The AL500 started after the need for a good autolevel audio processor for livestream or broadcast productions.
The analog circuit is designed with premium grade electronic opamps. Several options are available if you want to exchange opamps, and if desired the input opamp can be exchanged by an input transformer. The differential output stage is based on a DRV134 driver originaly made by Burr Brown. It can be replaced by THAT1646 with improved performance.
The PGA2311 device is a high-performance, stereo audio volume control designed for professional and high-end consumer audio systems. The PGA2311 uses an internal high-performance operational amplifier to yield low noise and distortion.
The theoretical specifications are :
- maximum input level : +20dBu
- maximum output level : +20 dBu (limited by rack power supply)
- variable attenuation or gain : -95.5dB … +31.5dB (127 dB range)
- firmware upgradable via mini USB (Arduino Nano V3)
Feel free to ask any questions or features you would like to see on this item. The behaviour and features can change in the future as the leveling process can be updated by firmware.
DIY kits (all electronic components + printed circuit boards + alu front panel) are available for purchase.
Part List – Display PCB
|D102, D103, D104, D105||DC10EGWA||Kingbright|
|R101, R102||47K0 SMD 1206||optional|
|C101, C102, C106, C107, C108||100nF X7R SMD 1206|
|C103, C103, C104, C109||47uF 10V X7R SMD 1206|