Electronics Projects, STK428-610 Amlifier Circuit 2X70W Hi-Fi article
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Amlifier Circuit STK428-610 This component is the core of the entire device, therefore, on the choice of the appropriate solution placed particularly great emphasis. In the first project of this work have already been given individual of the working class, which are the switch amplifiers characterized. Between the circuits of SANYO, I chose STK428-610, which has an output power 2x70W under load 4Ω and total harmonic distortion less than 0.1% up to 70% of the output power. This circuit, however, in our market it is not hard to come by, therefore, had to be ordered from the U.With.And. Hybrid technology allows you to minimise external components, and thus the formation of distortion due to the influence of parasitic parameters of the pcb and passive components.
Amlifier STK428-610 Circuit Schematic
Circuit STK428-610 is not yet equipped with the technology of the DPP, but even though it is from the point of view of the parameters and the design very promising. STK428-610 also contains the synchronization with the AM tuner, as its own switching frequency is 420-that 500khz, thus moving in the band of AM broadcast modulation. However, this function in the draft will not be used and will be blocked. The STK428-610 Amlifier circuit further includes various kinds of protections, such as protection against overvoltage, thermal protection circuit, etc.
STK428-610 PCB Drawings
stk428-610 part list pcb schematic all files alternative links: stk428-610-amlifier-circuit-2x70w-hi-fi.rar alternative link2
STK428-610 preamplifier circuit: PT2317B Digital Preamp Circuit
STK428-610 Power-supply circuit: 2X30V 250W Audio Amplifier SMPS Power Supply TOP249Y