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  1. D

    Meg ohm resistors , are opens circuits?

    so meg ohm resistors attenuate or set the impedance of the input or output of a circuit?
  2. D

    In rush chokes on op amp inputs

    What does the inductors and capacitors do for a servo or synchro motors as an input? When a servo motor or synchro motor is shorted or creates an in rush current what does the inductors and capacitor do?
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    Meg ohm resistors , are opens circuits?

    But when you see meg ohm resistors in series this does what to a circuit? Meg ohm resistors in parallel set the impedance not meg ohm resistors in series
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    In rush chokes on op amp inputs

    The Function generator to the inputs of the chokes are at different test with these frequencys 1.) 0.1hz 2.) 4 hz 3.) 1 hz 4.) .71 hz 5.) 0.5hz 6.) .75 hz 7.) .6hz 8.) 10hz 9.) .1hz 10.) .35 hz 11.) 1.7hz 12.) 1.4hz 13.) 1.0hz 14.) 7.4hz 15.) .16hz Why are these tests done at...
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    Meg ohm resistors , are opens circuits?

    When looking at a schematic that has Meg ohm resistors in series, is this like an open circuit when a resistor in the meg ohms is in series or in parallel? Why would you want to use resistors in Meg ohms in series? I have seen resistors in Meg ohms in parallel for impedances of the inputs or...
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    Negative Trigger mode on O-scope used for?

    zooming in is called window zones on digital O-scopes yes on Digital O-scope, they have a trigger event frequency read out But the trigger event frequency read out gives the same result in either positive or negative trigger modes The Only time the Trigger event frequency changes is when...
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    Negative Trigger mode on O-scope used for?

    can you please give more examples, so i can learn from
  8. D

    Negative Trigger mode on O-scope used for?

    Can you please give some examples of when you have an event like this? what kind of measurements or waveforms that has this type of event is this called a negative event?
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    IH5011 Fet switch , virtual ground switch?

    What is the difference between a JFETS channel compared to a MOSFETS channel? are they the same or difference or what is the differences?
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    IH5011 Fet switch , virtual ground switch?

    So the channel does what? the channel is low impedance Since a MOSFET doesn't have a channel , what does that mean?
  11. D

    Negative Trigger mode on O-scope used for?

    True, but when do you use the negative trigger , for what kind of measurement? But the time period will be the same result in either positive or negative trigger, what measurement will make it different?
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    Negative Trigger mode on O-scope used for?

    When do you use the Negative trigger mode on the O-scope? and what is the negative triggering used for? When I'm measuring TTL or CMOS Logic signals, the positive or negative trigger gives me the same result, doesn't change anything. The pulse width, time period, time duration's all have the...
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    IH5011 Fet switch , virtual ground switch?

    What you mean by it's symmetrical? How are the source and drain interchangeable? what do you mean So the Diode, is a clamping diode? If the diode wasn't in the circuit , the JFET would prematurely conduct or turn on? Is a Diode high or low impedance? I thought the diode was used to...
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    Positive and Negative regulators sections are different

    You mean a Negative -6.2 voltage offset? how can the output of the negative regulators outputting a negative voltage and the diodes offset voltage is a Positive 6.2 vdc? The design did this because they put in an external tracking regulator circuit inbetween the positive regulators output to...
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    Positive and Negative regulators sections are different

    . I can't see how a series zener diode can set a fixed voltage offset, i can understand a parallel zener diode to set a fixed voltage offset but not a series If the output of the regulator is negative -10 volts, how can the series diode make the -10 volts to -12 volts? Because of the...
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    Positive and Negative regulators sections are different

    So VR2 zener diode in series makes the regulators output go more negative or have a lower or higher negative swing? how i don't get it Ok, so they are using the resistors and transistors as an external current limiting circuit and external tracking regulator But My Main question is how did...
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    IH5011 Fet switch , virtual ground switch?

    They call the IC chip a Virtual ground analog switch , but I don't get how or why would you want to use a virtual ground switch? Here is the links http://www.datasheetlib.com/datasheet/186522/ih5011_intersil.html?page=2#datasheet...
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    Positive and Negative regulators sections are different

    Why didn't they use the Current Sensing input CS on the Negative regulator? only on the Positive Regulator The connection involving R54 and R53 forms a "tracking regulator" where the negative regulator tracks the voltage that is set by the positive regulator. R54 doesn't have a direct...
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    Positive and Negative regulators sections are different

    The base dive to the pass transistor (Q19) is offset by 6.2V using VR2 (which is just a zener diode) in conjunction with R56, because the output voltage range of the 723 is not suitable for directly driving a pass transitor for negative supply regulation, - So the zener diode is used to create...
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    IH5011 Fet switch , virtual ground switch?

    IH5011 FET switch, virtual ground switch it says on the datasheets How is it a virtual ground switch? When the FET is ON or OFF the diode is always in a parallel circuit which causes current to bleed and sink take a look at the hand drawings and schematic
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