Hammond 107V 25K:600 Ohm Center-Tapped Miniature Audio Transformer

The 107V is a 107 Series miniature audio transformer with a 25K ohm centre-tapped primary (pins 1-3) and a 600 ohm centre-tapped secondary (pins 4-6), giving a 6.45:1 turns ratio. It is suited to driving a 600 ohm line from a very high-impedance stage, one of the line matching and output roles the series is designed for.

Power level is 150mw from 150 Hz. to 50 Khz., and the frequency range is 150 Hz. to 80 Khz. +/- 1.5db at +0, +10 and +20 dbm without D.C. saturation; frequency response is ±1.5db from 300Hz to 50KHz. Typical DCR is 1400 ohms primary (805/595 ohms) and 66 ohms secondary (33/33 ohms); the table gives 1300 and 70 ohms (+/- 20%). At 1.0 kHz, 1.0 V the primary measures 33.5 Hy and 131 K ohms, and the secondary 1.08 Hy and 3.79 K ohms. Maximum D.C. unbalance is 1 mA; dielectric strength is 100 Vrms.

Every 107 Series unit is epoxy potted in an attractive black molded case, and the rugged potting produces a completely sealed part that withstands severe environmental conditions. It will withstand soldering for 10 sec. at 260 degrees C, with a maximum ambient temperature of 85 degrees C; the casting epoxy has a workable range of -40°C to +105°C under a normal rate of change, not including thermal shock. The drawing notes that primary and secondary may be swapped.

It mounts on a PC board with pin-type terminals of min. 0.187" length and is RoHS and REACH compliant, with a shipping weight of 0.02 lbs (0.01 kg).