Recent content by UAN

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.

Please look at how the op-amp power supply is made on the PA5 II board. Unipolar, that is, the 4th pin of the op-amp is connected to ground, or bipolar? And measure the op-amp supply voltage.

Okay, I think that the amplitude of this interference (5 V) is not enough to damage the DAC output switch. Most likely the damage is due to poor quality of the chip. But we still have to watch.

Hello, S=klogW. My E50 DAC connected to the input of the 3E amplifier was damaged. The output switch chip in the DAC is damaged, which disconnects the output of the LPF op-amp from the TRS socket. I used an oscilloscope to measure the pulse amplitude at the input of the ZE amplifier when the...

3eaudio, your amplifiers are interesting in the DIY version.

I did not notice any difference in the noise level or distortion when connecting the ground wire of the board input connector to the TRS socket pin. I left it so that the wire did not hang.

Симметричный сигнал использует для передачи три проводника: два информационных (прямой и обратный) и один заземление. На фото разъема: красный – прямой +, черный - обратный -, желтый - земля. Соответственно, желтый цвет должен быть подключен к контакту заземления розетки TRS. На этом старом фото...

Корпус штекера подключается к корпусу усилителя через розетку TRS, то есть заземляется. Что значит заземлить сетевой вход? Высокий уровень шума, 125 дБ, — это шум генератора, то есть проигрывателя компакт-дисков.

Здравствуйте, я удалил свои измерения, потому что мое оборудование не сертифицировано и размещать любительские измерения на таком авторитетном сайте некорректно. P.S. Что касается звука, то усилитель 3E мне нравится больше, чем PA5 II.

260-2-29a PA5-II I deleted my measurements, the amp sounds good and ok... Once you assemble the amplifier, be sure to test it.

This is an old photo, it's better to ground it.

I now have a cheap power supply from Aliexpress 38 V, 9A. Shelf noise 140 dB at 5 watts, the amplifier sounds very good.

Please tell me what changes you made to the board to reduce the gain.