Category: Electronics Projects

Audio Running Lights Circuit

Engineeering Projects
audio running light circuit

Here is a project for audio running lights circuit which uses filament bulbs instead of LEDs. The circuit employs seven channel darlington array IC ULN2004 and seven reversed biased zener diodes having different breakdown voltages. At low audio level, zener diodes having low breakdown voltages will conduct and corresponding lamps will light up. When output level increases, the other diodes will also conduct. As a result, you can see a very fine display of ‘moving’ light bulbs from top to bottom or from left to right, as per their arrangement.…

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100 Rung Exclusive Counter

Engineeering Projects
100 rung exclusive counter

Digital counters are frequently needed in all kinds of counting circuits, test gear, sequential displays, timers, etc for up to ten outputs (exclusive and independent), or 16 at the most. But the problem arises when it comes to using more than these many outputs. In such a case, the 4017-based CMOS counter can be put to use as a 100-stage counter. The circuit configuration uses a dozen 4017 counter ICs. IC12 sends clock pulses to IC11 at one-tenth of its input frequency, which in turn allows Qa through Qj to…

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Electronics Fuse Circuit | Electronic Circuit Breaker

Engineeering Projects
electronic fuse circuit

Fuse protection for electronics circuits seems to be an outmoded idea, for there are circuits (in computers etc) that consume high currents initially at a lower stable value. In case high-rated fuses are employed in such equipment to accommodate the initial surge current, it defeats the very purpose of protection. Slow-blow fuses often turn out to be too slow while quick-action fuses may blow out at the mere hint of a surge. An electronics fuse circuit of the kind described here provides an ideal solution in such cases. An electronic…

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Digital Clock Circuit with Seconds and Alarm Time Display

Engineeering Projects
digital clock with second and alarm time display

Most of the digital clock available on the website is only capable to display hour and minute only. Now, here is a project called Digital Clock Circuit with Second and Alarm Time Display which shows not only ­hour, minute, and second but also alarm time. Best Engineering Projects (BEP) verify the project Digital Clock with Second and Alarm time display with the help of ten 7-segment displays and clock chip mm5387ANN. Circuit Description of Digital Clock Circuit with Seconds and Alarm Timer Display The entire circuit of the Digital Clock…

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Ultrasonic Lamp Brightness Controller Circuit

Engineeering Projects
ultrasonic lamp brightness control receiver circuit

Wireless control of devices using infrared is not new to electronics hobbyists. Now, here is wireless control of the device using ultrasonic sound waves tested in BEP Lab. The project ultrasonic Lamp brightness controller circuit uses ultrasonic sound waves (above 20 kHz) for remote control of lamp brightness. Circuit Description of Ultrasonic Lamp Brightness Controller Circuit As with all wireless control systems, the Ultrasonic lamp-brightness controller comprises a transmitter and receiver circuit. Transmitter Circuit | Ultrasonic Lamp Brightness Controller Circuit The transmitter circuit generates an ultrasonic sound wave of about 40-50…

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Adjustable Bipolar Voltage Regulator Circuit Using LM337

Engineeering Projects
adjustable bipolar voltage regular circuit

For op-amp circuits, the power supply must provide positive and negative voltages. Here is a simple circuit “Adjustable Bipolar Voltage Regulator” which gives a regulated ± 1.2V to ±2oV supply. ICs LM317K (IC1) and LM337K (IC2) are used here as positive and negative regulators respectively. Circuit Description of Adjustable Bipolar Voltage Regulator using LM337 The circuit diagram of the adjustable bipolar voltage regulator using LM337 is shown in figure 1, and is designed using two positive and negative adjustable voltage regulator IC, a step-down transformer, a bridge rectifier, and a…

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Hex to Binary Converter Circuit

Engineeering Projects
hex to binary encoder circuit

The circuit described here is a hex to binary converter circuit using four, 8-input NAND gate 7430 ICs. The input keyboard switches SW1 to SW15 are connected in such a manner that the pressing of any switch produces the binary ABCD outputs of the corresponding decoded numbers. When all inputs in a NAND gate are high, it produces a low output, But when any of its input goes low, its output becomes high. Normally, all switches are open, the binary output is 0000. Pressing a switch gives a ‘low input’…

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Electronic Siren Circuit using OP-Amp 741

Engineeering Projects
Electronics siren circuit

Here is an inexpensive electronic siren circuit built around the most popular and low-cost IC 741. The circuit is basically a square wave generator that is used here to produce the tone of a siren. Circuit Description of Electronic Siren Circuit using OP-Amp 741 The IC1 is used as a low-frequency multivibrator, the output of which modulates the high-frequency tone produced by the IC2 multivibrator. The final output is amplified and converted into a loud siren by transistor T1 and the speaker. Various interesting tones can be obtained by changing the…

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Staircase Switch Circuit

Engineeering Projects
electronics staircase switch using 555 ic

If you want to control an electrical appliance from two places then you use the 2-way switch. But to control it from more than two locations (like operating a hotel’s staircase light from individual floors from various locations), the circuit “Staircase Switch” comes to your help. Due to the small size of the staircase switch circuit, it can be installed within a junction box. Circuit Description of Staircase Switch Circuit Staircase Switch Circuit utilize IC1 (NE555) as a timer with timing of 0.7 seconds, for this it is configured in…

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3 Phase Induction Motor Starter

Engineeering Projects
3-phase automatic induction motor starter circuit

This circuit “3 Phase  Induction Motor Starter” is one such starter. It is a very low-cost but highly reliable gadget, besides being fool-proof. Of all AC motors available, a polyphase induction motor is one that is mostly used in several kinds of industrial drives. this is because it is simple, extremely rugged, low cost, reliable, high efficient and requires little maintenance. Among the induction motors available, a squirrel cage machine is the best. However, such an induction motor can never be started by direct switching, as the motor can never…

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