Model bwd 141 is an all silicon Solid State Sine and Square Wave Generator powered by self contained dry batteries or an optional internal mains power pack. The wide frequency range of 1 Hz to 1 MHz together with its output attenuator and level control makes it suitable for both bench and field work. A balanced output is available by connecting a centre tapped resistor across the output terminals. Sine or Square Wave output is available by switch selection Power ON is indicated by the LED on the front panel.