Recent content by tuttyfruitty

Yes your correct, the waveform is the same shape but the peak to peak value changes with change of duty cycle

when i get back to univeristy next monday i will try adding the resistor and capaciotr to the breadboard and see what difference it makes. what is still confusing me is the formula to calculate the output voltage. The theory states Vout = (T/Toff).VS for the results in the table/ the...

Hi, Photo 3 trace 1 is the waveform at the node of the inductor, diode and the FETS drain, trace 2 is the output voltage Photo 1 trace 1 is the current through the inductor measured with a "Pico technology" current probe. Photo 2 is the rining on the rising edge of the pwm

Homework Statement I have recently learned about the boost SMPS and and have built a circuit to investigate the waveforms and levels for Vout, [L] and [C] for different mark space ratios. the circuit consists of a 95uH inducotr, diode, 47uF cap, 70 Ohm load, a FET who's gate is controlled...

Once I get the chance I will connect a scope up to the output. Mike, Just trying to get my head around your answer, from what I have read about negative capacitors, a decrease in voltage across the cap will create a increase in current . As you have worked out the resonant frequency of the...

Ive just done some research on negative impedance, that's some interesting stuff! but how does the negative capacitor effect the circuit?is it sourcing current into the tuned circuit?

The cap in the tank circuit is 10 uF and the feedback cap is 470uF, the oscillation frequency is 2174 Hz, for completeness, the inductor is 470 uH

Hi Dave, Thanks for the reply. The circuit is used at work and the design is a few years old, so I'm unsure why the output is on the input pin. I have found 2 versions of the circuit, one with a variable resistor and one with the capacitor. I understand that the variable resistor is to...

I'm trying to determine the frequency of this oscillator . The traditional resonant frequency equation for the tank circuit doesn't give the correct answer as the feed back capacitor effects the circuit . i would also like to know what the feedback capacitor does? any help would be great.

Hi, i am confused with where to start with. A cyclist is on a bicycle with a mass of 10kg rolls down a hill 150m high. with zero losses what is the velocity of the bike at the bottom of the hill? could some one please send me in the right direction with formulas