Showing posts with label lm317. Show all posts
Showing posts with label lm317. Show all posts
Friday, October 3, 2014
Variable DC Power Supply LM317 circuit and explanation
This DC power supply circuit is adjustable using IC Voltage RegulatorLM317. LM317 is a versatile and highly efficient 1.2-37V voltageregulator that can provide up to 1.5A of current with a large heat sink. Its ideal for just about any application. This was my first workbench power supply and I still use it.
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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 voltage regulator LM317 is capable of delivering up to 37V, the DC power supply output circuit 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. Its ok to use a trimpot if youre building a fixed-voltage supply.
Problems: Follow all the safety precautions when working with mains voltage. Insulate all connections on the transformer. Possible uses: Variable workbench power supply, fixed-voltage supply. Just about any possible application when no more than 1.5A is necessaryhis BlogThis!Share to TwitterShare to FacebookShare to Google Buz
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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 voltage regulator LM317 is capable of delivering up to 37V, the DC power supply output circuit 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. Its ok to use a trimpot if youre building a fixed-voltage supply.
Problems: Follow all the safety precautions when working with mains voltage. Insulate all connections on the transformer. Possible uses: Variable workbench power supply, fixed-voltage supply. Just about any possible application when no more than 1.5A is necessaryhis BlogThis!Share to TwitterShare to FacebookShare to Google Buz
Thursday, August 28, 2014
Battery Charger LM317
Lead Acid Battery Charger schema is highly recommended to recharge battery. And recommended that maximum voltage 24V 7A battery, so you can recharge a battery simultaneously. Battery Charger has been little use of several components such as diodes, electrolytic capacitors, transistors, resistors, and also for strengthening of the voltage and current stresses. And also do not forget to lowering electric voltage 220V to 20V-35V 5-10 Ampere suitable for Lead Acid Battery Charger schema.
List of components for the schema Lead Acid battery:
R1 = 1Ω 2w
R2 = 100Ω
R3 = 220Ω
R4 = 10KΩ Trim
R4 = 10KΩ Trim
D1 - D5 = IN4004
Q1 = BC547
IC 1 = LM317
C1 - C2 = 1000µF 50V
C3 = 470µF 50V
Transformer I mentioned above can use the 5A - 10A with a secondary voltage of about 20Volt-35Volt AC. My advice to IC please be cooler, because when the schema and well even IC LM317 works it causes IC hot. Also to assemble the components using PCB (Printed works Circuit Board) qualified with a good track, as well as the components that will be used not forget to check back whether good or not, so it will also produce good results.
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