The LM1895 and LM2895 are low‑noise audio power amplifiers from National Semiconductor. The LM1895 operates from 3 V to 9 V and can deliver about 1 W into a 4 Ω load, while the LM2895 is offered for higher supply voltages in an 11‑lead package. Both devices are aimed at compact AM‑FM radios and battery‑operated tape‑player amplifiers.
The document provides absolute maximum ratings, electrical characteristics, typical performance curves, schematic diagrams, external component recommendations and application hints for achieving low noise and high linearity in AM radio environments.
| Supply voltage range | 3 V – 9 V |
|---|---|
| Output power (LM1895) | 1 W into 4 Ω at 6 V |
| Input impedance | 150 Ω |
The LM1895 is designed for a supply range of 3 V to 9 V, which is ideal for battery operation.
The LM1895 can deliver about 1 W into a 4 Ω load when powered from 6 V.
Typical applications include compact AM‑FM radios and battery‑operated tape‑player amplifiers.
Using an external capacitor C1 to limit bandwidth and provide loop compensation yields a signal‑to‑noise ratio above 60 dB.