Although it has many advantages, unlike the self-excited system, the ultrasonic circuit control board system has its own closed-loop circuit. The input end always tracks the output end signal. It needs another sampling system to form a closed-loop tracking system. The control circuit of the exciting ultrasonic circuit control board controls the output frequency of the oscillator by searching the value of the output current to complete the purpose of frequency tracking.
| Model | Power（W） | Frequency (khz) | Operating voltage | Maximum output current |
| PU-XLB50W | 50 | 25khz,28khz,33khz,40khz | AC110V/220V | 0.33A |
| PU-XLB100W | 100 | 25khz,28khz,33khz,40khz | AC110V/220V | 0.45A |
| PU-XLB150W | 150 | 25khz,28khz,33khz,40khz | AC110V/220V | 0.65A |
