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7400 competition entry: Using two CD4007 IC as an op amp to generate sine waves

Posted on Saturday, November 3rd, 2012 in 7400 contest, contest by DP

Here’s an interesting way of designing analog devices using digital chips. This sine wave generator s based around mosfets contained in the CD4007 IC (a dual complementary pair of mosfets and an inverter).

The CD4007 dual complementary pair and inverter is primarily intended for digital logic circuits. It contains an inverter, and two pair of PMOS and NMOS transistors that can be configured to implement any CMOS logic gates. Since we now have access to pairs of transistors, it should be okay to use these transistors for other purposes than digital, in other words: analog. This idea is not new, in fact this article has already mentioned this possibilty, and now I would like to take the challenge to build something somewhat useful out of it, as simple as possible…

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the contact form.

This entry was posted on Saturday, November 3rd, 2012 at 5:00 am and is filed under 7400 contest, contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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Recent Comments

  • Louis Beaudoin: This is great work guys! Placing an order for a sample pack and hope to use the service to make a custom cable soon.
  • Parkview: Another great idea! Be handy to be able to purchase the corresponding SMD and TH sockets as well.
  • Ryan White: Second that. I'd love the option to extend this already awesome tool to RF cables, hoping it's already in the works because I know the...
  • Tom Keddie: Hi Ian, Congrats on the launch. Suggest you name all the CHRO connectors you have as female. It's not done often but you can insert...
  • Craig Hollabaugh: Excellent post! Thanks