Note：The product is Test OK finished board with 2 Type I 10000uF/50V filter capacitors.

Product Details:

HP-2-PSU super-parallel class A regulated servo power supply, low internal resistance, high precision, excellent transient response, very suitable for grinding DAC, preamplifier, power amplifier in the voltage amplification stage and input stage, the effect is good, the actual listening The low frequency is rich and the high frequency is delicate. The standard version uses ST BD139-140 as the adjustment tube, and can also be replaced with a tube of the same foot such as Toshiba A1358-C3421, but please pay attention to the pressure resistance problem, different tubes will have a slight effect on the tone, BD139-140 has a better High cost performance, and the A1358-C3421 will feel better. The output voltage and input voltage (DC) are recommended to be no less than 4V differential pressure. A 5-8V differential pressure is recommended. If the differential pressure is too low, the filter and voltage stability will be affected. If there is too much pressure difference, a large amount of heat will be generated. Please pay attention to the heat dissipation of the tube. Reasonable setting of input current, generally set higher than AMP quiescent current 30%, too high will make the sound will be dull, high voltage and high current, please pay attention to the heating problem of the adjustment tube, using the chassis cooling is a good choice. Highlights: 1. Use double bridge rectification, one transformer can be used when configuring dual independent system 2, very low noise <350UV, very high voltage stability. After the thermal stability, the full / no-load regulation rate is <0.5%, the voltage does not drop after the load 3, the voltage can be adjusted from 8V-60V according to requirements. The current can output 10MA-1.5A (depending on the rectifier tube and the adjustment tube)

Remarks:

1. Choice of R1： Output current = 0.65V / R1 R1 = 10R version of the positive and negative power supply are reserved for two resistance bits, generally with the front stage or voltage amplification level, select a group of 10R can be, if you want to play more extreme, you can press the above Formula, single or double resistance through the reserved resistance bits on the board to calibrate the desired sound 2. Selection of R2： When the output voltage is 12-30V, use about 10K When the output voltage is 30-50V, it is about 15K. When the output voltage is 50-70V, it is about 22K. 3. R3 selection： When the output voltage is 12-30V, use 4K-5K, When the output voltage is 30-50V, use 11K-12K When the output voltage is 50-70V, use 12-16K

Package List:

1 × HP-2 Power Supply Board