gain control for 100Mhz

[navidrct]

then you mean voltage gain control that i said before its so expensive

OK, could you please define expensive? 1 USD? 3 USD? 5 USD? 10 USD? 20 USD?

in my country a VGC is about 15 US . in large scale it is expensive 

[navidrct]

It seems to me that what you need is an adjustable 50R output amplifier for your function generator.

u mean digital resistor?
if yes
that wont work cause that cant support 100 MHz

Did you ever look at a schematic of a function generator ?

yes . i have Agilent schematic of a function generator that its so old and complicated
do u have any useful?

[navidrct]

Please post in the beginner section, you seems to be a beginner.

Gooooood for U that ur not beginner 

[oldway]

You make everybody crazy here because you ever can't especificate what you want !

[Fungus]

we have no idea what you're actually doing so we can't help.

I declare this thread finished until you provide a schematic.

i want variable voltage control amplifier not just an amplifier 

Variable voltage control of WHAT? 

PS:  yourself

[oldway]

yes . i have Agilent schematic of a function generator that its so old and complicated
do u have any useful?

To amplifier a 100Mhz square wave, you need at least 10 times greater bandwith, that's a 1 Ghz bandwith amplifier...Doe you think it is not a complicated amplifier ?

[oldway]

then you mean voltage gain control that i said before its so expensive

OK, could you please define expensive? 1 USD? 3 USD? 5 USD? 10 USD? 20 USD?

in my country a VGC is about 15 US . in large scale it is expensive 

You intend to produce something in large scale ?...You are kidding...

[tggzzz]

in my country a VGC is about 15 US . in large scale it is expensive 

Why don't you specify your country?

My guess is that you think function generators are unnecessarily expensive, and that you can make cheaper ones. For that to be true one of two preconditions must be valid:

• you have a secret technical innovation that nobody else has thought of. Given your question, I doubt that very much
• you can design, procure, make, test, sell, distribute, and all the other business activities cheaper than other people. Why do you think that other people aren't already doing that?

You should research the "Dunning Krueger effect".

[Fungus]

Here's a circuit I found on the web. I think it will do what you're looking for. All you need is a cheap potentiometer:

[navidrct]

Here's a circuit I found on the web. I think it will do what you're looking for. All you need is a cheap potentiometer:

that was everything i need . thanks . plz don't hurt ur brain to much

[navidrct]

i think i found a solution .
that was interesting that what Agilent do in its function gen .
harder for software but cheaper in hardware

[navidrct]

in my country a VGC is about 15 US . in large scale it is expensive 

Why don't you specify your country?

My guess is that you think function generators are unnecessarily expensive, and that you can make cheaper ones. For that to be true one of two preconditions must be valid:

• you have a secret technical innovation that nobody else has thought of. Given your question, I doubt that very much
• you can design, procure, make, test, sell, distribute, and all the other business activities cheaper than other people. Why do you think that other people aren't already doing that?

You should research the "Dunning Krueger effect".

thanks
but i did it in 100 MHz output in cheap way with right choose .
Agilent in function gen of old time has a method that is so cheap that i want to use
variable part of circuit was issue for being cheap
i will use it and i will show the result

[tron9000]

Here's a circuit I found on the web. I think it will do what you're looking for. All you need is a cheap potentiometer:

that was everything i need . thanks . plz don't hurt ur brain to much

WHAT? A bloody POT! Here's me getting all ...and all he needed was a flipping POT!

Worse than the ending to Revolver!

[AF6LJ]

Here's a circuit I found on the web. I think it will do what you're looking for. All you need is a cheap potentiometer:

that was everything i need . thanks . plz don't hurt ur brain to much

WHAT? A bloody POT! Here's me getting all ...and all he needed was a flipping POT!

Worse than the ending to Revolver!

That wouldn't work very well anyway.
Apparently the output flatness over frequency is not important to the designer of this FG.
There is no "cheap way" to have uniform output amplitude over a wide frequency range at those frequencies without an auto-leveling circuit.

[Fungus]

Here's a circuit I found on the web. I think it will do what you're looking for. All you need is a cheap potentiometer:

that was everything i need . thanks . plz don't hurt ur brain to much

No problem! 

