All-discrete topology
Single-pass, series regulator design.
No IC (integrated circuits) are used.
Low noise, high PSRR
A constant-current source feeds a zener diode as a stable voltage reference. A low-pass filter (with a corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier. This is an effective yet lower-cost alternative to expensive voltage reference ICs. The low-pass filter also provides a soft-start characteristic.
The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB. The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio). This greatly improves the line regulation performance of the PSU.
A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load. The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.
High-current MOSFET pass transistors
The high current rating provides a very high safety headroom against overcurrent damage.
Onboard heatsinks can be used which would allow the σ11 to supply up to 0.3A continuous (with much higher peak currents-2A).
More sustained currents are possible by using larger, offboard heatsinks-2A
The negative temperature coefficient of MOSFETs prevents damaging thermal-runaway conditions that may plague conventional BJT devices.
Typical output voltages are 5V, 9V, 10V, 12V, 15V, 18V, 24V, 27V, 30V or 36V.
If you need other voltages, please contact us.
Do not short the output terminal to discharge capacitor, otherwise it will damage the power board.
Product configuration
DIY kit: Contains the PCB and the components needed on the PCB, but does not include the power transformer .
Finished board: Based on the well-tested board on the standard version kit, we verified all key points' voltage, and used the signal generator and oscilloscope for analog waveform double verification. We will not use this board for listening test.
All finished pcbs are all carefully hand-soldered and fully tests, so the price is higher and less cost performance. Price-sensitive consumers but with have DIY ability are recommended to choose the kit.
Schematic
PCB comes with component parameters for easy installation.
We only refer the schematic of the amplification part of the circuit. If you need full circuit parameter, please read the component value with the PCB by yourself; we do not provide additionally.
DIY KIT Instructions
Since the PCB holes are plated through, you only need to solder the parts from the bottom of the board. Do not drill or enlarge the holes because that would damage the through-plating.
Clean both sides of the blank PCB with paper towel and isopropyl alcohol or electronics flux remover, then solder the components to the board, starting with the lowest profile parts. This means the resistors and zener diode. Then solder the small capacitors, small transistors, followed by the larger capacitors.
Make sure the correct part goes into each position on the circuit board. Measure each resistor with your multimeter to ensure it's the proper value.
Pay attention to the polarity of electrolytic capacitors, diodes, , transistors as well as the orientation.
Clean up the solder flux residue from the board with isopropyl alcohol (or electronics flux remover) and a brush.
Inspect all solder connections carefully, using a magnifying glass, to make sure there are no solder bridges or cold solder joints. Use a multimeter in ohms scale to check for short circuits.
Typical Application
Input voltage VAC= (Output voltage +8)/1.414
For example:
12VDC-OUT,
Input voltage VAC=（12+8)/1.414=14.14VAC, Please choose 15VAC；
5VDC-OUT 9VAC-IN
9VDC-OUT 12VAC-IN
12VDC-OUT 15VAC-IN
15VDC-OUT 18VAC-IN
18VDC-OUT 18VAC-IN
24VDC-OUT 22-24VAC-IN
30VDC-OUT 26-28VAC-IN
36VDC-OUT 32VAC-IN
Parts list
Pics
DIY KIT
Pics
Finished board
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