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Electrical Engineering/Questions
| Subject | Date Asked | Expert |
| power supply | 11/28/2003 | Dave Nyce |
| Q: If a filter capacitor in a full-wave power supply developes a DC short what would happen and why and ... A: If the filter capacitor shorts, a high current will flow of the amount that can be supported by the ... | ||
| transistors | 11/7/2003 | cleggsan |
| Q: I am having trouble with the FET amplifiers in the best way and what parameters to use in finding ... A: I would like to see the entire circuit and the resistance values. But we can do it. Here is the ... | ||
| circuit testing | 11/6/2003 | cleggsan |
| Q: If I have a series circuit with a DC source and say 4 resistors of varies ohms and I want to test ... A: Most circuits; that is, for the sake of uniformity, are drawn to have a common or ground line at ... | ||
| Dear sir; I intend to make... | 11/1/2003 | cleggsan |
| Q: I intend to make a device like stepper motor driver or answering machine with microproccesor or ... A: There are many hobby and circuits magazines and websites that can help you with this kind of ... | ||
| Liquid Conductivity | 10/24/2003 | cleggsan |
| Q: I would like to know what kind of liquid solutions (ex: Lemmon Juice, Baking Soda, etc.) would ... A: I think what you are asking is which liquid solution has the lowest electrical resistance and would, ... | ||
| Electrical Transformer | 10/8/2003 | Dave Nyce |
| Q: Sir, I just want to know that why the TRANSFORMERS are rated in VA ( please explain in details ) ... A: A changing magnetic field induces energy into a nearby conductor, this is called the Faraday effect. ... | ||
| Finding equivalent resistance | 10/5/2003 | Dave Nyce |
| Q: How do I find the equivalent resistance in this circuit? /\/\/ is a resistor and --- is a wire. All ... A: I'm not sure that everything lined up right as I received it, but I think I have it. Assuming that ... | ||
| Ceramic Fuse | 9/11/2003 | Dave Nyce |
| Q: How do I convert fractional Amp ranges to decimal Amperages and not risk the integrity of the ... A: I'm not sure that I understand your question. For a 1/8 amp fuse, you can use one rated for .125 ... | ||
| oscilloscope | 8/9/2003 | Dave Nyce |
| Q: I am using the multisim 2001 program to learn how to test with the oscilloscope and I am testing an ... A: Normally you would connect the A channel to the input side, B to the output side, and trigger on A. ... | ||
| impedance | 8/8/2003 | Dave Nyce |
| Q: I am having trouble understanding how to find the impedance of the tank part of a circuit with ... A: At the resonant frequency, the magnitude of the inductive reactance is equal to the capacitive ... | ||
| reduce voltage | 6/19/2003 | Dave Nyce |
| Q: Could you please tell me how I could reduce a 24v power supply, so I could operate a 12v (13 amp) ... A: This is a little difficult because of the 13 Amps. The circuit that reduces the 24V to 12V at 13 ... | ||
| conductive adhesive/epoxy | 6/7/2003 | Dave Nyce |
| Q: It was hopeless but you saved me a lot of guesswork. Same computer project, the front panel of the ... A: In an auto store, you can buy conductive paint that is used to repair rear window heaters when they ... | ||
| reuse a commercial LED display | 6/4/2003 | Dave Nyce |
| Q: I'm putting a computer into an old stereo receiver/amplifier that quit amplifying a while back. The ... A: Sorry I couldn't answer yesterday, the system kept saying that the site was busy. You have two ... | ||
| capacitors | 5/17/2003 | Dave Nyce |
| Q: If I measure a capacitor with a ohmmeter and it reads 100ohms, what will this tell me about the ... A: If a non-polarized capacitor reads a steady resistance, it is defective. If the capacitor is ... | ||
| Hi Dave, Thanks for all the... | 5/13/2003 | Dave Nyce |
| Q: The question I have today is about power generation. I was reading that when power is generated ... A: If the 3 phases are already ground referenced, then a circuit breaker would open if you shorted a ... | ||
| 230-250 volts vs 110 | 5/4/2003 | Dave Nyce |
| Q: I have a sewing machine that was made in England. It is: 230-250 volts and 0-25 amps. I have ... A: There is a surge current when starting this type of motor, so the maximum surge current is shown. ... | ||
| Micro wave | 4/8/2003 | Dave Nyce |
| Q: I am doing a science project for my eight grade class next week. I am interested in just why a ... A: The microwave energy is electromagnetic energy with a frequency of over 1 GHz, that means it has ... | ||
| sensor and switch circuits | 3/24/2003 | Dave Nyce |
| Q: I am a graduate student in Architecture and have the following question; I have a room with two ... A: I'm not sure I understand why you would need a motion detector or a computer. Unfortunately there is ... | ||
| Computer Engineering Degree | 3/11/2003 | Dave Nyce |
| Q: I am 16 and wishing to go into computer engineering. My marks arnt that high, so first im not sure ... A: An engineering curriculum includes a substantial amount of math and science. If these subjects are ... | ||
| COMPLETE discharge | 2/5/2003 | Dave Nyce |
| Q: The words printed on my rechargable battery(Ni-H) of panasonic says that "for consideration please ... A: Yes, if the battery no longer provides power, it has "complete discharge". But, if you are going on ... | ||
| one-minute timer | 2/4/2003 | Dave Nyce |
