Please see linked circuit done in Multisim.
The simulation shows a 10V neg DC offset but with no 100Hz signal.
I must have misunderstood you.
What is need to make the circuit shown work?
Any suggestions?
Claus Jensen
check the power rail connections to the opamp
NT
For 10V with a ground reference, yes. ;-) There are many ways to skin the cat.
Please see yourself to the nearest door, lifeless idiotic troll.
You asked for a -10 at zero in for the output, that is what I gave you.
The (-) input as I showed takes care of the offset and gain needed.
THat gives you a 10VPP with one side at -15 and ther other at -5 on the output.
Have you failed to again on showing what you are trying to do ?
Jamie
Oh come on, give him some attention. :)
joe
Really?
Please scroll back and look at details, you need a rail to rail with the spec's offered.
It's times like this you need a lawyer to have the client sign a contract to their specifics so that later thay can't say, " That isn't what I wanted".
Jamie
No I just tried to simplify the design in the hope someone might advise me why this particular one does not work.
I thought it used one of the same principles suggested here.
BTW, your prior circuit did not work either. But I haven't given up.
Claus Jensen
What kind of a person has nothing better to do than drop in just to make comments like this?
Make the world a better kinder place, and start with yourself.
Claus Jesnen
Being coy does not garner advice.
What Philbrook showed should be working. The question is, "What are YOU doing wrong?" ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Fred is one of our resident assholes. However, you are approaching such acclaim by being vague about what you want the circuit do.
Implying you're just trying to "simplify" the problem for us will get you tossed down to S.E.B... the combined skill set available here probably totals THOUSANDS of years. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Oooops! My bad! Philbrook's circuit doesn't work as you desire :-[ ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Like this...
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Ok, you seem to lack the proper lingo to get your needs across..
So. let me ask you to lay out the needs different, since what you asked for does work as I showed, but you seem not to know what you want?
Please answer these questions..
if your input signal never goes below 0 volts, please specify! You did say it was a bipolar? That indicates a +/- signal.
Have a good day..
Jamie
I remember him writing somewhere in this thread (I'm not going to look it up and maybe I might be wrong on this) that it is a rectified sine wave, i.e. positive only.
joe
Sorry Joe, you are thinking of another thread: "DC Offset Output of Emitter Follower" by Mike Towner.
piglet
That's not Jamie's circuit.
R2 100k ___ .----|___|---. | | | +5V | R4 | --- | 25k | | | Voff ___ | |\| | +2.5V--|___|--+--|-\ | | >+-----+--> -5 to -15/10VPP Vin >-----------------|+/ |/| | --- -15V
You used a 100K potentiometer instead of Voff=+2.5V, that's your problem. You need a voltage source, or to re-scale the resistors.
Replacing R4 with a divider works.
+5V -+- | .-. 50K| | R2 '-' 100k | ___ +---------+----|___|---. | | | .-. | +5V | | | | --- | 50K'-' | | | | | |\| | === '--|-\ | | >+-----+--> -5 to -15/10VPP Vin >-----------------|+/ |/| | --- -15VCheers, James Arthur
Yep. Actually make the two 50K's a 100K pot and the gain error isn't too bad for decent DC adjustments. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
If the high side's tied to +5v and the 100k pot is centered, the voltage offset will be off by a factor of two, and the signal gain will be three instead of five.
If the high side's tied to +12v, as in Claus' simulation, yes, that's
24K equivalent, pretty close.Cheers, James Arthur
A 100K pot, set at 50%, tied to +5V and GND is a Thevenin equivalent... +2.5V, 25K, is it not? ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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