Is there a low-noise power supply for low current applications?

Is there a low-noise power supply for low current applications?

Here is a quick article describing a low-noise power supply for low current applications. It’s simple, and easy to build. All parts are widely available and cheap. I’m using this power supply to power-up my RIAA preamplifier. It’s more that capable of delivering excellent results. Build one and try it for yourself.

Is the noise a problem with a preamplifier?

All preamplifiers boost signal, but most also introduce noise – an undesirable signal which, when strong enough, can lead to poor or no reception.

What is the noise density of a power supply?

In summary the noise performance is excellent and I call that a low-noise power supply. Here are some measurements: The graph shows a total voltage noise of about 113 Vrms. We can use the result and calculate to noise density over range of 100kHz. Now we could go and do this with absolute precision by integration.

What kind of power do I need for a PA18 antenna?

Includes low-loss power inserter, two 36″ weather-proof, high-performance coaxial cables, and 12V DC power supply. Helpful Tip: To determine if you need a PA18 Preamplifier, first make sure your antenna is pointed in the direction of your local broadcast towers.

How is a positive regulator used in a low noise amplifier?

The schematic above shows the basic implementation of a positive regulator. A zener diode and a constant current source define the voltage reference. The resulting voltage (Vref) is then applied to the non-inverting input of a low-noise operational amplifier /error amplifier/.

How does load modulated ripple affect op amps?

For op-amp audio applications, the load-modulated ripple problem is not critical, because it means that the power rails will fluctuate with the music, which affects the music but it’s complementary to it. The effect is a “flabbier” sound, and an increase in stereo crosstalk.