The 5532 OpAmplifier, part 1
Design philosophy and schematics
Published in issue 406, October 2010
The most popular dual opamp in the world of audio is the (NE)5532. An interesting power amplifier can be made by connecting enough 5532s in parallel, how about 32 for a start? This may sound like a radical course of action, but it actually works very well, making it possible to build a very simple amplifier that retains not only the excellent linearity but also the power-supply rejection and the inbuilt overload protection of the 5532, which reduces the external circuitry required to a minimum.
Specification — per channel, 8 ohm load
Supply voltage: ±18.3 V
Input sensitivity
- unbalanced: 840 mV (16 W, 1 % THD)
- balanced: 833 mV (16 W, 1 % THD)
Input impedance
- unbalanced: 38.8 kOhm
- balanced: 93.6 kOhm
Output power, sinewave
- 0.1 % THD: 16 W
- 1 % THD: 16.8 W
Output power bandwidth: 1.5 Hz – 275 kHz
Slew rate: 5 V/µs
Rise time: 4 µs
Signal/noise ratio: (1 W ref.): 110 dBA
- 108 dB (B = 22 Hz – 22 kHz linear/unweighted)
Harmonic distortion + noise: 0.00055 % 0.0005% (B = 22 kHz, 1 kHz, 1 W)
- 0.0015 % 0.0009% (B = 80 kHz, 1 kHz, 1 W)
- 0.0006 % 0.0004% (B = 22 kHz, 1 kHz, 8 W)
- 0.0008 % 0.0005% (B = 80 kHz, 1 kHz, 8 W)
- 0.003 % (B = 80 kHz, 20 kHz, 8 W)
Intermodulation distortion: 0.0022 % 0.0012% (1 W)
- (50 Hz : 7 kHz = 4 : 1): 0,005 % 0.0015% (8 W)
Dynamic IM distortion: 0.0014 % 0.0011% (1 W)
- (3.15 kHz square wave + 15 kHz sine wave): 0.0035 % 0.0035% (8 W)
Damping factor: 194 (1 kHz)
- 111 (20 kHz)
DC-protection: ±1.5 V
Quiescent current : 300 mA |
Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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