7400 competition entry: Capacitance meter

Posted on Friday, October 21st, 2011 in 7400 contest by DP

Alvaro built a Capacitance meter out of logic chips for the Open 7400 Logic Competition. His project measures capacitance of a capacitor and displays it on a 7-segment display.

It works by using the said capacitor in a RC oscillator, which changes its output frequency proportionally to the capacitance in it’s RC circuit. The frequency is then measured by comparison to a known stable clock. The video above shows it in action.

Via the contact form.

This entry was posted on Friday, October 21st, 2011 at 1:00 pm and is filed under 7400 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.

2 Responses to “7400 competition entry: Capacitance meter”

  1. Khien Wabingga says:

    hi :) can you give me the list of components you used in making the capacitance meter? this design would be my project on my subject, so please tell me the components and values. thanks!

    • Alvie says:

      Sure, care to send me an email ? Note that some of those components (mainly caps) had to be adjusted slightly due to inaccuracies in voltages and transistors.

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