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Modulator


Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.

We found 61 threads matching "modulator"

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The most relevant threads are listed first

Re: Is this device possible to make?

John Nagle - 2009-05-11 02:23:00
GreenXenon wrote: > When the modulator signal’s peak-to-peak amplitude increases, the > carrier’s frequency increases such that – in numbers – the frequency > of the carrier wave [in Hz] equates to the amplitude [in watts-per- > square-meter] of the modulator wave. I think you're desc...Re: Is this device possible to make?

Circuit diagram of AM Modulator based on triode valve/tube

Robert Wilson - 2007-01-07 07:42:00
Hello, I would like to find a circuit diagram of an AM Modulator scheme based on a Triode Thermionic valve/tube. I have a SPICE package that has a Triode valve as a component. The package i'm using is Simetrix, from Cadence. Can anyone help please? Regards, Robert. ...Circuit diagram of AM Modulator based on triode valve/tube

Re: Switch terminology?

Lord Garth - 2007-03-15 20:15:00
"Esther & Fester Bestertester" wrote in message news:0001HW.C21F291D0013AE32F01826C8@news.sf.sbcglobal.net... > > What is it you are trying to design? Maybe we can suggest some > > all electronic ways to switch the signals. > > Small DC motor speed control. Switching resistors or di...Re: Switch terminology?

Re: Help needed designing square wave osc (555)

Baron - 2008-07-11 11:03:00
Kasterborus Inscribed thus: > Many thanks to all who replied - the circuit with 120K/0.1uF works > very well. > > I want to feed this into an audio ring modulator circuit - (2 > transformers, 4 Ge diodes) My carrier is coming in from a mic pre-amp > - which when I checked on my scope ...Re: Help needed designing square wave osc (555)

can I run MC1496 (modulator) w/ 80MHz carrier?

1jam - 2010-08-03 01:11:00
Hi, for reference: http://www.onsemi.com/pub_link/Collateral/MC1496-D.PDF Can I run this chip with an 80MHz carrier? I'm trying, but the output is very weak. The datasheet isn't clear to me. thanks! ...can I run MC1496 (modulator) w/ 80MHz carrier?

Re: From 12V DC to 5+ V DC How to?

default - 2006-08-25 11:20:00
On 25 Aug 2006 02:15:12 -0700, trezaei@gmail.com wrote: > Will this work? > > http://www.grandhobby.com/25aelbrescsp.html Probably no That is a good "cheap and dirty" way to reduce the power. They don't cut down the voltage they just switch it on and off rapidly - the average power is...Re: From 12V DC to 5+ V DC How to?

Re: Interesting Tesla coil

Rich Grise - 2007-07-06 21:36:00
On Thu, 21 Jun 2007 08:29:29 +0000, steamer wrote: > --Would be interested to know more about how this thing works; i.e. > would a desktop version of it be as ...vocal? > http://www.hauntedfrog.com/gt/movies/2007/duckon/SingingTeslaShow.html So, when's he going to connect the modulator ...Re: Interesting Tesla coil

Re: modulation

jasen - 2006-09-15 17:58:00
On 2006-09-15, gopal_219@rediffmail.com wrote: > does r/f input ,audio input willmake modulation? if it's a modulator, yes. > whati s the range of r/f input? I can't see from here, what are you looking at. Bye. Jasen ...Re: modulation

Re: fm radio

Homer J Simpson - 2007-01-13 14:48:00
wrote in message news:1168708094.280014.240470@11g2000cwr.googlegroups.com... > thanks for the replay.. > can you tell me the exact construction of the transmitter circuit.. > thankyou.. http://www.arrl.org/catalog/?item=9458 http://www.electrokits.com/kits/10w/fm/modulator/fm/c...Re: fm radio

Re: What range should my POT be?

JeffM - 2008-11-22 03:40:00
kayvee wrote: > [...]motor[...]powered by a 24VDC power supply, > and I would like to vary the voltage going to this motor[...] > > V+ ---+---------------+ > | | > P /c > O T \e > | | > Gnd --+---[M...Re: What range should my POT be?

