Hawes Mechanical Television Archive by James T. Hawes, AA9DT
Transistor Preamplifier Calculator
  • Transistor type: Use type 2N2222, 2N3904, 2N4401 or equivalent. (hFE = 200.)
  • With some transistors, you might need to adjust Rb1 or Rb2 value for correct bias.
  • See footer for important disclaimer.
Enter power voltage:

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

Schematic drawing of amplifier this calculator designs
Click image for symbol key

•Disclaimer: Use this calculator script (program) at your own risk. The author assumes no responsibility for your success or failure in using methods presented here. The author neither warrants nor guarantees accuracy or effectiveness of his programs, circuits or methods. The author makes no guarantee that the program presented here is suitable for any purpose. You may only use the program for personal applications. If you desire to use the program for profit, contact the author for a license.

•Created by the author HTML, Notepad, JavaScript & ASP.NET. •URL: http://www.hawestv.com/amplifiers/trans2.htm
•Webmaster: James T. Hawes •Revised -- April, 2005