Hawes Amplifier Archive by James T. Hawes, AA9DT
Transistor Preamplifier Calculator

  • Transistor type: Use type 2N2222, 2N3904, 2N4401 or equivalent. (hFE = 200.)
  • Resistors. With some transistors, you might need to adjust Rb1 or Rb2 value for correct bias.
  • Disclaimer. See footer for important disclaimer.

Enter power voltage:

Schematic drawing of amplifier that this calculator 
Click image for symbol key.

Compatible transistor lists (below). For this program, the transistors in the drop-down lists (and many more) are compatible. All devices are silicon. Germanium devices are incompatible. All FETs are incompatible.

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WARNING. I assume no responsibility for your success or failure in using the tools on this page. I don't warrant the accuracy or effectiveness of these tools, programs, circuits or methods. I make no guarantee that the calculator script (program) on this page is suitable for any purpose. Proceed at your own risk. You may only use the script for personal applications. If you desire to use the script for profit, contact me for a license. — The Webmaster

Page content, art & JavaScript code: Copyright © 2003, 2004, 2005 by James T. Hawes. All rights reserved.

•URL: http://www.hawestv.com/amplifiers/trans2.htm
Webmaster: James T. Hawes •Revision—November, 2010  •Software tools: HTML, Notepad, Explorer, JavaScript & ASP.NET.