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This audio amplifier is described in "A High-Performance Receiver for 160 Meters", Solid State Design for the Radio Amateur, by Wes Hayward and Doug DeMaw, Page 138. This audio amplifier is rated at 3.5 watts and uses a pair of hefty transistors in a push-pull output. I use this amplifier in the receiver. The high performance ability of this amplifier is described on page 138: "There has been no aural evidence of distortion at any signal level while using the circuit of Fig. 40". This includes very weak DX signals for which this audio amplifier really does its best. The LM301 can be ordered from BG Micro at 29 cents each. This part may be difficult to find. They also carry a complimentary pair of output transistors that are used in the output stage of car audio amps - 2N6488/2N6491. Their part number is TRN2N6488/TRN2N6491. Cost is $1.25 a piece. From my experience, this is the best audio amplifier that I have ever built. It is not picky about the type of output transistors. Any PNP-NPN pair in a TO-3, TO-220, TO-040 or TO-043 package advertised for audio circuits work very well. Use landscape setting on your printer when printing this diagram. Right click on the diagram and select View Image, then when it opens in a new browser window, click on Print Settings, select Landscape layout in the appropriate folder, select Fit to Page, and then click on Print. |
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