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The schematic diagram of the circuit used is shown in Figure 1. This circuit offers multiple advantages, the possibility of adjusting the output to a DC voltage determined according to the requirements, allowing its applications to be greater.

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If it is required to vary for example the speed of rotation of an engine, this type of circuit would be the one indicated for that purpose. It can also be used in research or teaching projects. Figure 1 – Schematic diagram of the circuit. Figure 2 – Materials Used. Figure 3 – Visualization of the voltage at the rectifier bridge output without filtering capacitors. This alternating voltage at the output of the reduction transformer is then rectified with a BRD bridge rectifier.


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If you do not have this BRD rectifier, you can use the diode configuration shown in the following diagram. Figure 5 – Configuration of Diodes Source. Subsequently, the filtering process is necessary to obtain a direct current voltage. This filtering stage is achieved in capacitors C1 and C2.

The LM is an integrated circuit that can adjust the voltage according to the needs you have. For its correct operation it must operate with resistors, capacitors and diodes. Figure 7 – LM Source. The diodes D6 and D7 protect against peaks of reverse voltage to the regulator.

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Figure 8 — Electronida with Protection Diodes Source. The following pictures shows the minimum voltage and the maximum voltage of the variable voltage source controlled through the potentiometer Figures 9 and Figure 9 – Display of the minimum voltage of the DC source.

Figure 10 – Display of the maximum voltage of the DC source. I hope that this publication has given you knowledge about the subject.

If you have any questions, please leave your comment and then I will gladly try to clarify them. I am a robot. I just upvoted you! I found similar content that readers might be interested in: Excellent post lorenzorvery useful this type of voltage source for research work.


Very interesting the use of the BRD rectifier replacing the rectifier diodes Thank you for sharing this information.

Thanks for reading and commenting wilians. Yes, it is actually more practical to build a variable voltage regulator with the electromica of the BRD.

There are designs that use rectifier diodes, everything depends on the available components. Hello friends of Steemit, I want to share with you how to build a source that supplies variable DC voltage between 1.

The maximum current value at the output is approximately 1 amp. It is important to remember that the voltage at the output of the reduction transformer remains alternating Figure 3.

LED D5 is a voltage indicator at that point.

Since this voltage at the output of the capacitors is not regulated, an LM is used to regulate and stabilize this voltage. Authors get paid when people like you upvote their post.

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