Re: signal generator circuit

Phil Allison - 2007-02-05 22:50:00
"kell" > > the multivibrator doesn't necessarily have to run at the signal > generator's intended output frequency. Check this out: > http://www.electronic-circuits-diagrams.com/generatorsimages/1.gif > The discrete multivibrator on the left of the diagram obviously runs > at a fracti...Re: signal generator circuit

Re: Amplitude-Modulation Synthesis

Bob Masta - 2006-09-12 09:01:00
On 11 Sep 2006 20:43:20 -0700, "Radium" wrote: > Hi: > > I know of many types of synthesis for music. I am curious about two > types -- FM and AM. > > Does FM synthesis have any advantages over AM synthesis? If so, what > are those advantages? > I am not aware of any popular AM sy...Re: Amplitude-Modulation Synthesis

Re: Cable box + cable feed

Sjouke Burry - 2008-01-14 12:50:00
reqluq wrote: > "AJ" wrote in message > news:-86dnf97W65iiBfanZ2dnUVZ_uCinZ2d@comcast.com... > > Are you connecting the cable through a splitter then to the tele and cable > > box??? cut > No only one..That's why I would like to use a mixer/splitter to feed the tv > with the cabl...Re: Cable box + cable feed

Re: RF to optical converters

John Larkin - 2007-04-27 23:59:00
On 27 Apr 2007 13:28:19 -0700, "mike7411@gmail.com" wrote: > I was wondering if someone can help point me towards some information > on how RF to optical converters and vice versa typically work. I am > wondering if they generally involve some kind of analog to digital > conversion, or if...Re: RF to optical converters

Re: What type of bulb to use with my color organ ?

Jamie - 2008-02-04 19:12:00
sku_dave wrote: > I'm making a kind of light tower with 2" clear acrylic rod (3x 6' > tall), and putting lights underneath that'll be plugged into my color > organ to react to music. > > I'm reading led bulbs are either on or off (true for all?) - obviously > not giving the same visual ...Re: What type of bulb to use with my color organ ?

Re: Frequency vs Phase modulation

Andrew Holme - 2006-12-17 05:20:00
"Rich Grise" wrote in message news:pan.2006.12.17.00.10.21.192546@example.net... > I was just sitting here ruminating, and remembered something I'd read > in some Ham magazine a millennium ago, about how phase modulation is > easier to do than FM, but they wrote that it has a "tinny" sou...Re: Frequency vs Phase modulation

Re: need to measure low freq. DC waveform

Yukio YANO - 2008-05-18 12:06:00
mattyg1884@hotmail.com wrote: > i need to measure a low frequency waveform from a DC circuit (voltage > up to 200mV). I need a sample rate of around 10Hz. to buy an > oscilloscope for this is a total overkill. I was thinking of using the > soundcard, but then realised it's AC coupled. any su...Re: need to measure low freq. DC waveform

Re: Varying a pen laser voltage with audio signal how? tia sal2

ehsjr - 2007-03-26 14:21:00
John Fields wrote: > On 26 Mar 2007 10:19:36 GMT, jasen wrote: > > > > On 2007-03-25, John Fields wrote: > > > > > > > Other than physically moving the laser back and forth (toward and > > > away from the receiver) at an audio rate, just how would you propose > > > going about ...Re: Varying a pen laser voltage with audio signal how? tia sal2

Re: FM stereo transmitter?

Joerg - 2006-12-05 19:54:00
Bob Masta wrote: > Here's the scenario: I'd like to be able to > play an audiobook on my living room stereo > where my wife would be listening as she > works on her projects, but I want to be able > to listen at the same time on a Walkman > while I'm working in the basement, etc. >...Re: FM stereo transmitter?

Re: How do you make a closed signal loop?

John Larkin - 2006-09-09 22:40:00
On 8 Sep 2006 21:30:01 -0700, calcat@fastmail.fm wrote: > Hi Everyone, > > Is it possible (in theory) to capture a signal in a closed loop, > keeping the signal stable and periodically travelling around the loop? > In theory, yes, but in practise, no. An analog signal will rapidly degra...Re: How do you make a closed signal loop?

