Pierce type crystal oscillator circuit

  
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The Tuna Tin 2 was originally designed by Doug DeMaw, W1FB in 1976. It appeared in QST, and was subsequently built by hundreds of QRPers, who were attracted to the project by the relatively easy parts availability. In fact, at the time of publication of the article, you could stop by the local Radio Shack and pick up everything needed except for t
Pierce type crystal oscillator circuit - schematic

he crystal. When I looked at the article in the summer of 1996 and decided to build another Tuna Tin 2, I discovered that all of the parts were not available from Radio Shack. I contacted Dave Meacham, W6EMD, and he agreed to look at the article and update the parts to modern, available parts sources. Because we were changing the physical size of some of the parts, it meant that a new board would have to be layed out. That was to be my contribution to the project. The board was layed out and the new schematic drawn with Circad which is available free on the internet at. The free version is demo version that is not crippled and is very useful for the average ham. You have the ability to printout circuit board patterns to a laser or inkjet printer with the demo version. About the only way the demo version differs from the full version is in the ability to generate Gerber files and PCX output. Holophase even has a special price for hams, $295 vs. $995 for non-hams. Contact them for details. A look at the schematic will indicate that there ’s nobody at home, so to speak, in the two-stage circuit. A Pierce type of crystal oscillator is used at Q1. Its output tickles the base of Q2 (lightly) with a few milliwatts of drive power, causing Q2 to develop approximately 450 milliwatts of dc input power as it is driven into the Class C mode. Power output was measured as 350 milliwatts (1/3 W), indicating an amplifier efficiency of 70...



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