Product Description: This circuit is designed to offer stable and reliable operation, drawing on the proven local oscillation technology found in classic black and white televisions. Built for efficiency and convenience, it provides dependable performance without the limitations of batteryonly operation. Key Benefits: Stable Performance: Utilizes the same local oscillation principles as vintage black and white TV circuits, ensuring consistent signal stability. Versatile Power Supply Compatibility: Operates on lowvoltage power sources, including mobile phone universal chargers, voltageregulated power supplies, and similar options, eliminating the need for dedicated batteries. InterferenceResistant Design: Can be touched directly via the antenna or circuit board without impacting functionality. Even if frequency oscillation points are momentarily disrupted, the circuit resumes normal operation as soon as contact is released. Satisfactory Audio Quality: Delivers clear and reliable sound suitable for playback needs. Key Features: Function: Stable signal generation and audio output, resistant to physical interference during handling. Compatibility: Works with common lowvoltage power supplies, expanding usability and ease of setup. Size and Handling: Compact enough to hold in hand, with durable construction to withstand direct handling during operation. Performance: Maintains continuous operation whether stationary or moved, solving issues related to motion sensitivity. Practical Applications: 1. Educational demonstration for electronics students studying oscillation and signal generation circuits. 2. Hobby and DIY projects requiring a reliable audio output circuit with flexible power options. 3. Portable playback or signal transmission setups where stability and ease of powering are critical. This circuit offers a combination of simplicity, reliability, and adaptability, making it a practical solution for both technical experimentation and everyday functional use.