Sowter Type 3678

60,200,600 / 5K Multi-Purpose
Input Transformer

PACKAGE OPTIONS Part Number
Coloured Leads 3678-F
PCB Mounting 3678-C
APPLICATION Impedance matching and noise isolation for microphone inputs. Taps for switching to 60, 200, and 600 ohm inputs. Suitable for desks with an input impedance of 5k0 ohms and above. Bessel response (minimal overshoot) obtainable by connecting a 5k6 ohm resistor across secondary if used with higher impedance desks.
FEATURES Mumetal core for minimal harmonic distortion. Heavy gauge Mumetal can for magnetic shielding.
INPUT TAP: 60 200 600
RATIO 1:9 1:5 1:3
MAXIMUM LEVEL 0.5 % THD at 50 Hz (40 ohm source) 0 dBu +6 dBu +11 dBu
DISTORTION at 50 Hz (40 ohm source) 0.1% at -6 dBu 0.1% at +4 dBu 0.1% at +8 dBu
INSERTION LOSS 1.68 dB 1.34 dB 1.09 dB
INPUT/OUTPUT BALANCE >50 dB >50 dB >50 dB
FREQUENCY RESPONSE (+/- 0.25 dB) 5k6 ohm load 15Hz to 45 kHz 15 Hz to 45 kHz 15Hz to 65 kHz

Pin 6/Orange : 600 ohms
Pin 5/Pink : 200 ohms
Pin 4/Grey: 50 ohms
Pin 3/Brown : common
Note: Pin 1 is marked for identification

E A Sowter Ltd
The Boatyard Cullingham Road
IPSWICH IP1 2EG England
Tel:+44(0)1473 252794
Fax:+44(0)1473 236188