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The Voltage Regulator Circuit Using LM317 circuit diagram shows a way of powering a two-way mobile radio using the LM317T voltage regulator. The LM317 T is an adjustable 3-terminal positive voltage regulator that efficiently provides a load current of 1.5 Amps over an output range of 1.2 V and 37 V. With reference to the circuit, it can accept 14 volts without any hassle and the voltage can be controlled easily with the use of a potentiometer, a 3-terminal resister with sliding contact. The whole circuit will contain the following components: Printed Circuit Board (PCB) Resistor 1 (R1): 270 ohms Resistor 2 (R2): 2K carbon potentiometer Capacitor 1 (C1): 100nF Capacitor 2 (C2): 1uF tantalum LM317T Voltage Regulator Heat Sink DC Power Jacks Green LED: Power Red LED: Over Voltage Zener Diode: over voltage LED switch The zener diode switches on the over voltage LED if the voltage passing through is larger than the breakdown or preset voltage. The use of zener diode permits a constant amou...

I have a circuit where I want to have a constant current of 2mA through a variable resistor. I've been told that I could probably use a LM317 as a current regulator, with one resistor on the ouput. But I've read some places that the LM317 takes minimum 5-10mA load to function correctly. How can I achieve a constant current output of 2mA when I don't know the resistance of the variable resistor? The input voltage is about 2.755V. Output voltage doesn't matter, just the current. Here's an image to my feeble attempt at a schematic: The LM317 with the single series resistor between output and adjust input is actually a fixed current source, not a current limiter. You don't need the LM317 to create a current limiter, a few discrete components will do: For a limiting at 2mA you select a 330 Ω resistor for R S E N S E . If there flows 2mA through it Q2 will start to conduct and reduce the base voltage of Q1, so that its current is cut off. edit (re changed question) ...

This 30v variable power supply circuit is based on LM317  voltage regulator circuit . This LM317 30v variable power supply circuit can deliver high current (around 5 amps) and variable output voltage between 1.2 volts, up to 30 volts. The led D3 mounted on pin 6 at lm301 lights in constant current mode . 30V Variable Power Supply Using LM317 Circuit diagram  Current limit can be adjusted using R2 potentiometer and the output voltage can be adjusted from 1.2 volts to 30 volts using R8 potentiometer . Input voltage for this variable power supply must be around 35 volts .For this power supply circuit you need to use LM317K circuit (in to3 package ) which must be mounted on a heatsink .

Hi everybody, Now I am here with a Automatic Battery Charger circuit having overcharge protection feature . In one of my previous post, we were discussed about a battery charger circuit. For that, the battery gets continously charged, and this overcharging affects the performance of the battery seriously. Today I am with a solution for that, as usual the circuit is simple to wire up, it consists only a few components and you can make this at your home itself. This circuit eliminates the battery draining due to overcharge, because the charger turnoff after the charging is made completed. Read More.....

Build a 1.2-36V 5A Adjustable Power Supply circuit diagram with LM317 . This circuit is a simple power supply circuit. 1.2 - 36V adjustable bench power supply with 5A of output current. Max input voltage is 37V and output is adjustable via potentiometer between 1.2 up to 36 volts. TIP147 PNP darlington transistor boosts the current of LM317 from 100mA to 5A. LM317 is the most useful and inexpensive adjustable regulator and for this circuit you can also use LM317 L that can give 100mA, that's enough for transistor bias.   1.2-36V 5A Adjustable Power Supply Circuit Diagram  D1 and D2 are protection diodes because when you turn the circuit off the output capacitors are discharging and can damage the transistor or regulator. 100nf capacitors are in parallel with electrolytic capacitors to remove high frequency noise because large value electrolytic have large ESR and ESL and can't remove high frequency noise.

Description: A truly timeless circuit. LM317 is a versatile and highly efficient 1.2-37V voltage regulator that can provide up to 1.5A of current with a large heat sink. It's ideal for just about any application. This was my first workbench power supply and I still use it. Since LM317 is protected against short-circuit, no fuse is necessary. Thanks to automatic thermal shutdown, it will turn off if heating excessively. All in all, a very powerful (and affordable!) package, indeed. Although LM317 is capable of delivering up to 37V, the circuit pictured here is limited to 25V for the sake of safety and simplicity. Any higher output voltage would require additional components and a larger heat sink. Make sure that the input voltage is at least a couple of Volts higher than the desired output. It's ok to use a trimmer if you're building a fixed-voltage supply. Problems: Follow all the safety precautions when working with mains voltage. Insulate all connections on the tr...

The fan runs continuously in many computers, it may not be necessary. A simple circuit controller can adjust the fan speed according to demand. This not only saves energy but also reduces s irritation fan noise. Only three components are required to enable the fan speed is controlled according to the cooling needs.  An adjustable voltage regulator that this circuit is the LM317 and two resistors form a voltage divider. One of the resistors is an NTC thermistor (temperature-sensitive resistor), while the other is a standard resistor.   Controller fan speeds using LM317 Circuit Diagram

Build a Simple Programmable Power Supply using LM317 Circuit Diagram . This is the Programmable Power Supply using LM317 Circuit Diagram type of the circuit simple and useful, it is a programmable DC power supply using LM317 . This circuit can set the output voltage for transistors.  The operation is simple, the transistors (T1-T4 = 2N2222 or any NPN transistors) are connected to resistors R which will grounded to determine the output voltage when one of the points ABC and D receives voltage, it makes the T corresponding drive your R to ground, so the voltage Vout changes according to the R, as you can see in the table below. The maximum voltage of this circuit is 27V when the input voltage is 28V.  Programmable Power Supply using LM317 Circuit Diagram This is when the output voltage of the DA is connected to Vin. (Values ​​of the resistors R) R Vout 100 1.8 330 3.0 470 4.0 1K 7.3 2.2K 13,5 3.3K 18,0