The circuit was developed for use by Commentators at sporting events, however the circuitry lends itself to various functions as each block is available for use independantly if required.Two Microphones can be mixed together with an external Line feed, e.g. Effects. The Microphones can be set such that they 'duck' the level of the Line feed during commentary. Two external Line feeds can be fed into the unit for feeding two sets of headphones for reverse cue. The headphone 'amplifiers' are high level line drivers and suitable for most broadcast headphones.

The circuit board has the following functions:

* 2 Microphone Inputs, electronically balanced, suitable for a wide range
of microphones including Lip Mics. Preset gain adjustable -40 to -80dB.

* 1 Line Input stage, electronically balanced, can be linked to Line output
of Mic amps to provide preset 'ducking' of Line Input (e.g. sports effects)
during commentary.

* 1 Line Output stage, electronically balanced which provides 'mixed'
output of 2 Mic channels plus Line Input.

* Faders can be inserted at suitable points in the chain.

* 2 Balanced 'Headphone Inputs' with high drive Line amps for
200ohm and above headphones.

* All connections are via 0.1" Molex connectors and various combinations
of the system can be configured using these connectors.

Single PCB requiring external supply of +15v / -15v, a suitable encapsulated power supply is available from Lynden (part no xx-xxx).

A sample configuration is available on request. Finished units are available to order, housed in a sloping box with XLR connectors and external encapsulated Mains PSU.