In this thread I will lay out the amplifiers that were made by me. The first will be this balanced amplifier.
Frequency range relative to 10 kHz (-0.1 dB) = 25 - 40 000 Hz
Frequency range relative to 10kHz (-1dB) = 8-125,000 Hz
Frequency range relative to 10 kHz (-3dB) = 4 - 250 000 Hz
Maximum output power (load 8Ohm, 1kHz) = 97.4 W
Maximum output power (load 8Ohm, 20kHz) = 96.7 W
THD + N (at Pout <= 60W, 20kHz) <= 0.0009%
THD + N (at maximum output power, 1kHz) = 0.003%
THD + N (at maximum output power, 20 kHz) = 0.008%
Maximum slew rate of output voltage (for differential cascade) = 225 V / µs
Maximum slew rate of the output voltage (for KUN) = 187 V / µs
Supply voltage range = +/- 20V ... +/- 60V
Rated supply voltage (100W, 4 Ohm) = +/- 36V
Rated supply voltage (100W, 8 Ohm) = +/- 48V
Frequency range relative to 10kHz (-1dB) = 8-125,000 Hz
Frequency range relative to 10 kHz (-3dB) = 4 - 250 000 Hz
Maximum output power (load 8Ohm, 1kHz) = 97.4 W
Maximum output power (load 8Ohm, 20kHz) = 96.7 W
THD + N (at Pout <= 60W, 20kHz) <= 0.0009%
THD + N (at maximum output power, 1kHz) = 0.003%
THD + N (at maximum output power, 20 kHz) = 0.008%
Maximum slew rate of output voltage (for differential cascade) = 225 V / µs
Maximum slew rate of the output voltage (for KUN) = 187 V / µs
Supply voltage range = +/- 20V ... +/- 60V
Rated supply voltage (100W, 4 Ohm) = +/- 36V
Rated supply voltage (100W, 8 Ohm) = +/- 48V
Attachments
OM mk11 by Nemo
I have built it.
Very good amp. It has bass drive even at low volume.
Very good sound stage.
But the draw back is, it has not enough headroom at high volume.
Highly recommended as integrated amp with passive volume control.
The amplifier sounds very good, the dimensions of the board are not large, it is better to assemble it as a double mono and in a separate package.
I advise this amplifier, the bottom is very pleased, the power depends on the power and the number of output transistors. Lazy man for those who are too lazy to count R3, R6:
Power supply ± 70 V - 3.3 kΩ ... 3.9 kΩ
Power supply ± 60 V - 2.7 kΩ ... 3.3 kΩ
Power supply ± 50 V - 2.2 kΩ ... 2.7 kΩ
Power supply ± 40 V - 1.5 kΩ ... 2.2 kΩ
Power supply ± 30 V - 1.0 kΩ ... 1.5 kΩ
± 20 V supply - CHANGE AMPLIFIER
It goes without saying that ALL resistors are 1 W
15V zener diodes desirable 1.3 W
By heating VT5, V6 - in this case, you can increase the radiators on them or increase their emitting resistors from 10 to 20 Ohms.
Power supply ± 70 V - 3.3 kΩ ... 3.9 kΩ
Power supply ± 60 V - 2.7 kΩ ... 3.3 kΩ
Power supply ± 50 V - 2.2 kΩ ... 2.7 kΩ
Power supply ± 40 V - 1.5 kΩ ... 2.2 kΩ
Power supply ± 30 V - 1.0 kΩ ... 1.5 kΩ
± 20 V supply - CHANGE AMPLIFIER
It goes without saying that ALL resistors are 1 W
15V zener diodes desirable 1.3 W
By heating VT5, V6 - in this case, you can increase the radiators on them or increase their emitting resistors from 10 to 20 Ohms.
Attachments
Bragin amplifier. Main technical characteristics:
Maximum power at a load of 4 Ohm, W 80
Maximum power at load with resistance of 8 Ohms, W 45
Nominal input voltage UMZCH, V 0,8
Input impedance kOhm 100 ... 120
Relative noise level dB not more than -90
Nominal frequency range, Hz 20 ... 20 000
Harmonic coefficient with a maximum output power of 80 W,%, at a frequency of:
1 kHz 0.002
20 kHz 0.004
Intermodulation distortion rate,% 0,0015
The maximum frequency at which the maximum power is reduced by 1 dB, kHz 50
The slew rate of the output voltage (without capacitor C2), V / µs 40
Maximum power at a load of 4 Ohm, W 80
Maximum power at load with resistance of 8 Ohms, W 45
Nominal input voltage UMZCH, V 0,8
Input impedance kOhm 100 ... 120
Relative noise level dB not more than -90
Nominal frequency range, Hz 20 ... 20 000
Harmonic coefficient with a maximum output power of 80 W,%, at a frequency of:
1 kHz 0.002
20 kHz 0.004
Intermodulation distortion rate,% 0,0015
The maximum frequency at which the maximum power is reduced by 1 dB, kHz 50
The slew rate of the output voltage (without capacitor C2), V / µs 40
Attachments
How do you fix the printed circuit board firmly to the heat sink?
Is the fixing of the transistors enough?
Is the fixing of the transistors enough?
Pre-amplifier. C7-C10 replace with 100nf and put in two, connect with the extreme terminals with variable resistance to the middle terminal with variable resistance to increase the upper frequencies of the nominal resistors with 750 ohms replace with 620om
Attachments
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