SevenFortyFun

SevenFortyFun, a transistor level op amp kit. [ OPEN ANALOG ]

KICKSTARTER CAMPAIGN!

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.