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Some power amplifier needs temperature monitoring.Some amplifier needs fan control like ALPHA BB.They´re builders who want VU-Meter or FFT real time visualization.All power amplifier needs AC main power filtering; perhaps controlled powering.Some power amplifier owner needs DC blocking.All power amplifiers needs inrush current limiter.Power amplifiers works with 115/230VAC 50/60Hz.Some owners wants volume control.And at last (but not least), some owners prefers symetrical inputs.
I already do, but a balanced one (plus a DC blocker trap filter in front of it) that looks like this internally.[IMG] https://www.computeraudiophile.com/uploads/monthly_2017_09/20170926_194113-1.jpg.465d8fe5474a6cbd36a0b90570ac9dea.jpgIt is connected to this star-earthed power distributor.[IMG] https://www.computeraudiophile.com/uploads/monthly_2017_09/20170926_193942-1.jpg.ee5469d436c687ac7c13ff8f640592b0.jpgThis balanced *floating* isolation transformer together with the LT3045s in series is actually the biggest reason why I want to build my LPSUs.As you can see on the picture there is a switch on the balanced isolation transformer where I can choose to *float* or *ground*. No contest in my setup. *Floating* sounds by far the best.
but now the board is TWO-layer design which allows the current handling capabilities of the board to be doubled. All current conducting traces are widened as much as possible which additional raise the max. handled current.PCB has solder mask coating on top and bottom layer for best durability.DC Blocker is built with following parts:– two MASSIVE 33,000 uF EPCOS capacitors– one high-current Rectifier Block– one 10W power resistor– one WIMA MKS4 400VAC capacitor– two MOLEX 3-terminal connectors for AC input/output– one PCB for DC Blocker.
Here is offered a fully assembled device capable to handle VERY HIGH CURRENTS (up to 30 Amperes!!!).Because of such high currents using a standard PCBs is not possible. Instead of that a 2mm thick pure copper bussbars are used to connect the filter’s parts.In order to carry such high loads the part’s values are upraised accordingly:– FOUR MASSIVE 47,000 uF High-Quality KEMET capacitors– 50 Amperes rated Bridge Rectifier– one 25W power resistor– 2 mm thick pure copper bussbars used for connection of the filter’s part.
...My AC mains is not bad, don't have noticeable transformer hum.I'm thinking to setup a DCB for my Parasound JC1 monoblocks amps, which use a 1,700VA transformer each. So maybe I should concentrate on getting enough current capacity rather than using DCBs in series, right?
The Study of Amplifier DesignAlthough solid-state amplifiers have been around for some 40 years, it would be a great mistake to assume that everything possible is known about them. In the course of my investigations, I discovered several matters which, not appearing in the technical literature, appear to be novel, at least in their combined application:* The need to precisely balance the input pair to prevent second-harmonic generation.* The demonstration of how a beta-enhancement transistor increases the linearity and reduces the collector impedance of the Voltage-Amplifier Stage (VAS).* An explanation of why BJT output stages always distort more into 4 U than 8 U.* In a conventional BJT output stage, quiescent current as such is of little importance. What is crucial is the voltage between the transistor emitters.* Power FETs, though for many years touted as superior in linearity, are actually far less linear than bipolar output devices.* In most amplifiers, the major source of distortion is not inherent in the amplifying stages, but results from avoidable problems such as induction of supply-rail currents and poor power-supply rejection.* Any number of oscillograms of square-waves with ringing have been published that claim to be the transient response of an amplifier into a capacitive load. In actual fact this ringing is due to the output inductor resonating with the load, and tells you precisely nothing about amplifier stability.
Here is offered device capable to handle VERY HIGH CURRENTS (up to 30 Amperes!!!) assembled in a steel case – black powder coated.Because of such high currents using a standard PCBs is not possible. Instead of that a 2mm. thick pure copper bussbars are used to connect the filter’s parts.In order to carry such high loads the part’s values are upraised with 4 x 47 000 uF capacitors, 25W power resistor etc.The capacitor block is firmly connected to the bottom of the case with brackets and rubber sheet...
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