Recent content by ski

This is a VERY elementary question, but I'll ask anyway to make sure: If you have voltages VDC and VAC (a sine wave offset by a DC voltage), how can you get rid of the DC offset to make the sine wave (AC) centered about zero?

I changed the LM324 to a uA741 on the preamp (first opamp) to reduce the THD in the preamp. Should I try a uA741 for the second opamp?

It's a standard 8 Ohm speaker... I added a coupling capacitor in line with the speaker so no DC current would go through it. Anyone want to take a stab?

Greetings! I posted a few weeks ago about the preamp for the tape head I'm working on. I solved for all of my resistors and capacitor to get the right frequency response, and below is the theoretical frequency response, followed by what I actually get...

All right, here's what I've got: Flo (low frequency of 50 Hz) = 1/(2pi*tau) I repeated for Fhi (2000 Hz). I solved for tau, which is some combination of C, R1, R2, and R3. Now that I have two time constants, how do I determine what the combination of C and R's to solve for? Thanks...

http://www.littleboyinc.com/uploader/uploads/opamp.JPG I searched all over to get some notes on how to handle opamp circuits like this with feedback, but nothing on when there's no resistor in series with the input source. Can anyone help me out on where to find examples? This sort of...

Here was what's suggested I do: 1.We'd expect an average of 50+- 1.98*2/sqrt(50) The standard deviation by definition is 2/sqrt(50) 2. Not as sure about this one but following the logic of the last one.. sqrt(10)*12=s and then stdv= s/sqrt(40) and s/sqrt(160) where the mean =...

1. If a school offers 3200 separate courses and a survey of these courses determines that the class size is 50 with a standard deviation of 2, what would one expect for the average and standard deviation of a subset of 50 of these classes selected randomly? 2. In a survey to estimate the...