The 148Q is a compact open frame driver transformer for printed circuit boards, matching a 10000 ohm primary to a 500/2000 ohm secondary. It suits engineers and repair technicians who need a small interstage or driver coupling transformer in low-level audio circuits, where a high-impedance stage must drive a lower-impedance load.
Like every unit in the 148 Series, it uses an economical, open type, horizontal bracket construction with pin-type terminals (0.25" length and 0.025" square) for P.C. board mounting. The windings are bifilar wound for balanced capacitive and resistance characteristics on pin bobbins that suit a standard 0.2" grid, and each unit is insulation tested at 250V rms. Pins are not labeled on the part; a dot marks pin 1 and the remaining pins follow the schematic figure.
Rated output is 75 mW with a maximum primary D.C. current of 4.1 mA. D.C. resistance is 1700 ohms on the primary and 238 ohms on the secondary (+/- 15%, total winding). Frequency response is 200 Hz to 15 kHz (+/- 1 dB, referenced at 1 kHz) and insertion loss is less than 1/2 dB, while total distortion is approximately 2% at 200 Hz for drivers, decreasing at higher frequencies. The dual secondary value (500/2000) gives two impedance options from the same part; wiring follows schematic figure 2.
Net weight is 0.6 oz. (148 Series) and the listed shipping weight is 0.05 lbs (0.02 kg). The 148Q is RoHS and REACH compliant, UPC 623980198200.
| Pins | 0.25" length & 0.025" square |
| Pin Spacing | Standard 0.2" grid |
| Mounting Type | P.C. board mount, pin type |
| Pin Identification | Pins are not labeled; a dot indicates the position of pin 1 |
| Schematic Drawing Figure | 2 |
| Series | 148 Series (Audio Open Frame) |
| Application | Driver |
| Product Type | Audio transformer, open frame PC board mount |
| Short Description | AUDIO TX DRIVER PC MOUNT |
| Net Weight | 0.6 oz. (148 Series) |
| Output | 75 mW |
| Insertion Loss | Less than 1/2 dB |
| Insulation Test | 250V rms |
| Total Distortion | Approximately 2% at 200 Hz (drivers), decreasing at higher frequencies |
| Frequency Response | 200 Hz - 15 kHz (+/- 1 dB, ref. @ 1 kHz) |
| D.C. Resistance Note | Figure is for the total primary or secondary winding (multiple windings connected in series) |
| Max. Primary D.C. Current | 4.1 mA |
| Primary Nominal Impedance | 10000 ohms |
| Secondary Nominal Impedance | 500/2000 ohms |
| Primary D.C. Resistance (+/- 15%) | 1700 ohms |
| Secondary D.C. Resistance (+/- 15%) | 238 ohms |
| UPC | 623980198200 |
| UNSPSC | 39121301 |
| Shipping Weight | 0.05 lbs (0.02 kg) |
| Winding | Bifilar wound for balanced capacitive and resistance characteristics, on pin bobbins |
| Construction | Economical, open type, horizontal bracket construction |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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The 148Q has a 10000 ohm nominal primary and a 500/2000 ohm nominal secondary.
The maximum primary D.C. current is 4.1 mA.
It is rated for 75 milliwatts output.
Pins are not labeled on the unit; a dot indicates pin 1 and the remaining pins are identified from schematic figure 2.
It is a pin-type P.C. board mount transformer with 0.025" square pins on bobbins spaced for a standard 0.2" grid.
Yes. The part is listed as both RoHS compliant and REACH compliant.
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