Showing posts with label Adjustable. Show all posts
Showing posts with label Adjustable. Show all posts
Wednesday, 22 March 2017
Adjustable switching power supply
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Switching Regulator L4970 series include not complicated to make his own, which need to be considered is the IC L4970 require sufficient cooling to operate in an optimal and durable. Adjustable Switching Regulator L4970 series are complete can be seen in thethe following figure .
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| Adjustable switching power supply schematics |
To set the output voltage range Adjustable Switching Regulator L4970 can be in control by adjusting the potentiometer 18KOhm tus.
Wednesday, 15 March 2017
Adjustable Voltage Current Power Supply Circuit Using IC L200
IC2 is connected as a differential amplifier and compares the signals at its two inputs.
Referring to the circuit diagram: the input comprises a mains switch, fuse, transformer, bridge rectifier and smoothing capacitor (C2).
The difference between the inputs is the voltage drop across 'current’ sensor R4. This IC feeds the current sensing input (pin 2) of the L200.
P1 in the feedback loop of the 741 is used to vary the output current of the circuit. IC1 must be mounted on a suitable heat sink as it dissipates nearly all the power of the circuit.
The reference level output from I pin 4 of IC1 goes to the voltage divider made up of R5 and P2 (this pot sets the value of the output voltage).
The power supply can quite easily be built into a case and a voltmeter and ammeter mounted on the front panel. ln view of the accuracy of the circuit these should ideally be digital meters, but virtually any type will do.
If you compare the expense and the rating of this power supply you will get a surprise, because the output voltage and current are fully adjustable between O. . . 18 V and 0 . . . 1.8 A respectively and costs have still been kept very reasonable.
Diode D5 and capacitor C1 produce a negative auxiliary voltage, which is stabilized by zener diode D6 and capacitor C4.
All this is necessary to enable the output voltage to be adjusted down to zero volts. During the construction of this part of the circuit bear in mind that the positive lead of electrolytic capacitor C4 is connected to earth! Regulation is provided by IC1 and IC2. Capacitor C3 suppresses any residual transients at the input of lC1 and it should therefore be connected as closely as possible to IC1 similarly C4 and IC2).
The negative voltage provides the negative supply for the two ICs.
Tuesday, 15 November 2016
Adjustable Symmetric 1 to 24VDC 1A Power Supply
This is the circuit diagram of adjustable symmetric 1 to 24VDC, 1A Power Supply. This power supply give dual output positive and negatif output, you can adjust both positif and negative output (+1 to +24VDC and -1 to -24VDC). This kind of power supply also known as dual polarity power supply or splitted power supply which give positive anf negatif output.
This power supply can be used for universal usage, which required not more than 1A DC current. Please take a note that you should adjust the output voltage using general multimeter or DC voltmeter before use this power supply to protect the supplied devices.
Circuit Features:
- Low cost universal symmetric power supply
- Just add a suitable transformer and a heatsink
- Ideal for e.g. op-amp applications, amplifiers, …
- Trimmers can be replaced by potmeters to allow continuous adjustment of output voltage
- LED output indicators
- Positive and negative output adjustable between 1.2 and 24VDC
- Output current: up to 2 x 1A continuous (with suitable heatsink)
- Max. input voltage: 2 x 24VAC
- Very good line and load regulation
- Low ripple
- Short circuit protection
- Thermal protection
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