Category: power supply

Many types of emergency light circuits are already available in the web world. Now, here is a unique circuit that glows a fluorescent tube at a voltage as low as 80 volts. This unique circuit Advance Emergency Light Circuit operates at a 12V battery and also charges the battery up to 12V, 15AH at a constant rate. Block Diagram of Advance Emergency Light Circuit The block diagram of the advanced emergency light circuit with charger unit is shown in figure 1. It consists of a power supply for emergency light,…

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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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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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This is a complete short-proof variable power supply circuit that gives 3V, 5V, 6V, 9V, 12V, and 15V output voltage and a maximum output current of 700mA. The unique feature of the circuit short proof variable power supply is that the power dissipated is reduced to a negligible level during short-circuit or overload conditions. In conventional power supplies, the maximum rated current continuously flows through the load under overload conditions. This may damage the power supply and the load. Working of Short Proof Variable Power Supply Circuit The circuit short-proof variable…

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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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We are aware that when the line voltage becomes more than 250 volts and less than 160 volts, it can damage our TV sets, refrigerators, etc. Hence, we use voltage stabilizers which are costly. The circuit Automatic Cut-off Power Supply described here is low-cost. The assembling cost comes to around $1 only. If the voltage exceeds the mentioned range it automatically cuts off the supply so that the life of the TV set and other devices can be extended. Circuit Description of Automatic Cut off Power Supply The common point of…

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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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