Showing posts with label Power. Show all posts
Showing posts with label Power. Show all posts
Symmetrical Power Supply LM317 337 Variable
Labels:
337,
LM317,
Power,
Supply,
Symmetrical,
Variable
0
comments
Symmetrical Power Supply LM317/337 Variable is circuit symmetrical power supply with output voltage output that can be set (adjustment). Circuit of symmetrical power supply LM317/337 variable uses variable DC regulator LM317 to regulator positive and negative voltage regulator LM37 variable for negative voltage regulator. Symmetrical Power Supply series LM317/337 Variables can be used to provide the source voltage with maximum current 1A.
In the application field can be mounted voltmeters at each point its output to ease in setting the output voltage level circuit Symmetrical Variable Power Supply LM317/337 this.
Circuit of symmetrical power supply LM317/337 variable using input source voltage of 18V AC 18V CT transformer CT. To set a positive voltage level can be done by adjusting the potentiometer 25K at the LM317 regulator and to regulate the negative voltage level carried out by adjusting the potentiometer 25K at the LM337 negative voltage regulator.
In the application field can be mounted voltmeters at each point its output to ease in setting the output voltage level circuit Symmetrical Variable Power Supply LM317/337 this.
Click image for full image
Circuit of symmetrical power supply LM317/337 variable using input source voltage of 18V AC 18V CT transformer CT. To set a positive voltage level can be done by adjusting the potentiometer 25K at the LM317 regulator and to regulate the negative voltage level carried out by adjusting the potentiometer 25K at the LM337 negative voltage regulator.
IC 7805 7905 based Power Supply 5V to 25V 5V to 25V 1A
Here is Circuit Power Supply Regulator Adjustable Voltage Output +5 to +25V, -5V to -25V 1A ,Use IC 7805 for +Vout and IC 7905 for -Vout.
VR1 for Adjustable + Volt output,VR2 for adjustable -volt output.
Simple 240VAC TO 5VDC POWER SUPPLY
This is simple way to power some 5v logic from a 240vac source. If a 120vac power adapter is used, the circuit will also work for 120vac power lines.
240VAC TO 5VDC POWER SUPPLY,
High Power Car Battery Eliminator
Labels:
Battery,
Car,
Eliminator,
High,
Power
0
comments
To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adaptors available in the market are generally costly and supply an unregulated DC. To overcome these problems, an economical and reliable circuit of a high-power, regulated DC adaptor using reasonably low number of components is presented here.
Transformer X1 steps down 230V AC mains supply to around 30V AC, which is then rectified by a bridge rectifier comprising 5406 rectifier diodes D1 through D4. The rectified pulsating DC is smoothed by two 4700μF filter capacitors C1 and C2. The next part of the circuit is a seriestransistor regulator circuit realised using high-power transistor 2N3773 (T1).
High Power Car Battery Eliminator Circuit Diagram:
![Battery]()
Transformer X1 steps down 230V AC mains supply to around 30V AC, which is then rectified by a bridge rectifier comprising 5406 rectifier diodes D1 through D4. The rectified pulsating DC is smoothed by two 4700μF filter capacitors C1 and C2. The next part of the circuit is a seriestransistor regulator circuit realised using high-power transistor 2N3773 (T1).
High Power Car Battery Eliminator Circuit Diagram:
Fixed-base reference for the transistor is taken from the output pin of 3-pin regulator IC1 (LM 7806). The normal output of IC1 is raised to about 13.8 volts by suitably biasing its common terminal by components ZD1 and LED1.
This simple arrangement provides good, stable voltcuit age reference at a low cost. LED1 also works as an output indicator.Finally, a crowbar-type protection circuit is added. If the output voltage exceeds 15V due to some reason such as component failure, the SCR fires because of the breakdown of zener ZD2. Once SCR fires, it presents a short-circuit across the unregulated DC supply, resulting in the blowing of fuse F1 instantly. This offers guaranteed protection to the equipment connected and to the circuit itself.
This simple arrangement provides good, stable voltcuit age reference at a low cost. LED1 also works as an output indicator.Finally, a crowbar-type protection circuit is added. If the output voltage exceeds 15V due to some reason such as component failure, the SCR fires because of the breakdown of zener ZD2. Once SCR fires, it presents a short-circuit across the unregulated DC supply, resulting in the blowing of fuse F1 instantly. This offers guaranteed protection to the equipment connected and to the circuit itself.
This circuit can be assembled using a small general-purpose PCB. A goodquality heat-sink is required for transistor T1. Enclose the complete circuit in a readymade big adaptor cabinet as shown in the figure.
Subscribe to:
Posts (Atom)
