AF input module

When it comes to input selection in a preamplifier, the use of a relay is always better than a simple rotary switch - at least from a quality point of view. A relay obviates long signal paths to a common switch and may be controlled electronically. In the module a bistable relay is used since a standard relay needs a continuous energizing current. lt was felt that the slightly higher price of a bistable relay would be more than compensated by the high current requirement of the standard relay.