![]() If voltage at pin 2 also not lower than Vcc/3 or 5 volts. The C15 10uF 25V will acts as the output monostable circuit at pin 3 will be “Low” state all time. So output voltage will be in range 7.5 +- 56 x 10mV or in range 6.94 to 8.06 volts. We are familiar IC2 is LM741-op-amp IC, they act as an amplifier of AC has the gain is 56 (R20/R19) ripple (Typically less than 10 mV.) Will enter through C14 to pin 3 of IC2. This circuit will consist of both IC2 and IC3. are the indicator regulation circuit or The size of the ripple at output. (may be 180 ohm or 200 ohm)Īnother part of the circuit that we have not mentioned. For example : If R24 More value, R11 was increased. We will see that if use R24 error, will cause the current limiting slow or fast. The comparators limit current will work, make pulse that go to control the Q1 narrow. When current through R24 of 5.6 A will cause the voltage is 0.56 volts at pin 16 of TL494. The current of all load will flow through R24-resistor and will cause voltage drop across R24. The R24 0.1 ohm 5 watts will be the load current detection. both VR1 and R16 Changes may be important is the ratio of VR1/R16 must be 100/6 to take 100K to 5.6K, or 50K and 3K time. The C10-capacitor will reduce ripple at outpu. which can adjust by rotate VR1-2K that divide voltage on R16 are 120ohm, R15 is 4.7K that will ? input current of error amp circuit (pin 1 of TL494) Then M2 is a voltmeter to measure the voltage across load or output voltage of circuit. The M1-meter are ammeter that will measure the current through the load circuit. discharge to C6 and C7 when switch- SW1 “OFF” or No load. will reduce undulation of Overshoot voltage. are current draw of the circuit or load, can maintain regulated when no load, 2. The R14 560 ohm 5 watt serves primarily, 1. LM338 5A Variable regulator Better life with high current in same voltage 1.25V to 30V. because will be cause the output short circuit when Q2 “ON” cause Q2 damaged immediately.) The common diode rectifier will not work. The D2 use as the fast recovery diode of Toshiba number 6GB 11 (D2 must have special properties than plain diode is able to flow and stop flow quickly. Both C8 and C9 acts connected via a high-frequency signal. ![]() Both C6 and C7 (or C7 will Consists of 330uF 75V – two capacitor connect parallel. In the primary circuit of the switching section that coil L1 is 0.5 mH. (because they will be discharge through R8) ![]() Then voltage at pin 3 will reduce slowly normal state. (because C5) The Q2 will be partially no. But if the voltage at pin 3 have a higher value in first time. So, cause output of the within comparator circuit are “High”. then at pin 3 of TL494 will be have a low voltage. When push switch SW1 normally to working. They R8, R9 and C5 between pin 2 and pin 3 that will be network that be editor Q2 work with narrow pulse before (are Q2 partially ON”) so can reduce pull of the output current. When push the S1-power switch ON, Both capacitors C1 and C2 will discharges through the R1-resistor. When through the D1-bridge rectifier then will be C1 and C2 are filter to smooth a fluctuating signal(AC Volts). The SW1 is ON/OFF switch of this projects. the AC 220 volts when through a T1-transformer then will be AC voltage 36V. How this circuit worksįrom circuit in figure below. And We still use the MJ15004-power transistor to amplify currents up to 5A. Widely used in the computer power supply circuit and the motor control circuits The advantage is high efficiency. To understand and be able creating the project out. Ideal for those have basis of this nature circuit. than normal linear type are they are a small, energy saving and low heat. Because is a switch mode type that is Technology available high performance. Today I suggest examples as the variable voltage power supply circuit that can adjust output from 0-50volts at 5A.
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