Dual-frequency oscillation circuit diagram composed of 567

Crystal Oscillator

Probe domestic high frequency needle JKT-50L with 3 probes

Quartz Oscillator 3225 20M OSC

The 567 is an audio decoder commonly used in automated telephone systems to detect incoming call tones. At its core, it features a high-reliability and high-precision phase-locked loop (PLL) circuit. Depending on the configuration and component values used, the two output frequencies are set at 1.5 kHz and 4 kHz respectively. This makes it ideal for applications such as tone detection, signal monitoring, and voice recognition systems. The device is known for its stability and accuracy, ensuring reliable performance even in noisy environments. Whether you're working on telecommunications infrastructure or developing custom audio solutions, the 567 offers a versatile and efficient way to handle tone decoding tasks.