This is a homebrew IC keyer using a 7400, a 7473 and two 555s. Here's a
schematic similar to the one used for this project.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDFxScro83-sEFr2gjqlUTnDhA_jcNOyCNxY8fHd50ukdayB0PuI9S-dQnnx8mUnq08BkjQCEYPWramlbMbB1R7dFAuhUP9_01ThX3P1iYprSZnxcoIHdXDdK6uv_Z9Ms3YIGWHX3wMYM/s200/DSC01308%255B1%255D.JPG) |
Simple CW Keyer |
The difference is that I used two 555s instead of one 7413 for the clock and tone generator functions.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpx9PxX8V2X_JapwR-86iAjAkum7dPaMl5G-RlY4bjqxe6a3H-HQDU_BQqFDwvJ98_EDlnCnaH-BcTTtjokloSm6HOkHIkOaKoayUD80be30w39u0Yt1n4u8C8A2i7baYPnIkpW2rafRk/s200/DSC01358.JPG) |
Simple CW Keyer - inside view |
The paddle is made of spring strip, silver contacts, nuts, screws and bakelite pieces. The enclosure is also homebrewed.
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