Category: Electronics Projects

Water Level Indicator Circuit

Engineeering Projects
circuit diagram of digital water tank gauge

One of the most common circuits in the market is the water level indicator. But most of these circuits fault corrosion of metal electrodes due to electrolytic reaction. This fault can be minimized effectively by using alternating current instead of direct current supply. Here we design and verify a circuit called electrolysis proof water level indicator using a COMOS IC which has profitably exploited the normally unused property of CMOS devices. Other Water level indicators and controller circuits posted on bestengineeringprojects.com  Ultrasonic Water Level Meter Water Level Indicator Circuit using…

Read More

Preamplifier for ceramic-pickup

Engineeering Projects
circuit diagram of preamplifier for ceramic pick up

The circuit posted here is of a preamplifier for ceramic pick-up having moderately high input impedance about 470Ω and voltage gain of more than 12. Circuit Description of Preamplifier for ceramic-pickup The circuit of a preamplifier for ceramic pickup is built around FETs because it has outstanding low-level characteristics including a high input impedance and low noise. These characteristics make the FET a natural choice at the input stage of a preamplifier for accepting signals from high-impedance transducers such as ceramic-pickup. Inputs from the ceramic microphones are given to the…

Read More

Non-Destructive Power Supply Circuit

Engineeering Projects
circuit diagram of non destructive power supply

The power supply is the basic unit for any electronic circuit and it must be non-destructive. Various types of power supply circuits like stabilized power supply units, Digital control variable power supply units, self switching off power supply units, etc are available on bestengineeringprojects.com. Now, here is another circuit for smooth power supply in the section of power supply-based projects called a Non-destructive power supply circuit using voltage regulator IC 732. Working of the circuit non-destructive power supply-Circuit Most circuits are set to an adjustable “knee” from 2mA to 30mA.…

Read More

Sound Operated Relay Using Transistors

Engineeering Projects
circuit diagram of sound operated relay

Various type of switching circuit like a touch-operated relay, light operated relay, heat operated relay is already posted in bestengineeringprojects.com. Now here is another simple electronic project in the series of switching circuits called sound-operated relays. Circuit Description of Sound Operated Relay using Transistors The circuit of sound operated relay is self-explanatory and is very easy to understand. This circuit is built around a 2-stage audio amplifier using PNP transistors. The sound sensor of the circuit sound-operated relay is done by 8Ω loudspeakers. The output of the loudspeaker is given…

Read More

High-Gain Preamplifier Circuit Using Single Transistor

Engineeering Projects
circuit diagram of high gain preamplifier

The project posted here is of a high gain preamplifier circuit with a low input impedance of about 4 KΩ. It is capable of very high gain in the order of a few hundred if Rc is very greater than RL. Circuit Description of High Gain Preamplifier Circuit The circuit of the high gain preamplifier is built around a low-power NPN transistor T1 which is here configured in common emitter mode using self-bias or emitter bias. This biasing method is used because it produces excellent operating point stability. Resistor R1…

Read More

Simple Preamplifier Circuit using Single Transistor

Engineeering Projects
circuit diagram of simple preamplifier using transistor

The project posted here is of simple preamplifier circuit and is the simplest possible. This circuit provides a voltage gain of about 3 to 30 and is dependent upon source and load impedance. The simple preamplifier circuit has low input impedance. Description of Simple Preamplifier Circuit The circuit of the simple preamplifier is designed using a single low power amplifier transistor and is configured in common emitter mode. The input signal is given to the base of transistor T1 through capacitor C1. Capacitor C1 is a coupling capacitor to couple…

Read More

Listening Bug Using op-amp 741

Engineeering Projects
listening bug thumbnail

Here is a simple project called listening bug circuit using 741 using the most popular op-amp IC 741. This circuit can be used for spying because by using this circuit we can hear any conversation held in any other room or we can say using this circuit one can hear the conversation held in another room. This circuit can also be used for baby monitoring. Also, check our Listening Bug Circuit using op-amp LM386. Description of Listening Bug Circuit Using 741 The circuit of the listening bug shown in figure…

Read More

Metal Detector Circuit

Engineeering Projects
author prototype of simple metal detector

Metal detector is a device which is used to detect metallic object like metal coins, iron ore, aluminum or silver and gold etc. Here, we teach you how to make a metal detector circuit with which you can hunt hidden treasure. This simple metal detector circuit can also be used to detect buried cable or concealed wiring. You can also checkout metal detector using arduino. Description of Metal Detector Circuit This metal detector circuit is designed using three NPN transistors, IF transformer, search coil and few passive component. The metal…

Read More

Toy Siren Circuit Using CD7400

Engineeering Projects
circuit diagram of toy siren using cd4700

Various sound generating project is posted in Alarm and Sound Generation Section. Now here is very simple an easy to construct electronic project called Toy Siren using CD7400 (IC1). Circuit Description of Toy Siren Circuit Using CD7400 The heart of the project toy siren circuit is quad-2-input NAND gate IC CD7400 (IC1). IC1 (CD7400) is a cheap easily available IC and it consist four NAND gate. Two NAND gate out of four is configured as low frequency oscillator and another two NAND gate as high frequency oscillator. When output of…

Read More

Electronic Pendulum Using NE555

Engineeering Projects
circuit diagram of electronic pendulum using 555

Here is a simple, cheap and vary interesting electronic pendulum. The project electronic pendulum using NE555 can be used in various other gadgets i.e. it can be used in digital clock for pendulum view. Circuit Description of Electronic Pendulum Using NE555: The circuit of electronic pendulum comprises a timer IC NE555 (IC1), CD7400 (IC2), 4-bit up-down counter IC CD74193 (IC3) and a BCD to decimal decoder IC 7442 (IC4). Timer IC NE555 (IC1) is configures in astable multivibrator mode and generate square wave. The frequency of square wave generating from…

Read More
  1. Pages:
  3. 1
  4. ...
  5. 30
  6. 31
  7. 32
  8. 33
  9. 34
  10. 35
  11. 36
  12. ...
  13. 46