Page 50 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits
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FIGURE 3-16 Polarized electrolytic capacitors.
Audio transformers will be used in reflex, regenerative, and superheterodyne radios
(Figure 3-17). These audio transformers will be used for extracting audio signals
from an amplifier and providing signals suitable to drive earphones or speakers.
They will have primary and secondary windings (e.g., at least four leads). Audio
transformers normally are available in two types, input or driver transformers and
output transformers. In newer audio amplifier designs, audio transformers are not
used and are replaced by integrated circuits or discrete transistors.