[navidrct]

Here's a circuit I found on the web. I think it will do what you're looking for. All you need is a cheap potentiometer:

that was everything i need . thanks . plz don't hurt ur brain to much

WHAT? A bloody POT! Here's me getting all ...and all he needed was a flipping POT!

Worse than the ending to Revolver!

U killing me

[SaabFAN]

My solution:

J-FET Attenuator controlled by a OpAmp that is fed with the voltage from a Peak Detector and one from a DAC. After that a simple AB-Class amplifier powered by +/-15V with the Peak-Detector connected to its output.

[AF6LJ]

My solution:

J-FET Attenuator controlled by a OpAmp that is fed with the voltage from a Peak Detector and one from a DAC. After that a simple AB-Class amplifier powered by +/-15V with the Peak-Detector connected to its output.

I would do simething similar but without the DAC.

[JoeB83]

navidrct: Next time you ask for help please provide a schematic and try being a little less rude. This kind of shit won't fly in the real world.

[navidrct]

navidrct: Next time you ask for help please provide a schematic and try being a little less rude. This kind of shit won't fly in the real world.

I had a simple question not a rocket science
Sorry but most of people here just mask fun of every word without any help.
If somebody think that I'm giving information less than usual can ignore topic.
Please if u don't get the topic just ignore please



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[tggzzz]

navidrct: Next time you ask for help please provide a schematic and try being a little less rude. This kind of shit won't fly in the real world.

I had a simple question not a rocket science
Sorry but most of people here just mask fun of every word without any help.
If somebody think that I'm giving information less than usual can ignore topic.
Please if u don't get the topic just ignore please

Even simple questions need to be approached and asked in appropriate ways.

And we do "get the topic", but you don't!

[AF6LJ]

navidrct: Next time you ask for help please provide a schematic and try being a little less rude. This kind of shit won't fly in the real world.

I had a simple question not a rocket science
Sorry but most of people here just mask fun of every word without any help.
If somebody think that I'm giving information less than usual can ignore topic.
Please if u don't get the topic just ignore please


Sent from my HUAWEI G730-U00 using Tapatalk

We get the topic; the problem is lack of information.
No we don't need a schematic, but more information would be helpful.

Is this function generator operating from DC-100MHZ?

designing an output leveling circuit is not such an easy task, how are you going to compensate for frequency change?
how about compensating for wave shape?
Are you going to be driving a 50 ohm load?

We really cannot be very helpful without more information.

[navidrct]

navidrct: Next time you ask for help please provide a schematic and try being a little less rude. This kind of shit won't fly in the real world.

I had a simple question not a rocket science
Sorry but most of people here just mask fun of every word without any help.
If somebody think that I'm giving information less than usual can ignore topic.
Please if u don't get the topic just ignore please


Sent from my HUAWEI G730-U00 using Tapatalk

We get the topic; the problem is lack of information.
No we don't need a schematic, but more information would be helpful.

Is this function generator operating from DC-100MHZ?

designing an output leveling circuit is not such an easy task, how are you going to compensate for frequency change?
how about compensating for wave shape?
Are you going to be driving a 50 ohm load?

We really cannot be very helpful without more information.

Thanks
I'm gonna use agilent way for that .
Hope it work


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[KJDS]

navidrct: Next time you ask for help please provide a schematic and try being a little less rude. This kind of shit won't fly in the real world.

I had a simple question not a rocket science
Sorry but most of people here just mask fun of every word without any help.
If somebody think that I'm giving information less than usual can ignore topic.
Please if u don't get the topic just ignore please


Sent from my HUAWEI G730-U00 using Tapatalk

We get the topic; the problem is lack of information.
No we don't need a schematic, but more information would be helpful.

Is this function generator operating from DC-100MHZ?

designing an output leveling circuit is not such an easy task, how are you going to compensate for frequency change?
how about compensating for wave shape?
Are you going to be driving a 50 ohm load?

We really cannot be very helpful without more information.

Thanks
I'm gonna use agilent way for that .
Hope it work


Sent from my HUAWEI G730-U00 using Tapatalk

Have you worked out yet why we need more information in order to provide a good answer?

Which agilent schematic are you using? It's probable that it could be simplified for your purpose, it's also very likely that there will be some subtleties in any design that will provide flat variable gain from DC to 100MHz that aren't obvious.

[DimitriP]

You be not now a lot I found myself annoy

Jesus christ!!