A simple two-stage amplifier. Use any general-purpose NPN with high gain. It will drive low impedance headphones directly. A speaker will probably require further boost.
An old HAM handbook I found in the school library many years ago.
Original source:http://www.geocities.com/tomzi.geo/index.htm
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This entry was posted on Monday, January 21st, 2008 at 10:11 pm and is filed under Audio - Alarm, Power Amplifier.
