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The feedback is -ve. I made a mistake while drawing the schematic. However, what you say about the fact that same Opamp with two different sets of same input voltages (0.6V+0.6v & 0.9V+0.9V) provide different outputs. Shouldn't the output be same? That is, in order to get 5V for both opamps is...
Hi,
Background: The Opamp OPA547 is used in 2 identical but separate units of power supplies. One unit is functioning properly whereas the other one is defective. After comparison it was figured out that every pin of these two opamps has the same value/voltage except the input & output pins...
Hi,
I have a question regarding the sub section of a power supply.
Background: I have two similar power supplies one is functioning whereas the other one is not functioning. The functioning one can output variable dc voltage from +(0 - 20)V. The nonfunctioning power supply can only deliver -4V...
In the first case the voltage is fixed and -ve (it must be +ve). The supply gives an output of -4V. It should be able to give variable dc voltage in the range of +(0-20)V. Can you tell why it is -ve? Also what do you mean by control circuitry?
In the second case the shaft of the potentiometer is...
Hi,
Two power supplies are malfunctioning. Both have problems with their variable DC output voltages. The DC output voltages can be varied using a potentiometer.
The first supply gives a fixed negative output (which is much lower than the maximum +ve output obtainable) for all possible values...
Hi,
I have 7 measured values of IC for 7 different values of IB and now I want to calculate βdc and therefore I have to divide IC by IB at the operating point. However, what I don’t understand is how to determine operating point. Or stated otherwise which of the 7 values of IC and IB correspond...
Hi,
I have to make a 2 layer PCB and have to use a machine which can only drill and mill the material to be used for making PCB. The material to be used has copper on the top side and bottom side and between these sides is a substrate. What I don't understand/know is how to make conducting vias...
Hi,
I have some questions regarding circulators.
1. What is the formula of directivity in terms of s-parameters for circulator?
2. What are the important factors like insertion loss etc. related to circulators and what are their formulas?
3. If the performance of circulators has to be checked...
Hi,
If the source is connected to the load in such a way that maximum power is transferred to the load. And now if I change the length of transmission line between source and load then the maximum transmission of power is still possible or not? Also if I change the phase of S11 of the line...
Hi,
I just want to know the behaviour of a Quadrature Hybrid Coupler if the signals of equal power but with different phases are applied at the output of the coupler as shown below.
**broken link removed**
Hi,
I want to understand the nature and concept of 50 Ohm system. Please view the image below to have an idea of the context of this question.
https://oi45.tinypic.com/f5877l.jpg
Hi,
I have a question regarding the response of two of hybrid's ports. Please look the figure below for the question.
https://oi46.tinypic.com/5ytgt0.jpg
Hi,
I have to measure drain and gate voltages of power transistors at around 120 MHz. The transistors' casing are soldered on PCB and the PCB has other circuitry also which is causing great trouble in measuring the drain and gate voltages at the time of transistors' functioning. As expected...
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