Hawes Mechanical Television Archive by James T. Hawes, AA9DT
Transistor Preamplifier Calculator

Note: Calculator requires Java Virtual Machine (Free download at sidebar)

Now with industry standard resistor & capacitor values! Have a 56K or slower modem? Please allow 1 minute for calculator to load. See footer for important disclaimer. Also note: With some transistors, you might need to adjust the values of Rb1 or Rb2 slightly for correct bias. Transistor type: I suggest type 2N2222, 2N3904 or 2N4401 (or equivalent) devices. (Device hFE = 200.)

Schematic: One-transistor 

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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 program on this page is suitable for any purpose. Proceed at your own risk. You may only use the program for personal applications. If you desire to use the program for profit, contact me for a license. — The Webmaster

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

•URL: http://www.hawestv.com/amplifiers/trans1.htmWebmaster: James T. Hawes
•Revision—September, 2010 •Software tools: HTML, Notepad & HTML, Notepad, Java 2 (Sun SDK 1.3) & Explorer.