Re: Audio Up/Down Conversion

Jamie - 2007-06-08 20:17:00
Sjouke Burry wrote: > BobaMosFet wrote: > > > On Jun 8, 10:47 am, John Fields wrote: > > > > > On Fri, 08 Jun 2007 05:15:51 -0700, BobaMosFet > > > > > > wrote: > > > > > > > Does anyone have a schematic (or link to one) of a circuit that will > > > > convert very low (b...Re: Audio Up/Down Conversion

Re: Buffered FET logic, Direct coupled FET logic tutorial

Tim Shoppa - 2010-08-13 08:46:00
On Aug 11, 3:45=A0am, Daku wrote: > Could some electronics guru provides some URLs for authentic buffered > FET logic and/or direct coupled FET logic ? Thanks in advance. Boki, is that you? :-) Two of my favorite Boki posts from the golden oldies section: http://groups.google.com/gro...Re: Buffered FET logic, Direct coupled FET logic tutorial

Re: Wanted: Capstone Project Suggestions

Rich Grise - 2006-09-12 19:09:00
On Tue, 12 Sep 2006 14:22:01 -0700, fcache wrote: > > I'm taking a non-calculus based Electronics I course at a local > community college using Malvino's text, _Electronics Principles_. My > goal is to work for hospitals repairing medical equipment. This > semester we are covering the t...Re: Wanted: Capstone Project Suggestions

Re: I am building a simple FM radio transmitter

Rich Grise - 2008-04-10 15:15:00
On Thu, 10 Apr 2008 18:47:26 +0100, Aly wrote: > "qoo" wrote in message > news:d896bc63-127c-4dcb-962c-3ce5f89bcfca@s13g2000prd.googlegroups.com... > > Well, its not so simple for me actually. Thats the project I have > > Actually, for all concerned (regardless of the homework aspect)...Re: I am building a simple FM radio transmitter

Re: troubleshooting steps

Bob Myers - 2007-10-01 14:16:00
"Roy" wrote in message news:lq02g35opt2f4l4vpd9lqq6j2o0ktqh6s8@4ax.com... > This is a wide open question and I expect I'll get alot of varying > opinions, but here goes. What would you consider to be the 4 or 5 > most crucial steps in electronics troubleshooting? 1. Describe, as ful...Re: troubleshooting steps

Re: How is the amplitude component of an audio signal encoded in an FM signal?

2007-12-15 00:30:00
On Dec 14, 9:19 pm, wrnchb...@hughes.net wrote: > In the given explanations of basic FM that I have read, I can > understand how a single audio tone modulates the carrier frequency as > the carrier shifts frequency as it follows the audio wave form. How > are dynamics in amplitude of t...Re: How is the amplitude component of an audio signal encoded in an FM signal?

Re: Load Capacitance

Tim Wescott - 2010-02-17 22:39:00
On Wed, 17 Feb 2010 20:04:16 -0500, Wayne wrote: > Hello Everyone, > > I have a couple of surplus crystals, 10.7 MHz. Is there a way to find > out the Load Capacitance for them ? The people I bought them from don't > know. > > What I am doing is a "Can I make this work" project. I...Re: Load Capacitance

Re: How does this circuit work? Is it a pre-amp?

Bob Masta - 2007-07-04 08:07:00
On Tue, 3 Jul 2007 23:21:10 +0100, "Andrew Holme" wrote: > > The circuit is an FM transmitter. U7A is an isolating amplifier. The 1nF > capacitors are there to prevent RF feedback causing instability. > I'm totally mystified by this circuit. If it really is an FM transmiter, th...Re: How does this circuit work? Is it a pre-amp?

Re: Replace magnetic with optical

Sam Goldwasser - 2007-04-06 13:24:00
"Fleetie" writes: > BogusID wrote: > > What about a 3 dimensional media, like an optical version of the old bubble magnetic memory with X/Y/Z read/write vectors? > > Perhaps then we could have small removable 1/2 or 1 inch cubes that contained huge volumes of data... > > Holographi...Re: Replace magnetic with optical

Re: My favorite analog audio storage = B&W variable-density optical track of old films

John Larkin - 2008-04-09 23:28:00
On Wed, 09 Apr 2008 19:38:00 -0700, "Green Xenon [Radium]" wrote: > John Larkin wrote: > > On Wed, 09 Apr 2008 18:27:04 -0700, "Green Xenon [Radium]" > > wrote: > > > > > Hi: > > > > > > My favorite analog audio storage medium consist of the optical > > > equivalent of magn...Re: My favorite analog audio storage = B&W variable-density optical track of old films

Re: Is a parallel amp the same as a balanced amp?

legg - 2008-05-20 16:11:00
On Tue, 20 May 2008 11:12:04 -0700 (PDT), Nick wrote: > On May 19, 11:53 pm, CampKohler wrote: > > On May 19, 5:41 pm, Nick wrote: > > > > > Hello all, > > > > > The differences between a parallelamplifierand abalancedamplifier > > > is rather confusing.  Are they the sam...Re: Is a parallel amp the same as a balanced amp?

