UMZCH with an output stage on field-effect transistors. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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UMZCH with an output stage on field-effect transistors. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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The amplifier is simple and at the same time has very, very good Features

Supply voltage	+/- 32
Rated (maximum) output power at a load of 4 ohms, W	45 (65)
Harmonic coefficient, % in the frequency range:
20 5000 ...	0,003
5000 20000 ...	0,01
Rated input voltage, mV	0,775
Rated frequency range, Hz	20 100000 ...
Frequency response unevenness in the operating frequency range, dB	0,25
Signal-to-noise ratio, dB	100
Output signal slew rate, V/µs	60

Amplifier circuit

(click to enlarge)

I will not describe the circuit in particular, I will only say that the thermal stabilization of the output stage is carried out due to the VT3 transistor, which is installed on the same radiator with VT5. HL1 and HL2 indicate amplifier overload and at the same time reduce the resulting signal distortion.

Output transistors are mounted on radiators with an area of 400 square meters. see Coil L1 is wound on a frame with an outer diameter of 20 mm and contains 28 turns of PEV-2 1,0 wire. Transistors KT3108 can be replaced with KT313A or KT313B.

The adjustment comes down to setting the quiescent current of the output transistors within 200 ... 300mA by selecting resistors R7 and R10.

The power supply for the preliminary stage of the amplifier can be assembled according to the following scheme:

UMZCH with an output stage on field-effect transistors. Source of power

Printed circuit board here.

Author: A. Ivanov; Publication: radiokot.ru

See other articles Section Transistor power amplifiers.

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Comments on the article:

Igor
The scheme is working. Collected from what was. Output tr-ry IRFP-250N, VT2, VT4- 2SA3318. Stabilized power supply (remade computer "on TL494", stabilization only on +). Works since 2010

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