Hardrock-50 Builder's Portals

FOR ALL Amplifiers - New bias current setting.

All amplifiers should be set for 150 mA per MOSFET. When setting the bias use 150-300-450-600 mA.

The assembly information for the Hardrock-50 depends on your serial number. If your amp have lost its serial number label you can also tell which instructions to use by the revision letter on the amplifier PCB.

For information on amplifiers with rev C amplifier PCBs and Serial Numbers below 1100. Contact HobbyPCB technical support. (I just needed more space on the website)

Serial Number 3134 and UP: We are currently shipping rev H boards.

Serial Number 1400-3133

Serial Number 1200-1399

Serial Numbers 1100-1199

QSK Board

Instructions for the QSK mezzanine board that plugs directly into the amp board are found in the Assembly Manual. Instructions for the older OSK board that mounts to the bottom cover are at the bottom of this page.

Rev H Rear Panel

We have updated the rear panel board to use a FTDI chip that should be plug-n-play with most operation systems eliminating the need to install drivers. The new USB port is optically isolated from the rest of the amp to prevent ground loops. Should you ever need the schematic, you can get it here.