in the recording of computer software tapes, where the slightest interruption in the mains supply will cause an error in the data being recorded. It can also be used with digital clocks working on mains. An interruption in the mains supply will cause an LED to flash…

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Variable Switching Power Supply

Engineeering Projects
variable switching power supply circuit

Various type of power supply circuit from basic regulated power supply to advanced digital control power supply unit is already posted on bestengineeringprojects.com. Now here one more power supply circuit is posted and can be used to provide up to 300mA and voltage between 6V to 13V. Circuit Description of Variable Switching Power Supply The input AC is stepped down using a step-down transformer T1 to 18V AC which is further rectified by a bridge rectifier. The rectified output is filtered by 1000 capacitor C1. The Zener diode ZD1 is…

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Low Power Alarm with Automatic Timer

Engineeering Projects
low power alarm with automatic timer circuit

Various types of alarm and sound generator circuit is already published in bestengineeringprojects.com. Now here is a alarm circuit which draws very low quiescent current and also does not need any type of power on off switch because this offers automatic switch-off after fixed time. Circuit Description of Low Power Alarm with Automatic Timer The heart of the circuit low power alarm circuit is 4060 IC, which is here configured as timer. The advantage of using IC 4060 (IC1) is the wide music range instead of UM series musical IC.…

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Smallest Radio Circuit Using Two Transistors

Engineeering Projects
circuit diagram of match box size radio

This small size radio published is very interesting and useful for students. Using the circuit Smallest Radio Circuit Using Two Transistors describe here one can make a very compact MW radio receiver. This circuit of radio receiver uses only two transistors and a few passive components only. As all the components can be easily placed in a small matchbox size cabinet. Smallest Radio Circuit Using Two Transistors Coil L1 consists of 100 turns of 40 SWG insulated wire. Wind L2 over L1 which is 10 turns of the same wire.…

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Mains box heat monitor using 555 Timer IC

Engineeering Projects
mains box heat monitor circuit

Here is a simple circuit mains box heat monitor for sensing high temperature due to overheating. This circuit helps to prevent disasters caused by only sparking in the mains box due to any fault as a short circuit overloaded. This circuit is so designed that it also automatically switches on a bright white LED (LED3) in case of power failure. This light is sufficient to check the mains box wring or fuses in darkness. Circuit Description Mains Box Heat Monitor The circuit is built around a timer IC, a sensor,…

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Light operated internal door latch

Engineeering Projects
mechanical arrangement for the lock

Previously, we have posted light controlled digital fan regulator, with which we can control the speed of the fan remotely from the bed with the help of a torchlight. Now, here is another light-operated project which can also operate remotely from the bed with a torchlight. The group electronics hobbyist at Best Engineering Projects designed and verified a very unique electronic circuit light operated internal door latch with which one can close or open the door of your room remotely.” Check out other security-related projects posted on bestengineeringproject.com Car Lock…

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Universal Digital Power Supply Circuit

Engineeering Projects
variable digital power supply unit

Various types of power supply circuits like fixed regulated, variable power supply, and stabilized power supply circuits are already published on bestengineeringproject.com. Most of us hear about the universal power supply, it is a power supply unit that provides almost all standard power supply. How’s that if we combine a universal power supply and a digital control technology. Here, the innovative group of Dreamlover Technology designed and verified a universal power supply circuit with the facility of digital control. The unit universal digital power supply provides a variable, fluctuation-free and…

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Stabilized Power Supply With Short-Circuit Indication

Engineeering Projects
stabilised power supply with short circuit indicator

Various power supply-based project is already posted on bestengineeringprojects.com. Now, here is a stabilized power supply circuit with the facility of short-circuit indication. As we know that stabilized power supply is used for testing various electronics circuits and is very important for electronics geeks or hobbyists. The circuit presented here is of a 5-stage stabilized power supply unit and it provides well-regulated output, which is essential for most electronics circuits for proper results. Another advantage of the circuit stabilized power supply with short-circuit indication has it provides an audio-visual indication…

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