This was a project that I had in another one of my favorite courses, Electronics II.
The circuit diagram for the differential amplifier (click for a bigger picture)
We were supposed to make a differential amplifier from discrete components only. It was supposed to meet strict requirements such as:
- Ri = 100k +/- 10%
- Ro = 100 +/- 10%
- Operational on 9V DC
- OC output 6 Vpp and uncut sine wave at that input signal to an 100 ohm load
- Au differential = 200
- CMRR = 46 dB
- …
Great post, I bet a lot of work and research went into this article.