simple split rail power supply lm380

A simple split rail power supply based on the LM380 power supply. The design is intended to provide an inexpensive high-power supply, initially available in three power levels. A wide range of accessories is included to maintain an attractive price point. Additionally, there is a simple battery monitor circuit where the LED continues to flash until the battery voltage exceeds a specified level. Transistors Q1 and Q2 are configured as an astable multivibrator circuit. This flashing battery monitor circuit can operate from a variety of voltages ranging from 6V to 12V. The voltage level at which the LED stops flashing can be adjusted by modifying resistor R4. When the preset battery voltage reaches the threshold, the flashing frequency decreases, and when the voltage drops below the threshold, diode D1 causes the LED to turn off. This circuit compensates for changes in the base-emitter voltage of Q1 due to varying conditions.

The simple split rail power supply utilizes the LM380 integrated circuit, which is known for its ability to deliver a regulated output voltage with high current capabilities. The design typically features dual output rails, allowing for positive and negative voltage supplies, which are essential for powering operational amplifiers and other analog devices. The power supply can be configured to provide various output levels, making it versatile for different applications.

The battery monitor circuit employs an astable multivibrator configuration using transistors Q1 and Q2. This configuration ensures that the LED indicator flashes at a consistent frequency, providing a visual cue regarding the battery status. The frequency of the flashing is directly related to the battery voltage, and the circuit is designed to operate effectively within a voltage range of 6V to 12V.

Resistor R4 plays a crucial role in setting the threshold voltage for the LED operation. By adjusting R4, the user can define the specific voltage level at which the LED will cease to flash, indicating that the battery voltage has reached a satisfactory level. This feature is particularly useful in applications where monitoring battery health is critical, such as in portable devices or backup power systems.

The inclusion of diode D1 adds an additional layer of functionality by ensuring that when the battery voltage drops below the defined threshold, the LED is turned off, thus conserving power and preventing false indications. This design effectively compensates for variations in the base-emitter voltage of transistor Q1, ensuring reliable operation across different battery conditions.

Overall, this circuit design presents a cost-effective solution for power supply needs while also providing a practical method for monitoring battery status, making it suitable for a variety of electronic applications.Simple Split Rail Power Supply based LM380 power supply. Go to that page to read the explanation about above power supply related circuit diagram. With the GX-Series Cooler Master released a new PSU. The model designed as an inexpensive high-power supply, initially with three power levels are available. On wide range of accessories is so deliberately in order to offer an attractive price level. Powerful. Here is asimple battery monitor circuitin which theLEDwillcontinueflashinguntil battery voltageis above thelevel. TransistorsQ1andQ2arewiredasan astable multivibratorcircuit. Thisflashingbatterymonitorcircuitcan operatefroma variety ofvoltagesfrom6Vto12V. Thevoltagelevelat whichanLEDstopsflashingcan be setby adjustingR4. When thea presetbatteryvoltagereachesthresholdflashingfrequencydecreasesandwhenthe voltagedrops belowthe threshold ofthe diodeD1LEDturnsOFF.

This is usedtocompensate for changesinvoltage ofthe baseemitterQ1due the. 🔗 External reference