Re: Generation of Ultrasound in the Megahertz region

redbelly - 2007-03-31 21:18:00
On Mar 30, 9:46 am, "Joe" wrote: > Hello to the group, > > Does anyone know how I could generate sound waves in the Megahertz > region? I would like to do a demonstration for my class on the Bragg > Effect (a non linear optical effect where a high frequency sound wave > will couple wi...Re: Generation of Ultrasound in the Megahertz region

Re: Scanning for a bug..

Michael Black - 2007-01-23 00:22:00
"Michael A. Terrell" (mike.terrell@earthlink.net) writes: > BobG wrote: > > > > The KGB had a mole at the construction site of the US embassy in Moscow > > and they filled the concrete beams with little capsules that formed > > resonant cavities. When the spooks outside beamed some microw...Re: Scanning for a bug..

Re: What exactly is a four symbol pulse?

2007-11-21 23:30:00
On Nov 18, 11:30 pm, MRW wrote: > Hi! I'm reading this article:http://www.broadcast.net/~sbe1/8vsb/ 8vsb.htm > > I'm trying to get myself familiarized with Digital TV broadcasting. On > that page, there is this sentence: > > "The ATSC segment sync is a four symbol pulse that ...Re: What exactly is a four symbol pulse?

Re: 3vdc motor PWM problem

jasen - 2006-10-02 04:21:00
On 2006-10-01, John Fields wrote: > This is interesting to me, so I'm going to build one. :-) > > I'll use a drop detector (either reflective or transmissive IR, I'm > not sure which, yet) and white LEDs to strobe the drops, which I'll > probably leave clear right at first. > > ...Re: 3vdc motor PWM problem

Re: reliably testing diodes in circuit ?

Dave Platt - 2007-11-17 11:27:00
> while checking diodes **in circuit** with diode setting on DMM > > i ran across a unexpected results where diode test at (.567 V) in > one direction then swap probes around and expect (0 V) but i > get unexpected (1.897 V) reading. > > are there conditions where this is a valid reading...Re: reliably testing diodes in circuit ?

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency

Radium - 2007-06-29 22:41:00
Hi: Please don't be annoyed/offended by my question as I decreased the modulation frequency to where it would actually be realistic. I have a very weird question about electromagnetic radiation, carriers, and modulators. Is it mathematically-possible to carry a modulator signal [in this ...AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency

Re: How can I vary an Ultrasonic Mist Maker vibration using a sound card tia sal2

Joerg - 2008-06-15 17:16:00
amdx wrote: > "amdx" wrote in message > news:cad8f$48545362$18d6b40c$19391@KNOLOGY.NET... > > "sal2" wrote in message > > news:pan.2008.06.14.02.10.52@sal2.com... > > > Greetings All > > > > > > I would like to vary an ultrasonic mist maker like this one > > > http://www.phys...Re: How can I vary an Ultrasonic Mist Maker vibration using a sound card tia sal2

Re: Laser diode module and audio amplifier tia sal2

default - 2008-01-07 17:28:00
On Mon, 07 Jan 2008 17:00:37 GMT, sal2 wrote: > Laser diode module and audio amplifier tia sal2 > > Greetings All > > I have a laser diode module with the datasheet of > output wavelength 640-660nm > that is powered by 3Vdc I've created a simple laser communicator > following the in...Re: Laser diode module and audio amplifier tia sal2

Re: Joule Thief - still not working....

John Larkin - 2009-07-26 18:52:00
On Sun, 26 Jul 2009 21:20:30 GMT, Jon Kirwan wrote: > On Sun, 26 Jul 2009 13:08:45 -0700, John wrote: > > > > > A TinyLogic schmitt trigger and a SOT-23 mosfet will make a nice > > controllable-PWM boost thing. It only needs a 2-terminal inductor, > > which simplifies life. > > Um...Re: Joule Thief - still not working....
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