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PhysicsForums How to measure electrical frequency?  
10:02 11-Dec-07   [Replies: 1, Views: 11]    By: Unnamed
in f to V converter, input is frequencies . Is that electrical or Mechanical frequency?...
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PhysicsForums 2 Stage JFET amplifier  
04:15 10-Dec-07   [Replies: 0, Views: 2]    By: Unnamed
Hey guys, I am curious on how to set up a 2 stage JFET amplifier. I've reviewed some analysis on 2 stage BJT amplifiers as well as 2 stage BJT/JFET amplifiers but I cannot find anything on how to ...
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PhysicsForums Design a bandpass filter  
03:13 7-Dec-07   [Replies: 0, Views: 2]    By: Unnamed
Hey guys. I have a problem here that I need help with big time, but I have no clue where to start. Can anyone help me get started? I attached the problem below....
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PhysicsForums Relay Chattering  
12:09 4-Dec-07   [Replies: 4, Views: 52]    By: Unnamed
What causes relay chattering and what can be done to prevent it?...
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PhysicsForums Automotive electrical contacts  
02:01 4-Dec-07   [Replies: 3, Views: 23]    By: Unnamed
Hi, I had auto lights failing and instead of let the mechanics supply me with a brand new switch unit at a great rate, I delved into the switch unit to see what was happening. I noticed a lot of o...
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PhysicsForums VHDL Code: Testing Equality of Vectors  
00:21 2-Dec-07   [Replies: 0, Views: 25]    By: Unnamed
Hi all, I have the following code: Quote:...
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PhysicsForums AC to DC Power Supply Ground Connection  
14:18 29-Nov-07   [Replies: 4, Views: 66]    By: Unnamed
Hello, I opened up an AC to DC power supply today to see where they connected the earth ground wire and I found that it's connected to the negative side (labeled V-) of the DC output. V- is also c...
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PhysicsForums Advice For Going Into Electrical Engineering  
00:40 29-Nov-07   [Replies: 1, Views: 21]    By: Unnamed
I'm a high school senior at my school and I have decided to pursue a career in electrical engineering. I was wondering what kind of advice you guys would give me to guide me in my path of learning in ...
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PhysicsForums fermi levels in p-n junction under voltage  
01:27 27-Nov-07   [Replies: 24, Views: 369]    By: Unnamed
I understand that for a semiconductor p-n junction under zero voltage, the Fermi level is constant throughout the junction because that is the condition for a system in thermodynamic equilibrium. ...
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PhysicsForums Electrical Energy calculation  
02:45 23-Nov-07   [Replies: 3, Views: 70]    By: Unnamed
How do I calculate the consumption of energy for an apparatus with these characteristics: 230V / 50Hz / 1Ph ?...
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PhysicsForums Circuit Question  
17:33 20-Nov-07   [Replies: 4, Views: 17]    By: Unnamed
circuit.bmp [http://www.physicsforums.com/attachment.php?attachmentid=11641&d=1195598084]> Hello everyone, I am trying to learn about electrical circuits for a physics class. I have at...
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PhysicsForums Loadcell Shield Connection  
13:56 19-Nov-07   [Replies: 4, Views: 78]    By: Unnamed
Hello, When is it OK to connect the shield wire of a loadcell to the 0V rail vs chassis ground? I have seen it connected to the 0V rail but other sources seem to indicate that it should be connect...
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PhysicsForums Loop and Nodal Analysis  
11:56 17-Nov-07   [Replies: 2, Views: 96]    By: Unnamed
Could u guys reccomend some e books for loop and nodal analysis . I am having some problems implenting the methods to solve poblems. or may be u could give me some tips...
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PhysicsForums Clamping Circuits  
05:40 17-Nov-07   [Replies: 0, Views: 12]    By: Unnamed
I have a negative clamper with a simple capacitor and a single diode. This circuit clamps the Sinusoidal wave (2V- peak to peak) to the negative peaks and makes the output (0 to 4V) .. My question ...
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PhysicsForums Small Tracking devices  
19:13 13-Nov-07   [Replies: 4, Views: 34]    By: Unnamed
Does anyone know of a very small tracking device or tag that can be tracked .5 mile or more and the size of watch battery or smaller. I looking for such a device for dog tracking....
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PhysicsForums Signal and data processing  
09:40 12-Nov-07   [Replies: 0, Views: 2]    By: Unnamed
>Hii everybody Am having some problems and facing some dificulties concerning, the topic of operational amplifiers and more precisly feeding back with the inverting and non inverting terminlas, ...
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PhysicsForums Determine Resistances in the Circuit  
02:37 11-Nov-07   [Replies: 3, Views: 41]    By: Unnamed
A current is driven from a current source as shown attached. Determine the branch currents if the circuit is configured for maximum power transfer. Does anyone know how to solve this problem. Any help...
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PhysicsForums Finding the right ADC  
14:05 8-Nov-07   [Replies: 5, Views: 131]    By: Unnamed
Hello All, I'm working on a circuit that can detect a voltage input and convert it to a digital value that my micro-controller can read. But I'm having some trouble finding the right Analog to Dig...
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PhysicsForums Mass Vibrator using a Neodymium cylinder  
12:45 7-Nov-07   [Replies: 0, Views: 3]    By: Unnamed
This is an electrical question but bare with me for some background. I have a project creating an epoxy based granite material. The sphere packing density is quite high with aggregate sizes fr...
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PhysicsForums Help for a DIY circuit  
23:08 6-Nov-07   [Replies: 9, Views: 144]    By: Unnamed
Hello to all, I need to be able to power 10 laser pointers at the same time all running from one adapter. Each laser is normally powered by 3 LR44 batteries, wich are 1.5v each (I dun...
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PhysicsForums Amps  
19:55 2-Nov-07   [Replies: 4, Views: 67]    By: Unnamed
Hi guys, I need to build a REALLY simple amp for a friend. I only want to use a resistor and a transistor plus the normal stuff(battery and speaker). Please help. Thanks in advance, Circuit M...
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PhysicsForums motor as switch (dc transformer)  
10:08 2-Nov-07   [Replies: 8, Views: 79]    By: Unnamed
here's an idea i just came up with, it's to run DC into the primary of a tranformer and get a constant output: place a brush motor (like the ones in model airplanes/cars) in series with the primary co...
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PhysicsForums How to Calculate Temperature & Time of Heating Element  
04:19 1-Nov-07   [Replies: 0, Views: 29]    By: Unnamed
Heating Wire having the following Data : SWG 16(1.63mm) Specific Resistivity = 1.45 ohms-mm-3 Density = 7.1 gm-cm-3 Resistance = 0.685 ohms/Meter Weight = 15 Gram/Meter (a)Please help me...
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PhysicsForums Ammeter to help the circuit work!!!  
12:05 29-Oct-07   [Replies: 4, Views: 76]    By: Unnamed
I have connected one IC circuit which is taking from a remote control car. Then I connect it to the a power supply which is 9V. It doesn't work in the beginning. But I don't know why it works after I ...
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PhysicsForums Why? question about optical encoder  
21:20 28-Oct-07   [Replies: 2, Views: 23]    By: Unnamed
Why is the outermost ring of an optical encoder the least significant bit? Is this somehow related to frequency?...
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