Assemble your own fully integrated high-fidelity constant current source power amplifier

The front part of the circuit is the input switching circuit. Here, a loop audio input switching TC TDA1029 designed by Philips Company for advanced audio is used . It can adapt to the switching of VCD, tuner, tape deck, high-fidelity video recorder and other
audio sources. There is no noise when switching and high fidelity. Its total harmonic distortion is only 0. o05%, signal-to-noise ratio S/
N -120dB, maximum allowable input voltage value Vin - 6V, voltage gain Gv - idB, crosstalk index is 70dB, and the operating voltage
range is 6~25V , The typical value is 12V port. This machine adopts 12V regulated power supply. The input circuit has 8 interfaces and can input 4 kinds of
stereo signals. The middle part of the circuit is a typical three-band equalizer composed of 2 NE5532, with excellent performance.
    The final stage of the 6-circuit uses two Philips high-fidelity power amplifier modules TDA1514A specially designed for digital audio equipment
(only one channel is given in the circuit ), connected in the form of a DC servo constant current source , so that the amplifier has a rich, thick, clear and lively tone
, which has the charm of a tube amplifier. Two pieces of TDA1514A are equipped with a professional wing-shaped aluminum alloy radiator. Output power POul
=50W×2 t, total harmonic distortion less than 0.08, conversion rate 15V/PLS, signal-to-noise ratio 85dB, ripple suppression 75dB, the power supply
can use a high magnetic permeability silicon steel core toroidal transformer, double Power supply, full-duration rectification, 2 1 0; OOOpcF capacitor filtering.
Both NE5532 and TDA102 9 are powered by stable hidden sources.