Recent content by djstar

I do apologise for the lack of detail, some one needed to use the test equipment urgently so that's all the data I could pick up. The output from the sig gen is a sine wave with a amplitude of 1 PK-Pk the peak is at about 15KHz at about - 8dB ( input 1V output 350mV) r3 = 27K and r2 = 1K

Thanks for all the message guys, just to clear things up I have attached a picture of the 3 opamps I have connected together, what I want to know is why the output is behaving like it is in the graph. Claire

looking back at the results i realized that the results were for a 3 op amp instrumentation amplifier that i was messing with rather than the single diff opamp. the inputs of the IA are shorted with a wire and the function generator is connected directly to the inputs you mention about a...

I am having a play about with the differential amplifier using a LM324 and have shorted both inputs and set them to 3V sine wave at 100Hz. i understand that in a ideal op-amp the output should be 0, how ever i am unsure of what is happening at the output... i increase the frequency every 1Khz...

for a) do i rearrange the formula and divide 30n/25kg = 1.2 m/s ? for b) I now understand that the forces acting down must equal the forces acting up. does gravity come into this scenario?

Homework Statement Hi could some one point me in the right direction for both parts of these questions, I am electrical biased so this is all new to me. A model boat off mass 25 Kg is crossing a still lake at a constant speed, in a straight line. The engine is propelling the boat along...

Thanks, Once you're broke down the equations its made it easier to see what is going on. Thanks for the help :)

Thanks for the reply but that still doesn't tell me how to calculate the -22 dB.

Hi, I'm investigating what happens to bandwidth at resonance of a series RLC circuit when each component is doubled. i have simulated the circuits and created a bode plot. You can see from the photos that at resonance the gain peaks at -20.82 dB. I would like to know how to calculate this...

Hi, I have been using a tensiometer to help me try and determine what the material is. one of the materials has been heat treated and and instead of a nice necking formation in the middle of the "dumbell sample" it has fractured perpendicular to the sample right next to the chucks of the...

Hi Ratch, Thanks for the quick reply. Its all starting to make sense now. i understand the maximum power is a lot less because the current and voltage is out of phase. However the only thing I'm still unclear on is that the maximum power is transferred when the source resistor is 1k ohm and...

Hi, I'm investigating maximum power transfer in a AC circuit. I understand that for maximum power transfer the reactance both cancel each other out and the value of the source resistance and load resistance have to be equal. I have also found some formulas to prove this. what i would like...

hi hallsofivy thank you for the very prompt reply. sorry about the title, that was a typo. ive manged to work out before the collision as 90 MJ and after as 56.2 5MJ so the answer is 33.75 MJ?

Homework Statement A train of mass 50 onnes traveling at 6o m/s collides head on into a stationary train which has a mass of 30 tonnes. If the two vehicles lock together after impact, calculate using the principles of conservation of momentum, what will be a) their velocity after impact? b)...