Linear DC power supplies were the mainstay of power conversion until the late 1970’s. With the advancement of switching power supply technology, linear power supplies are less popular today but still find themselves indispensable in applications that require very low ripple and noise. A linear power supply uses a big transformer to drop voltage from AC line to much lower AC voltage, and then uses a series of rectifier circuitry and filtering process to produce a very clean DC voltage. That low DC voltage is then regulated into the desired voltage level by a dropping the difference in voltage across transistor or IC (the shunt regulator). Typical applications of linear DC power supplies include but not limited to:
studio mixer/audio amplifier
low noise amplifiers
data acquisition - including sensors, multiplexers, A/D converters, and sample & hold circuits.
automatic test equipment
laboratory test equipment
anywhere that excellent regulation and/or low ripple is required
For three decades, Mastech has made variable regulated linear power supplies with exceptionally low ripple and noise, at a fractional cost of established brands. Our success has attracted a number of copycats with look-alike products. Over the last three years, we have adopted new designs that bring reliability and fault tolerance of a linear DC power supply to the next level. After three years of testing, we are happy to confirm that the new Volteq line of linear DC power supplies has met all of our expectations in terms of voltage and current regulation, noise, and reliability, and is the linear DC power supply of choice for most of our customers.
If you have an audio application, you should stay with the original design of Mastech linear DC power supplies for fan-less operation.
For all other applications, we recommend the Volteq linear DC power supplies because of the improved robustness due to over-voltage and reverse-voltage protection.
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