The Stereo LM4766 Amplifier circuit is a dual-channel output system created with integrated components, delivering 40 watts per channel. This amplifier boasts an exceptionally low noise ratio and offers high-quality audio performance with a favorable price-to-performance ratio. It operates on a symmetrical power supply voltage of 2 × 28 volts DC.
In the output section, 20mm coils are utilized, which are wound with 20 turns. To facilitate this winding process, a 6mm clearance pen can be employed as a coil winding guide. The amplifier’s input sensitivity is set at 1 volt.
LM4766 Amplifier circuit:
LM4766 GENERAL CHARACTERISTICS
This power amplifier offers a total power output of 40 watts, with each channel delivering 30 watts when using the uninsulated NDL package with an unshielded metal sheath (LM4766T).
Utilizing a Self Peak Momentary Temperature Protection Circuit, the LM4766 combines discrete and hybrid amplifier technologies, ensuring a naturally safeguarded Dynamic Operating Area (SOA). It is also equipped with SPIKE Protection, offering protection against various potential issues such as overvoltage, undervoltage, overload, thermal issues, and momentary temperature spikes.
Each amplifier within the LM4766 features an independent pass-through mechanism, effectively reducing output bursts. Notably, this amplifier boasts an exceptionally low noise level of 2μV and an impressively low Total Harmonic Distortion plus Noise (THD + N) of only 0.06% at nominal power.
LM4766 AUDIO POWER AMPLIFIER DUAL 40-WATT
THD + at 1kHz at 2 x 30W continuous
average output power into 8u 0.1% (max)
THD + at 1kHz at continuous average
output power of 2 x 30W into 8u 0.009% (type)
Features
spike Protection
minimal amount of external components necessary
Quiet fade -in / out mute mode
Non-Isolated 15-lead TO-220 package
Wide Supply Range 20V – 78V
The LM4766 is a stereo audio amplifier capable of delivering approximately 40W per channel when used with the non-isolated “T” package and 30W per channel with the isolated “TF” package, providing a continuous average output power into an 8Ω load with a distortion level of less than 0.1% (THD+N).
What sets the LM4766 apart is its performance, thanks to the incorporation of Self Peak Instantaneous Temperature (˚Ke) (SPiKe™) Protection Circuitry. This technology elevates the LM4766 above discrete and hybrid amplifiers by establishing an inherently protected Safe Operating Area (SOA) that adapts dynamically to various conditions. The inclusion of Spike Protection ensures that these amplifiers are shielded at the output against a range of issues, including overvoltage, undervoltage, overloads, thermal instability, and momentary temperature spikes.
