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    Origianl Shot noise paper

    Does anyone has a pdf of original Shot noise paper by Schottky-: AU: W. Schottky TI: Über spontane Stromschwankungen in verschiedenen Elektrizitätsleitern SO: Annalen der Physik VL: 362 NO: 23 PG: 541-567 YR: 1918 CP: Copyright © 1918 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim ON: 1521-3889 PN...
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    Temperature Sensor for 4 Kelvin

    Hi , I need to do some gain measurements of my MESFET amplifier at around 4 Kelvin. To measure the temperature I was hoping to buy Silicon diodes from Lakeshore - just realized that they are very expensive ($500 bucks for the calibrated ones). Is there a way i can rig up something in the lab...
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    Coax for vacuum application

    Hi, Does anyone know if i can get some kind of caox cable for UH - vacuum applications?
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    Where can I get 3Sk164 and 3SK166?

    need 3Sk164 and 3SK166 Hi, i need the sony devices which are obsolete now, 3SK164 and 3SK166. Please, does anyone know where I can get may be 10 of them. thanks
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    GaAs FET with linear channel

    I have to design a preamp using GaAs FETs which will sit in a very strong magnetic field 14 Tesla. The magnetic field (B) if at an angle to the channel will exert a force to the flow of charge carriers from Drain to source. To avoid this I plan to align the FET channel in the direction of the...
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    Killer Input capacitance

    hi, I am designing a transimpedance amplifier which needs to amplify around 100pA of current to few mVs , the signal frequency is from 10Khz to 10 Mhz. I start with a 1M ohm resistor to convert this current into voltage and use a FET in a source follower configuration for pre-amplification. My...
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    Will Groud Plane capacitance delay my digital signal?

    Groud Plane capacitance I am designing a printed circuit board that has traces carrying TTL triggers from a national instrument timing board. My question is : will it be a bad idea to put a ground plane in the secand layer. I was thinking the capacitance of the traces due to this ground plane...
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    Orcard Layout plus foot print library

    orcard hi, I need a list of footprints available in layout plus standard libraries, so that i know which footprints i have and which ones i don't. I know how to make footprints myself but it would be waste of time to reinvent the wheel. In the Users manual they keep refering to "OrCAD Layout...
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    Protecting my Analog output card

    hi guys, I have an Analog output card which is generating +/- 10 volt, and drives a metal plate in my instrument. This metal plate which is basically a load capacitor of around 20 pF, can sometimes have transient voltage from pick up. I want to protect my AO signal channels from these high...
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    Help me make a simple charging circuit for a motorcycle battery

    Hi Guys, My motorcycle battery just died. It shows 9 volts instead of 12 volts. I need to rig up a simple charging circuit in the lab. I have dc power supplies and resistors and some npns. Please help
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    Differential amplifier Question

    differential amplifier question hi, I am making a differntial amplifier, and the circuit i am trying is attached as a Pdf. In my simulations when i probe the voltage at the collector of Q1 and Q3 i see they are in phase. If i remove the second stage (AD797) they are fine in quadrature with each...
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    How to get access to SOIC chip pins without PCB tooling machine?

    I am doing a small diff amp project where i bought CA3127 which has matched npns. Now i realized that they are in 16 ld SOIC form. I do simple breadboard prototyoes in my lab. I don't have access to any pcb tooling machine. Can anyone suggest me some sort of zig which i can make in lab which...
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    High voltage traces on PCB

    high voltage pcb Hi, I want to calculate analytically how much spacing is to be kept between the traces with high voltatge to prevent the arcing. Does any one has references of a text book or articles. thanks
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    Candence Layout Plus (copper pour)

    hi, I have made a pcb and want to put a ground plane on the top layer. I created a copper pour obstacle and set it to attach to the ground net. My problem is the pins which are ground, connect to the plane with very thin traces approximately 10 mils. For example in the attached picture pin J2...
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    Candence Layout Plus (copper pour)

    hi, I have made a pcb and want to put a ground plane on the top layer. I created a copper pour obstacle and set it to attach to the ground net. My problem is the pins which are ground, connect to the plane with very thin traces approximately 10 mils. For example in the attached picture pin J2 on...
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    Biasing the cascode pair

    hi, I came across this circuit while studying low nose differential amplifiers. The cascode JFETs which are connected has their Gate tied together to the source of the input FETs. I don't understand how this biasing works. The JFETs have the VGS(off) ~ -0.5. There is no way all the FETs are...
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    Oscillator not oscillating

    I built this circuit, which is a high voltage oscillator circuit from a published paper, on a PCB. I have connected a tuning capacitor equal to 500 pF. When probing the one end of the 10 turn coil, i measure DC voltage approx. 100 volts. Why the tank circuit formed by the seconday coil and the...
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    Automatic Gain Control Stage

    I found this attached schematic as part of an oscillator circuit. It is supposed to be an AGC stage in which V3 is a portion of the ac output of the oscillator (through inductive coupling) which is being fed to the AGC. The output of the opamp controls some bias voltage which controls the...

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