Just looking into some full wave rectification without diodes and I have so far found 2 ways. One with 2 op amps, quite costly, or one promising one with just a transistor:
I do like the look of this, might be right up my street. It does look slightly jubious, but its worth a [...]
Long story short, I’ve finished my Masters (and got a 1st, yay!) a while ago now for which the EFPD was my final year project. It was this that boosted me to a first. 94% to be exact (in my project). I then went away working for 3 months and then went to [...]
Had the presentation today, went well.
More thoughts about the new circuit. Been looking at the low power side this afternoon, found a small CR2032 is a great sized battery at 20mm diameter and it does quite well at 220mAh. [1298246 FEC]
But I dont think that would be very good as a system. As [...]
Ok done the magnet tests to find what affects the system and came to the conclusion that it was both magnetic and electric fields that affect the device. So, im pretty much done, because we cant find a proper equation that works so I will have to just go on experimental data and form my [...]
Data from the IO and Chopper Analysis
New device reults taken x4
Old device results taken x2
New device from 5m, results show that it could go further with more gain.
The old device was from 3.5m was rubbush. The noise problem appeared on the first set of results.
Results from old and new device
Schmitt trigger
Square Wave Generator
Right, he loved the device, and I told him about the problems with the sound card. He said what I can do is to modulate the signal at a frequency that can be interpreted by the sound card.
He says I could use a 4066 chip which chops the signal into little bits at a frequency [...]
Heres some inked ideas that Dr. Paulson helped with.
Here
Just found this ECG circuit. What was of interest was the filter on the inst. amp’s reference.index.php (PNG Image, 841×468 pixels)