Each board contains the following circuitry:
* Two Microphone Amplifiers with provision for On-Board Llundahl LL1528 Mic transformers if required
* On-Board Opto-isolated muting of Mic Amps via a relay with external floating contacts for tally etc. Mic amps are muted at input & output
* Two line Drive Amplifiers with electronically balanced Outputs.
* Line Amps have gain trim on board of +/- 10dB.
If Microphone Input transformer is not used, the transformer is linked out and +input used.
The relay coil is 12v as standard.
A Standard Eurocard (160 x 100mm) with DIN41612 type C (32/64) edge connector.