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To ICIETDIYEUR These are the measurements of the original D1. I don't have an opamp with JFET inputs right now, so I can't do the modification to the amp. But I think that with the djifet we will not notice the difference in measuring nonlinear distortions.Mainly the TPA chip distorts. But by...

Hi. I replaced the op-amp in D1 with LM4562 and the sound became much better. I could not find information on the network about the input type of this op-amp - bipolar or MOS. Judging by the value of the input current, it is MOS. The harmonic level did not change, the same with both 5532 and LM4562.

ICIETDIYEUROf, course, this is my subjective opinion, not confirmed by measurements. The result of long-term listening.Photo SMPS 24 V this is my photo, but from another amplifier. These SMPS are easy to find on the Ali website, they are also available for 48 +-5 V, 5 A. I recommend buying, it...

ICIETDIYEUR In my opinion, the parameters of the power supply are of great importance for amplifiers. Especially the value of the output resistance and its dependence on frequency. The SMPS of Topping amplifiers are very good.The sound of D1 with SMPS PA5 is almost the same as with a...

In my opinion, this power supply is the worst. I am 70+ and maybe these are my age-related quirks.

ICIETDIYEUR Thanks for the helpful advice. I noticed that the sound of the D1 is very dependent on the type of power supply. I have the best sound with a linear, transformer power supply. Please tell us about your network power supply. Tor 300 VA, Shotki, 15 mF.

To my ears the sound became better.:)

The frequency response of my D1 is very close to the frequency response of the A70. Only at a frequency of about 30 kHz and a load of 8 Ohms the gain is 1 dB higher.

Judging by the graph of the output signal level versus frequency, your amplifier is damaged. Probably, the PFFB feedback is disabled. In it.In my D1 amplifier, the frequency response is linear up to 20 kHz. Then a smooth decline after a frequency of 20 kHz. This is with a load resistance of...

Yes PFFB! TPA3251.

I replaced the NE5532 op amp with an LM4562 and now the amplifier sounds much better. I compared it with PA5 II and didn’t notice a difference. Very good.

If this is for me, then the seller emailed me the amplifier circuit, not the board. Now, I am sure that the cause of the amplifier failure is the strong heating of the TPA3255 chip, due to abnormal weather -36 degrees in the shade. After cooling, the amplifier works normally. .

Hello. I contacted the seller and he sent me the amplifier circuit. I pulled the board out of the case a little and turned on the power.I connected a generator to the input and checked the signal at the output. The amplifier suddenly started working absolutely normally. Both channels are fine. I...

My noorus D1 has started to crash, the signal at the amplifier output is disappearing. And on both channels at once. Looks like bad contact on the board, namely on the RCA input panels. We need to disassemble and solder. Colleagues, maybe someone disassembled this amplifier, I can't take the...

Ok!

I bought the O-noorus D1 amplifier because it contains PFFB. And indeed, its sound does not depend on the type of acoustics.I measured distortion at a power of 5 W, it turned out to be no more than 0.001% at a frequency of 1000 Hz.

And what is the difference between the A200 and the A50, except for the presence of indicators and the lack of access to the sub in the A200. And, of course, the prices are 270 and 80 dollars.

3eaudio, according to the datasheet, the maximum load capacity in the recommended power supplies should not exceed 2000 μF. The amplifier board is equipped with capacitors with a total capacity of 7200 μF. Will this cause the power supply to malfunction? PDF attached

The final price of the amplifier, including the housing, connectors, power supply, etc., will be close to the cost of, for example, PA7. But, the purchase of a branded amplifier is guaranteed by the manufacturer, and here... I bought a 3E board and assembled an amplifier in a DIY case, the...

Yes... Obviously, this is pure marketing. The same thing with PA5 II plus, the price is 80 dollars more PA5 II.