• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Balanced Input Circuit Board

This circuit board enables balanced inputs to an unbalanced input amplifier.

It came from a working Hafler PRO 1200 amplifier. You can see it has XLR and 1/4" input jacks. It has its own power supply that takes ~50VDC from the amp's rails and converts it to the ±10VDC to operate its circuit.

Details about this circuit card, board layout, and schematic can be found on pages 9 and 10 here:

http://hafler.com/techsupport/pdf/PRO1200_amp_man.pdf

How about $25 + postage? Let me know of your interest. Thanks
 

Attachments

  • balancedinput.jpg
    balancedinput.jpg
    50.9 KB · Views: 533