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Sci.Electronics.Basics
Sci.Electronics.Basics is a worldwide Usenet news group for discussion of electronics where there is no such thing as a stupid question. Beginners questions. Discussion of electronics education. Requests for other sources of information.

We found 135 threads matching "opamp"
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We found 135 threads matching "opamp".

Re: Special op amp "tricks"
John Fields - 19:27 10-05-07
On Thu, 10 May 2007 16:20:05 -0500, "Jon Slaughter" wrote: > Are there any tricks I need to be aware of for practical op amp circuits? > Mainly stuff to do with audio? ... Read More
Single supply opamp calculations
MRW - 15:02 18-06-07
Hi, I'm doing some more opamp calculations just to get used to opamp golden rules some more. I decided to do an ideal analysis on an inverting, single-supply opamp: http://i14.ti... Read More
Opamp preamplifier design question
MRW - 15:14 31-05-07
I'm working with these microphones because I have them already: http://www.knowlesacoustics.com/knowlesacoustics-apps/microphone_productdetail.do?product_id=12 Assuming that th... Read More
Choosing voltage opamp
Vitaliy - 13:05 23-09-06
Hello, I'm looking to add the 2nd stage to photodiode transimpedance amplifier. All I want to achieve by 2nd stage is voltage gain and capability to drive 50 Ohm loads. The fi... Read More
Conceptual design of a constant volume control opamp circuit
MRW - 16:24 30-01-07
Good day: I don't know how to word these properly. I'm really confused right now. I'll try. If I were to design a single supply constant volume control opamp circuit, would ... Read More
confused about opamp circuit from practical electronics for inventors
panfilero - 00:38 27-07-07
hello, OK, I've been breaking my head over this one for a while and just can't figure it out. It's an example from a book called "Practical Electronics For Inventors" It's basi... Read More
How does this circuit work? Is it a pre-amp?
MRW - 16:58 03-07-07
Hello! Happy 4th of July to my American colleagues! I have this circuit: http://bayimg.com/NaDlBAAbD How does it work? I initially thought that the first opamp is a mic... Read More
Calculating Input Noise Voltage
MRW - 13:07 31-05-07
I was just checking out various opamp datasheets. I encountered this opamp: http://focus.ti.com/lit/ds/symlink/tlv2784.pdf In the few lines of text, it says that the input noi... Read More
Can a capacitor let DC current through?
vorange - 22:54 19-08-07
1st question : Till now, I believed that capacitors only let AC signals through while blocking DC. But then, I saw a schematic whee they put a capacitor on the output line of an... Read More
Alternative voltage reference?
MRW - 14:28 23-07-07
Hi! I would like to know if there are other means to setup a voltage reference. I came up with this circuit: http://bayimg.com/iAeflAAbg The purpose is to have a voltage divid... Read More
How do you derive opamp equations if you flip the opamp in an inverting configuration?
MRW - 11:17 01-02-07
I'm actually curious because when I tried playing around with some circuit simulation I had accidentally interchanged the inverting and non-inverting input in an inverting config... Read More
op amp basics
lerameur - 04:20 13-05-08
hello, I am trying to understand the fundamental of op-amp. I found this link to be very interesting: courses.ece.uiuc.edu/ece486/labs/lab1/386_op_amp.pdf I would like to kno... Read More
Re: Using Frequency to voltage converter. LM2907
vorange - 22:19 23-08-07
On Aug 23, 12:34 pm, John Fields wrote: > On Wed, 22 Aug 2007 14:23:20 -0700, alfre...@msn.com wrote: > > I bought a LM2907 and im trying to build a tachometer for a RC car... Read More
What do you do with unused opamps in a quad package?
MRW - 14:01 26-07-07
Hi all. I remember posting a question before regarding leaving opamp inputs open. From what I read, the inputs should be connected to ground or some voltage source to have some... Read More
Opamp offset voltage problem
01:36 02-02-07
Hi! I want to measure the offset voltage of an opamp. First, I configure the opamp in an unity gain buffer and measure the output. The offset voltage is 64.16uV. Then, I applied ... Read More
Is it okay if I leave an opamp or comparator input open?
