Rotary control adjust the amplitude or loudness of the output.
AMPLITUDE (0-5V) controls the overall output level.
The low impedance sockets, black and left yellow, give 0 to 5V
via a
loudspeaker or vibration generator.
The high impedance sockets, black and right yellow, give the
same voltage range, but at low power, suitable for input to
oscilloscopes.
The black socket is NOT a true earth as the output is fully
floating. Connecting the black socket to the green socket makes
the output signal change relative to true earth (0V).
ATTENUATION reduces the high impedance output signal ONLY, by a factor of 10 or 100. This gives controllable
signals in the range 0 to 0.5V or 0 to 0.05V (50mV). These attenuated signals are suitable for input to electronic
amplifier circuits.
The red and black sockets provide for a microphone input to the amplifier section of the signal generator. The
SELECT button turns off the signal generator and the LED indicates “aux.” A crystal/ceramic microphone is
recommended, with an output in the range 50 to 500mV. “Professional” microphones have much lower outputs
and are not suitable.
The black socket is NOT a true earth, but the screen conductor of the microphone should be connected to it, to
reduce interference from stray pickup.
