Circuit diagram of AM Modulator based on triode valve/tube

Started by Robert Wilson in sci.electronics.basics11 years ago 5 replies

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...

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.


Is this device possible to make?

Started by GreenXenon in sci.electronics.basics8 years ago 14 replies

Hi: Does a device that performs the following conversions and modulations exist? If not, is it possible to construct? Prior to being...

Hi: Does a device that performs the following conversions and modulations exist? If not, is it possible to construct? Prior to being superimposed on a carrier wave, a modulator signal has its alternating-current converted to direct-current of the same frequency, amperage, voltage, and wattage. What I mean by this is that before this AC-to-DC conversion, if graphed, the current will be...


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

Started by 1jam in sci.electronics.basics7 years ago 1 reply

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...

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!


QPSK carrier frequency ??

Started by Daku in sci.electronics.basics7 years ago 21 replies

Maybe this is not a good forum to ask this question, but some electronics guru please provide some suggestions to my problem ? I...

Maybe this is not a good forum to ask this question, but some electronics guru please provide some suggestions to my problem ? I am experimenting with a QPSK modulator - demodulator system, and my question is: if the data bits are arriving at 1 MHz, what would be an ideal carrier frequency ? I think the Nyquist criteria should hold, but somewhat confused. Any hints, suggestions would be of...


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

Started by Radium in sci.electronics.basics10 years ago 268 replies

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...

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 case, a pure-sine-wave-tone] with a frequency of 20 KHz and an amplitude of 1-watt-per-meter-square...


NTC Inrush Current Limiter to limit DC motor acceleration?

Started by John Doe in sci.electronics.basics5 years ago 1 reply

What would happen if you soldered an NTC Inrush Current Limiter to the positive terminal of your cordless drill DC motor, in series with the...

What would happen if you soldered an NTC Inrush Current Limiter to the positive terminal of your cordless drill DC motor, in series with the lead coming from the pulse width modulator (PWM) trigger speed control? Would that make the drill response laggy? Does the resistance change time vary much? What is that attribute called? Thanks.


75332P MOSFET drain connected to which battery terminal?

Started by John Doe in sci.electronics.basics6 years ago 11 replies

I have a 75332P MOSFET on a cordless drill controller heatsink. I guess it's part of a pulse width modulator. The drain (flange) connects...

I have a 75332P MOSFET on a cordless drill controller heatsink. I guess it's part of a pulse width modulator. The drain (flange) connects directly to one of the battery terminals. Does the MOSFET drain go directly to the battery minus/ground terminal? Or does it go to the battery plus terminal? Thanks. -- My application... I'm desperately trying to develop a better inline ...


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

Started by Radium in sci.electronics.basics10 years ago 46 replies

Hi: Please don't be annoyed/offended by my question. I have a very weird question about electromagnetic radiation, carriers, and...

Hi: Please don't be annoyed/offended by my question. I have a very weird question about electromagnetic radiation, carriers, and modulators. Is it mathematically-possible to carry a modulator signal with a frequency of 10^1,000,000,000-to-the-power-10^1,000,000,000 gigacycles every 10^-(1,000,000,000-to-the-power-10^1,000,000,000) nanosecond and an amplitude of 1-watt-per-meter-square...