| Q: My nephew is to make a one-minute timer using household materials. Any suggestions you can give ... A: How about taking a cone-shaped paper cup (the kind from some office water coolers)and cut a small ... | ||
| High Frequency generator | 1/27/2003 | Dave Nyce |
| Q: My 12-year old daughter wants to test the hearing range of her pets for the science fair. I have an ... A: I'm afraid that it might be a little more difficult than it may seem. A sine wave can have a ... | ||
| CE | 1/21/2003 | Dave Nyce |
| Q: THESE LETTERS SHOW UP ON MANY, MANY PRODUCTS THAT I BUY NOWADAYS. IN MY EXPERIENCE, IT'S BEEN ... A: The letters CE stand for the french words Committee European. That is a set of regulations on ... | ||
| Hi Dave, I am replacing the... | 1/6/2003 | Dave Nyce |
| Q: I am replacing the cpu cooling fan on my computer and the power wires come from the fan, then are ... A: It is a ferrite ring and the wire coiling around it makes an inductor. It is for the purpose of ... | ||
| Voltage and Current - Basic Question | 1/2/2003 | Dave Nyce |
| Q: The power socket on my laptop computer is expecting 16v 2.5A. I have a car/auto adapter which ... A: "Delivering too much amps" is not a problem. The 3.8A rating of the power supply means that it is ... | ||
| plug | 11/8/2002 | Dave Nyce |
| Q: For what reason the plugs of normal electronics(e.g. radio,TV) have TWO processes(made of metal)? ... A: I'm not sure what you mean by "process". If you mean the 2 or 3 metal contacts of the power plug, ... | ||
| Operational Amplifiers.... | 10/18/2002 | John Penton |
| Q: I have done an experiment with the Operational Amplifiers as the Integrators and Differentiators. I ... A: The circuits are called integrators and differentiators because of their relation to basic calculus. ... | ||
| use of relay | 10/13/2002 | John Penton |
| Q: John, quick question. I want to use a relay in an automotive application. I want to switch 12V ... A: I don't know very much about car wiring, but I can tell you about the electronics. A relay will ... | ||
| kirchoffs law (I think) | 10/12/2002 | John Penton |
| Q: this is a sort of post a level question. there is a circuit with a diamond of resistors (R1-5) and ... A: You are correct in thinking that you need Kirchoff's Law The way I would do it is this: ... | ||
| RECORDING | 10/5/2002 | Dave Nyce |
| Q: If you have a turntable and a tape deck,and hook up the turntable to the deck line-in directly can ... A: The output from a truntable comes directly from the tone arm pickup. With a magnetic pickup, that is ... | ||
| How Hard to Drive PNP? | 10/2/2002 | Dave Nyce |
| Q: My apologies for asking a time consuming open ended question the other week. I got carried away, ... A: The gain of a transistor is usually specified to range over a 3 to 1 range at room temperature, and ... | ||
| considering electrical engineering major | 8/1/2002 | Dave Nyce |
| Q: I think I want to go into engineering, but there's so many kinds I don't know which one to go into. ... A: I think you have more opportunities when majoring in electrical engineering. Also take the courses ... | ||
| Why Current Flow So Small Here? | 7/26/2002 | Dave Nyce |
| Q: Dave, I've prototyped another part of the circuit I'm designing. The two transistors in question ... A: With your circuit, you should get about 4.3 volts to the LED circuit. If it is a red LED, it has a ... | ||
| Monitor | 7/23/2002 | Dave Nyce |
| Q: I'm not sure you'll be able to help but here goes: I have the screen from a laptop computer which ... A: Laptop computer screens are not made to communicate over standard protocols as monitors are. They ... | ||
| Advice on LED Circuit | 7/16/2002 | Dave Nyce |
| Q: Dave, I have a project where I need to flash ten LEDs in succession in a repeating cycle, like an ... A: The normal way to make a light chaser is different from your request. Usually, every fourth light ... | ||
| A simple Question | 7/1/2002 | Dave Nyce |
| Q: Sir , I am a 22 boy , an assistant Engineer of Audio Engg... Would you mind answering my ... A: When the range of measurements is too wide to use a linear scale, a logarithmic scale based on the ... | ||
| Role of Vbc in NPN Transistors | 6/20/2002 | John Penton |
| Q: I'm making headway with electronics. I have a question on NPN transistors - what happens if Vbc ... A: First point to make: you show Vbe as being 2V - in practice this will never be possible. If Vbe was ... | ||
| signal switching circuit | 6/14/2002 | John Penton |
| Q: my background is in mechanical engineering so I have a good grasp on physics and most things ... A: Sounds like a simple logic problem to me. Get some gates and arrange them to produce the desired ... | ||
| dc motor | 4/30/2002 | Dave Nyce |
| Q: The armature of a 220-V dc motor draws 15 A when operating at full load and has a resistance of 2.1 ... A: 220 volts / 15 amps is 14.6 ohms. You subtract the armature resistance from this, because this does ... | ||
| 8051 sensors | 4/27/2002 | Dave Nyce |
| Q: I'm finishing my 4th year Electronic Engineering degree next year and have to do a final year ... A: I listed myself as being on vacation last week. Somehow the website didn't pick it up. Sorry. There ... | ||
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Electrical Engineering
Answers by Expert:
Dave Nyce
Top Expert on this page
Expertise
I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.
Experience
I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.
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