Conford Electronics
Professional Audio and Process Control
Headphone Amplifier Box Specification
Frequency Response
+/-0.5 dB from 20 Hz to 20 kHz; - 3 dB 50 kHz
Noise
Less than -60 dBu (Note 1)
Distortion
Less than 0.1% from 20 Hz to 20 kHz
Gain Range
MIC
+20 dB to +60 dB
LINE
-20 dB to +20dB
Common Mode Rejection
Greater than 80 dB
Input Common Mode Clipping
Greater than 0 dB
Input Impedance
MIC
5 kOhms
LINE
120 kOhms bridging
Input Clipping Level
MIC
-10 dBu
LINE
+28 dBu
Output Impedance
Less than 50 Ohms for 32 Ohm to 1 KOhm headphones
Output DC offset
Less than 50 mVolts
Output Clipping Level
+15 dBu
Connectors
Input
XLR three pin female or 0.25 inch three pole A gauge jack combination socket (Note 2)
Output (Loop Through)
XLR three pin male (Note 2)
Headphone Output
0.25 inch three pole A gauge jack socket (Note 2)
Pin Connections
Signal Input and Output
PIN 1 (sleeve) GROUND; PIN 2 (tip) SIGNAL; PIN 3 (ring) RETURN To unbalance connect PIN 3 to ground
Headphone Output
SLEEVE: COMMON; RING and TIP: SIGNAL
PP3 Alkaline Battery Life
50 Hours typical
External DC Connector
2.5 mm centre pin positive (Note 3)
Dimensions
Width 80mm; Height 45mm; Depth 135mm
Weight
300 gm including battery
Notes to specifications
1.
Measurements of dBu are dB with respect to 0.775 volts
2.
Various adaptors are available to convert to alternative connector standards.
See Accessories
3.
The unit may be operated from an external supply between 6 and 12 volts DC (maximum) at 15 mA quiescent, 100 mA peak. The recommended voltage is 9 volts. The supply should be floating and regulated
4.
A fitted belt clip is available to special order
Operating Controls
Front Panel
Sensitivity Selector
Two position slide switch
Connectors
Audio input and loop through output
Headphone output
Headphone output
Rear Panel
Battery Holder
PP3 externally accessible
Power on/off
Two position slide switch with LED indicator
Connector
External DC supply
Top Panel
Level
Rotary Potentiometer
Conford, Liphook, Hampshire, GU30 7QW, UK
+44 (0)1428 751469
contact@confordelec.co.uk www.confordelec.co.uk/
Webmaster: John
+44 (0)1428 751469
contact@confordelec.co.uk www.confordelec.co.uk/
Webmaster: John
