TR1 and TR2 transistors funcitons as a direct link voltage amplifier. R6 resistor, D1 and D2 diodes determine standby current complement driver stage (Tr3/Tr4) and output stage (Tr5/Tr6). C3, C5, C6 and R3 will help to maintain stability. The amplifier is the input sensitivity is 400 ma at 4 ohm load and 12V supply and [...]
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.
Original source:
An old HAM handbook I found in the school library many years ago.
The schematic for the chipamp is shown below in Figure 01 and consists of just three resistors. This is very similar to the many gainclone amplifiers that have been constructed by DIYers. The layout follows my veroboard point-to-point LM3875 gainclone chip amp and goes one step further by eliminating the tiny veroboard. Now the chassis [...]
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