SevenFortyFun, a transistor level op amp kit. [ OPEN ANALOG ]
Most importantly go read about the inventor of the 741 - David Fullagar - at the links below:
- http://electronicdesign.com/analog/david-fullagar
- http://www.edn.com/electronics-news/4326905/Voices-Dave-Fullagar-analog-IC-designer-and-entrepreneur
What's in this repo?
- Gerbers of SevenFortyFun Rev 1.0 UPDATED FILES SEE: https://github.com/acrobotic/OA_SevenFortyFun/tree/master/pcb-main
- Schematic (SevenFortyFun schematic.png)
- LTSpice Simulation (SevenFortyFun Simulation.asc)
- Tutorial/Guide of the SevenFortyFun, an explanantion of each transistors function (SevenFortyFun.pdf)
To run LTSpice simulation download LTSpice (http://www.linear.com/designtools/software/) and then:
- View SevenFortyFun Simulation.asc
- Click RAW
- Copy to notepad (or your favorite text editor)
- Save as .asc making sure 'save as type:' is selected to 'All Files'
- Make sure encoding is ANSI
- Open with LTSpice
or just download the whole thing as a zip...
INSTRUCTIONS FOR INSTALLING COMPONENTS:
_______________________________________
TRANSISTOR FOOTPRINT
- Install as silkscreen shape suggests be careful with pnp/npn type
PINOUT OF HEADERS
- 1:offset null
- 2:Inverting Input
- 3:Non-inverting Input
- 4:V-
- 5:offset null
- 6:Output
- 7:V+
- 8:NC
TODO
- Make datasheet & characterize SevenFortyFun (i.e. slew rate, GBW, etc...)
- Unify diagrams in the PDF/Make them look pretty
- Edit out "ideal diode" comment in PDF with the more factual reality of a diode connected transistor - to obtain a very low leakage diode. For example, a 3904 type transistor will have <1pA of reverse leakage using the Base Emitter
junction.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
