This power supply is based on the well-known Sigma22 V2.0 high-performance DC voltage regulator circuit at home and abroad. Its noise level is as low as uV level, the background is dark, the space is quiet, and the overall sound quality is improved. By replacing the trimmer potentiometer, it can do 5V-36V dual power output, which is very suitable for pre-amplifier, decoder DAC, amp and power amplifier voltage level voltage regulator. Sigma22's rational, stable, real, natural balance tends to monitor style, and the effect of using lower-cost capacitors is also good. When using high-level HIFI capacitors, there will be a small amount of personalized sound under the monitoring basis. , Very wonderful.Technical characteristics:1. Ultra-low noise (μV level), high PSRRA fully discrete single-stage error amplifier is used with a gain of 102.5dB, and capacity multipliers are used to enhance PSRR (power supply rejection ratio). The whole can be divided into three stages. The first stage is the differential amplifier and current mirror/current source; the second stage is the voltage amplifier stage (VAS). The third stage uses the field tube as the source follower. What is commendable is that the output noise is under the load, only about uV level This is three levels less than the common mV, which is nearly a thousand times worse. No ic use, so that the entire design can control each control ring node so that the performance parameters of the voltage regulator reach the Zui good state2. No current limitTo put it simply, the MOSFET with large current output has no output current limit, as long as the heat dissipation is enough. The bottleneck of the output limitation is the wattage of the cattle, the rectified diode, and the fuse (but note that the original version did not use a fuse on the board...). The feature of no current limit allows the S22 to support many instantaneous high current requirements. Especially the power amplifier. As long as you want current, S22 is ready. Remarks: This version currently on sale in this shop is a small current version, which is affected by rectifier diodes, heat sinks, PCB, etc. It is recommended that the load current does not exceed 1A.3. Ultra-high bandwidthThe fully-discrete design of S22 allows Zuijia to expand its bandwidth. Because the output impedance of S22 is even lower than that of Zui, Zui's expensive low-ESR electrolytic capacitors, the rapid charge and discharge speed of S22 is greater than that of traditional large pond capacitors. Surprisingly, the output impedance of S22 is only μΩ level (generally the capacitance is about mΩ level, difference is 1000 times). In fact, the test line during the measurement accounts for a larger proportion of impedance, so the value is still overestimated. For capacitive loads, even up to 10000μF, S22 can be at ease, which makes S22 more possibilities for application. The knee frequency of the low-pass filter is as low as 1.6Hz to prevent the diode switching noise from entering the error amplifier in the back. In addition, this part also has a soft-start function.4. Flexible output and low internal resistanceThe output voltage of S22 is adjustable, mainly determined by the ratio of zener diode and two resistors.Common output voltages are typically ±5V, ±9V, ±10V, ±12V, ±15V, ±18V, ±24V, ±27V, ±30V or ±36V. (even higher)The output impedance of sigma22 is much lower than the good low-ESR large-capacity electrolytic capacitors sold on the market. Due to the high-bandwidth design of sigma22, sigma22 can easily cope with the rapidly changing amplifier current requirements, ensuring that the back-end amplifier can realize the full potential of Zui . (The output impedance is as low as μΩ level, 1Ω=1000mΩ=1000000μΩ)5. Positive and negative voltage automatic trackingThere is Tracking between the positive and negative output systems, that is, the negative output will follow the positive charge at any time, which makes the voltage symmetrical, and greatly increases the common mode noise suppression ratio (CMRR), and avoids the popping noise of the switch.Selection of voltage stabilizing diode and potentiometer corresponding to different output voltages: (update data) When plus or minus 5~8V, regulator tube=3.3V, potentiometer=10K When the positive and negative 8~15V, the regulator tube = 3.3V, potentiometer = 5K (the kit is provided by default) When plus or minus 15-30V, regulator tube=3.3V, potentiometer=2K Need other voltage can consult customer serviceInput voltage requirements:After the input voltage is rectified, the voltage difference should be 6~10V higher than the output voltage.【Calculation formula: input AC*1.414-output DC= 6-10V】The relationship between the output DC voltage and the transformer secondary AC voltage is as follows:Output: When ±5VDC, the transformer selects 2*9VACOutput: When ±9VDC, the transformer selects 2*12VACOutput: when ±12VDC, the transformer selects 2*15VACOutput: when ±15VDC, the transformer selects 2*18VACOutput: When ±18VDC, the transformer selects 2*20VACOutput: when ±24VDC, the transformer selects 2*25VACOutput: when ±30VDC, the transformer selects 2*30VACOutput: when ±36VDC, the transformer selects 2*35VACAbout heat dissipation:The heat sinks standard on the kits and finished boards sold in our shop can withstand power consumption close to 0.2 watts, and can be estimated according to PT=VI (voltage difference * load current). When the heat is too large, it is recommended to use the chassis bottom plate Conduct heat dissipation.About school sound:This version of the calibration sound is mainly adjusted from the capacitor (different brand models and capacities have the opportunity to have different effects), and the transformer.Official information:https://www.amb.org/audio/sigma22/Specifications:Size and volume: 100mm*75mm*1.6mm (the center of the fixed hole is 4mm away from the edge of the board)PCB process: FR4 military grade, 1OZ copper, electroplating immersion gold.