Introduction
An overload protection circuit diagram is an essential tool for any electrical system. So, this diagram shows how a device is protected from receiving too much power in a single instance. Which can cause significant damage and even failure of the device if left unchecked. By using sensors to detect over-voltage or over-current, the circuit kicks in to limit the voltage or current a device receives, thus preventing any harm from occurring. Additionally, it ensures that whatever energy is needed by the device is provided without exceeding that amount so that its efficiency isn’t compromised.
Circuit Diagram
of Overload Protection Circuit Diagram
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Working Explanation
of Overload Protection Circuit Diagram
Although the protection circuit is fairly simple, it forms an effective guard against the overload of the input of amplifiers and loudspeakers. Why these inputs may need protection now that line levels have been standardized because there are signal sources on the market that generate outputs of several volts instead of the standardized 1 V r.m.s. Also, in some applications, the loudspeaker signal is applied to the line output of a separate amplifier via a voltage divider, in which case the levels may be well above 1 V r.m.s.
The diagram shows a circuit that resembles the familiar series resistor and Zener diode. Here, however, the Zener is constructed from a small rectifier and a transistor, since commercial Zeners appear to start conducting way below their rated values, which gives rise to unwanted distortion.
The constructed Zener makes a nicely-described quandary possible and does not have an effect on alerts under the important stage. Although, configuring T1‚ as a diode reduces the number of components needed to a minimum: not even a voltage divider or potentiometer is required.
Measurements on the prototype show that the input signal remains virtually undistorted at levels up to 700 mV r.m.s. At the threshold of 1 V r.m.s., the distortion is about 0.02%. So, above this level, limiting is well-defined. The peak output voltage of the circuit is about 3 V with an input voltage of about 13 V r.m.s. If the limiting level is required to be slightly higher, consideration should be given to replacing T1‚ by three or four cascaded diodes.
Components List
of Overload Protection Circuit Diagram
- BC617 transistor x 1
- 1N4148 diode x 4
- 150 ohms resister x 1
Conclusion
Overload Protection is a key factor in keeping your electronics safe. It prevents too much current from going into the device, which could cause it to burn out or malfunction. So, this protection can be achieved using circuit breakers, fuses, surge-protective devices, and other such measures. With modern technology, it’s easier than ever before to install these features and protect your investments. Remember – an ounce of prevention is worth a pound of cure!