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For Sale Linear power supply AC to DC 12v 5.5 Amp for hifi DAC, Router, DTH

Wharfedale Diamond 12 Series
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Sep 2, 2017
Package includes,
Power supply
Power adapter
Dc cable

Quoting price:9.5k
Months old:6

Shipping all over India at buyers cost. Fully functional.

Connect it to get good noise free, good bass sound in speakers. Good video quality.


Input voltage: AC230V

Output voltage: DC 12V 5.5 Amp

Front panel: Black

Dimensions: Width 210mm * High 70mm * Heep 257mm

Transformer Power : 100VA

Weight: about 4.5kg

Power Polarity: inner"+" external"-"

DC Head Size: Outer diameter 5.5mm, internal diameter 2.1mm

Technical highlights

All-discrete topology.

Single-pass, series regulator design.
No IC (integrated circuits) are used. This allows complete design control over all operating points and parameters for superior performance.
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 output noise (unloaded) is less than 13µV at 24VDC output (measured using a Tangent LNMP (low-noise measurement preamplifier) and a Fluke
187 50000-count DMM in ACmV mode). The output noise is even less when the output voltage is lower. This is much better than the noise of an IC
regulator based PSU tested under identical conditions.
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

Two paralleled high-current, highly reliable MOSFETs (rated at 18A each) serve as the "pass" transistor.
The high current rating provides a very high safety headroom against overcurrent damage.
The use of paralleled MOSFETs divides the heat dissipation, simplifying thermal management. Onboard heatsinks can be used which would allow the this PSU
to supply up to 1A continuous (with much higher peak currents). More sustained currents are possible by using larger, offboard heatsinks.
The negative temperature coefficient of MOSFETs prevents damaging thermal-runaway conditions that may plague conventional BJT devices.
No current-limiting.

The main purpose:

Upgrade XMOS CM6631 TE8802L etc. USB interface DC power supply
Various DC5V power supply set-top boxes, routers and other digital devices
A variety of USB-powered digital equipment, charging your mobile phone
A variety of digital devices such as amp/ DAC/HIFI audio player

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Robert Bose

Oct 24, 2008
Bangalore India
Dear Sir
is it fixed 12V or is it adjustable
do you have the link for the Chinese manufacturer who makes it
assuming all the technical info you posted is from that Website
is there any brand name for the product ?
Robert Bose


Sep 2, 2017
Brand zerozone, it is fixed for 12v, but you can connect separate step down transformer if you need less than 12. It cost around rs.300. I connected 12v, 5v at same instance
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