Aideepen | VU Meter Driver Board Positive Negative Power Supply Professional-Grade VU Meter Head Level Meter Driver for Power Amplifiers

Features:1. Dual-channel unbalanced input with high-impedance buffering, exerting minimal influence on the pre-amplifier.2. Full-wave rectification without compression, with a dynamic range of up to 60dB, accurately restoring the level.3. Equipped with acceleration and damping control circuits, it boasts exceptional ability to capture minute signals, ensuring slow and gentle swingback.4. Equipped with a built-in power-on/off protection circuit, it completely eliminates the phenomenon of pointer overshoot.5. Strong driving capability, suitable for driving medium-sized meters, with strong universality.Product IntroductionThis driver board is specifically designed for recording studios and professional audio equipment, supporting dual-channel unbalanced input. Based on the original circuit principle, we have optimized the wiring and added a high-impedance buffer circuit at the input end, significantly increasing the input impedance with minimal impact on the front-end system. The performance of the imitation product is satisfactory.The core circuit adopts full-wave precision rectification without compression processing, truly reproducing the dynamic changes in voltage levels. The board is equipped with a primary amplification stage, offering a wide range of applications and high sensitivity. With an input dynamic range of up to 60dB, it can even be used as a power meter driver for 100W/8Ω power amplifiers after adjusting the parameters.The pointer acceleration and dynamic damping control are the standout features of this board: it starts quickly and sharply, with an exceptional ability to capture minute signals; the return swing is slow and gentle, and the pointer moves with lightness and fluidity. It completely eliminates the drawbacks of ordinary drive circuits, such as sluggishness and pointer lag in response to pulse signals. It is not only suitable for driving medium-sized meters (making minute signal indications clear), but also for driving small meters like the 39 series - these small meters have small swing amplitudes and require higher control accuracy, yet this board still achieves clean and crisp movements.Addressing the issue of impact signals easily generated during the startup and shutdown of field-effect transistor (FET) chips, the on-board startup delay connection and shutdown instantaneous disconnection protection circuit (utilizing a 12V relay) has essentially eliminated the pointer overshoot phenomenon during startup and shutdown, resulting in a higher degree of product completion.Power supply requirements: ±12V DC (not to exceed ±15V). Suitable for recording studios, mixing consoles, power amplifier level monitoring, and VU meter modification projects.Product Parameters:Power supply: ± DC 12V-15V (recommended range is ±12V, with a maximum of ±15V)PCB size: 11.587.3 cmFixed hole size: 10.66.3cm[Instructions for Use]: The power supply requirement is ±12VDC. A single 12V power supply cannot function properly. The power supply board should be composed of 7812, 7912, or a ± power supply board composed of LM317, LM337.The meter head must be a pure ammeter and voltmeter, with an internal resistance of 650 ohms and a sensitivity of 0.5 mA. The type of voltmeter that requires no drive and has an internal rectifier circuit cannot be used.Attention! This driver board design is intended for driving a standard professional VU meter head with an internal resistance of 650 ohms and a sensitivity of 500 UA. It may not be suitable for VU meter heads of other specifications and may require further adjustments to function properly.Product list:Vu Meter Head Level Meter drive module*1