HG 2SC2879 Transistors in 11 Meter CB Radio Amplifiers: The Role of Biasing and the Influence of YouTube Builders
The CB (Citizen Band) radio community is a vibrant blend of hobbyists, experts, and educators. Central to their operations are amplifiers, especially those using the HG 2SC2879 transistors. When it comes to amplification classes, particularly Class AB and Class C, the biasing of these transistors is pivotal. Additionally, the knowledge-sharing by popular CB linear amplifier builders on platforms like YouTube plays a significant role in educating and inspiring the community.
Overview of HG 2SC2879:
The HG 2SC2879, a successor to the original Toshiba variant, is a silicon NPN epitaxial planar type transistor. It’s particularly renowned for its power output capability, efficiency, and reliability. When Toshiba stopped its production, HG stepped in, ensuring the transistor’s continued role in the CB radio world. Here’s the datasheet for the HG 2SC2879C
Amplification Classes and Biasing:
- Class AB Amplification:
- Definition: Class AB is an intermediary between Class A and B. Here, each transistor conducts electrical current for more than half but not the entirety of the signal cycle.
- Biasing: In Class AB amplifiers using HG 2SC2879 or HG 2SC2879C transistors, the bias is adjusted so that the transistor remains active for more than 180° but less than 360° of the input cycle. This reduces distortion at the crossover point, a common concern in Class B amplifiers.
- Advantages: This class strikes a balance between efficiency and linearity, making it suitable for voice and music transmission.
- Class C Amplification:
- Definition: Class C amplifiers conduct current for less than half of the signal cycle. They are highly efficient but not linear.
- Biasing: For HG 2SC2879 in Class C, the bias ensures the transistor activates only when input voltage surpasses a set threshold.
- Advantages: Primarily used for RF where high efficiency is sought after, sacrificing linearity.
YouTube’s CB Linear Amplifier Builders:
YouTube has become a treasure trove of knowledge for CB radio enthusiasts, thanks to skilled builders who share their expertise:
- @BoxBuilderIdaho: Mr BBI Known for detailed walkthroughs, @BoxBuilderIdaho offers insights into amplifier construction, using components like the HG 2SC2879. The channel often dives deep into the intricacies of amplifier building, making it a haven for both newcomers and veterans.
- @1883GotDown: GatekeeperAmps With a knack for showcasing power-packed amplifiers, @1883GotDown gives viewers a front-row seat to the magic of CB amplification. Through their engaging content, the channel demystifies complex topics, making them accessible to all.
- @307amplifier8: Jim Mcknabb Emphasizing both theory and hands-on demonstrations, @307amplifier8 bridges the gap between knowledge and application. For those seeking both the why and how of CB radio amplifiers, this channel is a go-to resource.
- @tin-man-amps: Tinman Amps is a well-respected member of the CB linear amplifier community. He has made a significant contribution to the community through his amplifier designs, repairs, and modifications.
- Tinman Amps is known for his high-quality, durable amplifiers. He uses only the best components in his designs, and he takes great care in building each amplifier. His amplifiers are also very efficient, which means that they produce more power with less input power.
- In addition to building new amplifiers, Tinman Amps also repairs and modifies existing amplifiers. He is a skilled technician with a deep understanding of amplifier design and operation. He can repair or modify almost any CB linear amplifier. Tinman Amps website is: tinmanamps.com
Conclusion:
The HG 2SC2879 transistors play a foundational role in the world of 11-meter CB radio amplifiers, especially when it comes to Class AB and Class C amplification. But beyond components, it’s the community and educators, like those on YouTube, who elevate the craft. Channels like @BoxBuilderIdaho, @1883GotDown, @tin-man-amps and @307amplifier8 not only further the art of amplifier building but also foster a shared passion and knowledge base for all enthusiasts.