MRW - 22:18 24-07-07
I am curious if it is okay to leave an opamp or comparator inverting or non-inverting input open while the device is powered. Thanks! ... Read More
Re: Creating a voltage-controlled resistance
David L. Jones - 01:21 12-09-07
On Sep 12, 12:56 am, "David" wrote: > I'm testing rechargeable batteries and would like a voltage-controlled > resistance so I can easily adjust the load with a program. > ... Read More
Re: 555 timer chip tone voltage monitor ???
John Fields - 19:54 02-04-07
On 2 Apr 2007 15:14:06 -0700, "twilightzonepinball" wrote: > Hello, > > My name is Tom and I am new to this group. Please forgive my > newbieness. I am an Industrial con... Read More
Re: why do we prefer to supply voltages at the inverting terminal of an op-amp???
Ban - 03:50 10-11-06
archie wrote: > why do we prefer to supply voltages at the inverting terminal,or > conventionally known as the negative terminal of an op-amp??? We don't. Supply voltages a... Read More
Re: Simple electret "pre-amp"
Lord Garth - 20:39 30-04-07
wrote in message news:1177978474.155082.237790@e65g2000hsc.googlegroups.com... > I am using a Logitech/Labtech USB microphone which is doing an okay > job but could benef... Read More
Weird diff amp behavior?
Sam - 17:03 08-04-07
hey, i'm using a LM324 opamp configured as a diff amp. the inputs come from opamp followers, so there shouldn't be any loading issues. when i vary the input connected to th... Read More
Re: Can someone help me derive the equations for this circuit?
The Phantom - 10:56 07-06-07
On Thu, 07 Jun 2007 13:55:16 -0000, MRW wrote: > On Jun 5, 9:33 pm, The Phantom wrote: > > What datasheet is this from? > > > Hi. I got it from: > http://www.int... Read More
Re: Electret microphone question
john jardine - 19:53 16-01-07
"MRW" wrote in message news:1168885085.063760.40050@s34g2000cwa.googlegroups.com... > Good morning everyone: > > I have the following crude circuit on the breadboard: ... Read More
Re: Operational amplifiers question...
Jonathan Kirwan - 18:00 08-10-06
On 8 Oct 2006 13:44:34 -0700, a.spears@gmail.com wrote: > This is a question from my instrumental analytical chemistry text, > which oviously hasn't helped me. I looked through... Read More
Re: balanced photodiode
John Popelish - 08:33 02-10-07
sperelat wrote: > My professor gave me a circuit schematics of Balanced photodiode. > > This is my first time to study Balanced photodiode. > > It is composed of Photod... Read More
OpAmp and reference recomendations
Hammy - 17:28 04-05-08
I got tired of looking for a FET LDO that meets my line and load specs, so I'm building my own. The LP38691 is the closest I could find thats in stock and doesnt cost a lot,and... Read More
Re: Differential Amp
john jardine - 18:31 28-02-07
"Michael" wrote in message news:oylFh.3307$1E3.2571@fe3.news.blueyonder.co.uk... > Hi, > > I have a bank of 6 6V batteries and I'd like to be able to measure the > vo... Read More
Re: Voltage followers with outputs connected
John Larkin - 15:41 04-01-07
On 4 Jan 2007 10:37:41 -0800, "MRW" wrote: > Thanks Costas! > > Costas Vlachos wrote: > > MRW wrote: > > > Happy New Year! > > > > > > What happens if I connect... Read More
Re: How to amplify 15uV, 1.5MHz signal to read on Scopemeter
JimG - 12:42 27-10-07
On Sat, 27 Oct 2007 12:28:54 -0400, John Popelish wrote: > At the fundamental frequency of 1.2 kHz, lets say you want a > gain of 100. That requires at least 100*1200=120... Read More
Re: Voltage Regulator/ Voltage Reference
Jonathan Kirwan - 10:09 22-03-07
On 22 Mar 2007 04:14:07 -0700, "GraemeC" wrote: > Im trying to create a +/- 2.5V supply from a +/-5V. I have a couple > of 2.5V voltage references. Am I right in assuming... Read More
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