2n2222 audio (again!)

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From: Fran Flynn (fflynn@together.net)
Date: Sun Dec 07 1997 - 00:42:10 EST


OOPS! I FORGOT SOMETHING!

The coupling capacitor to the speaker can be any value between
47 and 1000 uf, at 16 or more volts. 100 uf works fine.

   ________________________________________________________ +12volts
    | | | | | |
    | | | | \ |
    \ \ \ \ 22k / |
 22k/ /4.7k /4.7k/22k + \ / c
    \ \ \ \ q3b-||---|----| Q3
    | |--(q4b) | |--(q3b) 10uf \ \ e
    | | q1 | q2 | 2.2k/ |
    | / c c \ | \ \
-||-- | |------- | / 10 ohm 100uf/16v
| | \ e e / | | |------|
| | --------- | + | 10uf 22k\ |----------||--|----O output
| \ | \ _ + / / Q4 |---|
| / 10k \ /10k _ q4b-||-|----| .001 | \
| \ / 1k \ | 10uf | \ e - / 100k
| | \ | | 2.2k/ / 10 ohm - |
| | | | | \ \ |----------> to
| |_______|________|____|_____________|______|______________________input_
| |
|_______> to 100k resistor at output _
                                                      - (gnd)

fflynnattogetherdotnet
(email address rearranged to foil spambots)
Francis Flynn
Ham Radio callsign:KM1Z


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