IBM 770 manual Audio Port Specifications, Line, Subsystems

Audio Port Specifications

ŸAudio Output:

– ⅛-inch mini-jack for headphone

– Headphone speaker output: 22 mW (32 ohm) maximum

– Maximum output level: 2.4 V pp

– Output impedance: 75 ohm

ŸAudio Input:

–	⅛-inch		mini-jack	for		microphone or line input
–	Microphone gain:				26-dB minimum, 48.5-dB maximum
–	Maximum		input level:
	Microphone:		1255		mV	pp
	Line	In:	4.0		V	pp
	– Input impedance:
	Microphone:		47	k	ohm
	Line	In:	30	k	ohm

3-8 Subsystems