This circuit from an old Argentine publication from the 1970s uses a power transistor to obtain an output of approximately 4 watts in a common speaker from 500 mW to 1 W of radio output, or other small radio equipment. with. We can use a TIP32 with a heatsink and eventually changing R2 to get the best performance with R3 setting. Transformers can be obtained from old equipment using these components.
