LM7815 and LM7915 in Multisim problem.

LM7815 and LM7915 do not regulate maximum + 15 and -15 volts respectively when they provide to the audio amplifier.

Here are some pictures attached.

When my audio amplifier amplifies the input signal for us will say about 15 Vrms, bad past nothing it is.

But when my audio amplifier amplifies the signal above 15 Vrms, assume to clip the signal to just 15 Vrms because I provides the audio amp with only + 15V and - 15Vdc.

However, the output reached beyond 15 Vrms brand and without distortion... but when I take a quick glance at the oscilloscope in the LM7815 and LM7915 output voltages, as you can see in the attached images, it got weirder.

What is the problem because I thought that he should cut off in the Vrms maximum 15...
In the real world, this will happen?

Instead of weighting maximum + 15V and-15 Volts by the LM7815 and ICs LM7915, it got as 29 + VCC with odd ripples...

I'd appreciate any suggestions and thoughts about this problem.

Of course, in the real world, this wouldn't happen. The LM358 is a standard op-amp and cannot output beyond the rail. In fact, clipping probably happen to +/-13... 15V since this op amp can completely switch to the supply rails. Voltage regulators never go beyond their rated voltage, except when they are broken.

I think there are some excesses in the simulation. It seems that the voltage regulators is no longer regulate anything. The ripple that see you has periods of approx.  10ms. what you see here is the ripple of the output of the rectifier (100 Hz). But I have no idea why the simulation change the supply voltage and behaves as if the regulators were bypassed. In addition, in the real world, the LM358 would not resist +/-29VDC on the power pins, I think that it is rated to +/-maximum 18VDC.

As a sidenote, I would say without going through the capacitors on the supply terminals of the op amp. Usually 10uF electrolytic + 100nF ceramic is a good choice, they should be placed as close as possible to the power (with the closest small capacitor) pins and must be connected directly on the rail of the MASS of the operational amplifier circuit.

Tags: NI Software

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