The simplest voice FET amplifier board circuit

Published:2011/5/3 6:30:00 Author:Christina | Keyword: simplest voice, FET, amplifier board | From:SeekIC

The Hitachi MOS FET amplification has the sound Of nature, and it is used by many of the top machine. The writer use the Hitachi 2SK399, 2SJ113 high-power tube (cheap and easy to purchase, common) to weld a minimalist amplifier, the circuit is simple that has only 23 components. This circuit has the good price and it is worth to recommend. In the figure, Q1～Q3 use the 2N5401, 2N5551 (TV video amplifier tubes) as the differential and the main voltage amplification, because it has good frequency characteristics, good linearity and good effect. These amplification tubes can also choose the special fever tube, the sound quality can be further improved.Production requirements: the difference tube and the power tube should be matched to improve the open loop linear and improve the quality. HFEs' difference of Q1 and Q2 is ≤5％ when the current is 0-5mA, higher HFE is better. The resistor uses the metal film resistor. In figure 1, you adjust the W1 to make the output mid-point be zero. This circuit can increase the output power by adding the output tube or increase the supply voltage. When it is ±36V, 8Ω, the output power is 50W.



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