parts

Transformers, Audio Radios also contain audio transformers. They contain two coils of wire wound around a metal core. Transformers help move the audio from one stage to the next, and couple the final audio stage […]

RF/IF Coils and Chokes Examples of fixed and variable inductors. Radio Frequency coils (RF coils) are also called inductors. They are typically measured in fractions of a Henry. They can be variable values or fixed […]

Capacitors Parts of a capacitor. As shown here, a capacitor consists of two or more parallel conductive (metal) plates which are not connected or touching each other, but are electrically separated either by air or […]

Diodes A typical diode and its schematic symbol. Diodes are solid-state devices, a little like transistors, but with only two leads. In transistor sets they are often employed to convert RF or IF to audio […]

Switches In addition to the power switch often found as part of the volume, control, portable radios can have additional band switches, tone control switches, RF sensitivity controls, dial light push buttons and more. Inside […]

Unsung Heros write What Do You Think? Do you have tips and experiences to share? Questions? Suggested corrections or additions?  Leave a comment below. I’ll review comments and post or incorporate the most useful ones. […]

Gatering Signals A radio’s antenna is exposed to radio frequency signals (RF) bombarding all of us and everything from the sky. Signals include radio programs, TV stations, cell phones and endless spurious interfering signals from […]

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Thermistors A Thermistor and its symbol. Thermistors are small components that dramatically change resistance as their temperature changes. Transistors and other components change value as they warm up and cool down. These resistors attempt to […]

Resistors, Variable Volume controls, also called potentiometers are variable resistors that come in a variety of sizes, but usually do the same thing—control the amount of audio circuitry amplification. Wiper (Blue) Resistive coating (Blue) . […]