{"product_id":"sigma22-regulated-power-supply-board-hifi-ultra-low-uv-noise-field-tube-dc-servo-power-module-standard-diy-kit","title":"Sigma22 Regulated Power Supply Board HiFi Ultra-low uV Noise Field Tube DC Servo Power Module (Standard DIY Kit)","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- This power supply is based on the well-known high-performance DC voltage regulator circuit for Sigma22V2.0 at home and abroad. Its noise level is as low as uV, the background is pitch black, and it is as quiet as space. The overall sound quality is even higher.\u003cbr\u003e- By replacing the fine adjustment potentiometer, a dual power output of 5V-28V can be achieved, which is very suitable for use in preamplifiers, decoder DACs, ear amplifiers, and amplifier voltage stabilization.\u003cbr\u003e- The rational, stable, realistic, and natural balance of Sigma22 tends towards a monitoring style, and the effect is also good when using lower priced capacitors. When using high-level HIFI capacitors, there will be a small amount of personalized sound with capacitors on the monitoring basis, which is very beautiful.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTechnical Characteristics:\u003c\/b\u003e\u003cbr\u003e- Ultra low noise (μV level), high PSRR: Adopting a fully discrete single-stage error amplifier with a gain of 102.5dB, using capacitance multipliers to enhance PSRR (power supply rejection ratio). The overall process can be divided into three stages. The first stage involves differential amplification and current mirror\/constant current source; The second stage is the voltage amplification stage (VAS), and the third stage uses field transistors as source followers. What is commendable is that the output noise is only about uV level under the load! Without the use of IC, the entire design can regulate each control loop node to achieve optimal performance parameters for voltage regulation.\u003cbr\u003e\u003cbr\u003e- No current limit: In short, the MOSFET with large current output has no output current limit, as long as the heat dissipation is awesome. The bottleneck of output limitation lies in the wattage of the transformer, the rectifying diode, and the fuse (but note that the original version did not use fuses on the board). The characteristic of no current limitation allows S22 to support many instantaneous high current demands, especially for power amplifiers. Note: The version currently available in our store is a low current version, which is affected by rectifier diodes, heat sinks, PCBs, etc. It is recommended that the output voltage should not exceed 30V and the load current should not exceed 1A. The heat sink that comes standard with the kits and finished boards sold in our store can withstand nearly 0.2 watts of power consumption and can be estimated according to PT=VI (voltage difference*load current). When the heat generation is too large, it is recommended to use the chassis bottom plate for heat dissipation.\u003cbr\u003e\u003cbr\u003e- Ultra high bandwidth: The fully discrete design of S22 provides optimal bandwidth expansion. Due to the output impedance of S22 being even lower than the best and most expensive low-ESR electrolytic capacitors, S22 has a faster charging and discharging speed than traditional large reservoir capacitors. Surprisingly, the output impedance of S22 is only at the μohm level (usually the capacitance is about mohm level, with a difference of 1000 times). In fact, the test line used for measurement accounts for a larger proportion of the impedance, so the value is still overestimated. For capacitive loads, even up to 10000μF, S22 can remain calm and composed, which gives S22 more possibilities for application. The inflection point frequency of the low-pass filter is as low as 1.6Hz to prevent diode switching noise from entering the subsequent error amplifier. In addition, this part also has a soft start function.\u003cbr\u003e\u003cbr\u003e- Flexible and elastic output, low internal resistance: The output voltage of S22 is adjustable, mainly determined by the diode for Zener and the ratio of two resistors. The common output voltages are typical ±5V, ±9V, ±10V, ±12V, ±15V, ±18V, ±24V, ±27V, ±28V. The output impedance of sigma22 is much lower than the best low-ESR high-capacity electrolytic capacitors sold on the market. Due to its high bandwidth design, sigma22 can easily cope with the rapidly changing amplifier current requirements, ensuring that the back-end amplifier can maximize its potential. (Output impedance as low as μohm level, 1ohm=1000mohm=1000000μohm)\u003cbr\u003e\u003cbr\u003e- Positive and negative voltage automatic tracking: There is tracking between the positive and negative output systems, which means that the negative output will follow the positive output at any time. This makes the voltage symmetrical and greatly increases the common mode noise suppression ratio (CMRR), avoiding the popping sound of power on and off. The error of positive and negative voltages is less than 3%. If more precise consistency of positive and negative voltages is needed, the resistance of resistor R11=10K can be fine tuned.\u003cbr\u003e- Selection for Zener diodes and potentiometers corresponding to different output voltages (V2.2 version): \u003cbr\u003eWhen the voltage is ± 5-8V, the voltage regulator TL431 = 25V, and the potentiometer = 10K\u003cbr\u003eWhen the voltage is ± 8-15V, the voltage regulator TL431= 25V, and the potentiometer = 5K\u003cbr\u003eWhen the voltage is ± 15-28V, the voltage regulator TL431 = 25V, and the potentiometer = 2K\u003cbr\u003e\u003cbr\u003e- Input voltage requirement: Generally, the voltage difference after rectification of the input voltage should be 6-10V higher than the output voltage. [Calculation formula: Input AC * 1.414 - Output DC = 6-10V]\u003cbr\u003e- The relationship between the output DC voltage and the secondary AC voltage of the transformer is as follows:\u003cbr\u003e  Output: ± 5VDC, select 2 * 9VAC transformer\u003cbr\u003e  Output: ± 9VDC, select 2 * 12VAC transformer\u003cbr\u003e  Output: ± 12VDC, select 2 * 15VAC transformer\u003cbr\u003e  Output: ± 15VDC, select 2 * 18VAC transformer\u003cbr\u003e  Output: ± 18VDC, select 2 * 20VAC transformer\u003cbr\u003e  Output: ± 24VDC, select 2 * 25VAC transformer\u003cbr\u003e  Output: ± 28VDC, select 2 * 30VAC transformer\u003cbr\u003e\u003cbr\u003e- Heat dissipation: The heat sink that comes standard with the kits and finished boards sold in our store can withstand a power consumption of nearly 0.2 watts and can be estimated based on PT=VI (voltage difference * load current). When the heat generation is too high, it is recommended to use the chassis bottom plate for heat dissipation.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eInstallation Tips:\u003c\/b\u003e\u003cbr\u003e- This power kit, as long as you carefully follow the markings on the PCB board and solder the parts carefully without welding errors, can ensure a successful power on. Based on the experience of other customers, there are several points that need special attention:\u003cbr\u003e1. The constant current diode 2ma (202) and 5.6ma (562) are easily confused. Please note that the transparent diode in the ribbon packaging is 562, while the other two transparent diodes are 202. The silver diode is a ZD voltage regulator diode.\u003cbr\u003e2. The models of two power transistors differ by one letter, which can easily cause confusion and requires attention. In addition, when installing the power tube on the radiator, it is necessary to install insulation rubber particles and insulation gaskets! Otherwise, it will cause output short circuit and burn out the circuit board!\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Power Supply Board Kit\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1200px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102459\/102459-01.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products, Audio Amplifer and Decoders","offers":[{"title":"Default Title","offer_id":41029172068401,"sku":"102459","price":26.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0578\/4790\/6353\/files\/1780016985-1.jpg?v=1780396255","url":"https:\/\/www.thanksbuyer.com\/ru\/products\/sigma22-regulated-power-supply-board-hifi-ultra-low-uv-noise-field-tube-dc-servo-power-module-standard-diy-kit","provider":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products,  Audio Amplifer and Decoders","version":"1.0","type":"link"}