#AUDIO ISOLATOR DRIVER#
#AUDIO ISOLATOR FULL#
#AUDIO ISOLATOR PROFESSIONAL#

It doesn't work with previous versions including the USB 1.0 or USB 1.1. Topping HS01 is compatible with the USB 2.0 transmission protocol. HS01 can reduce the ground loop noise by a huge margin ensuring top-quality performance with our HiFi DAC systems. It electrically isolates the DAC from the noise caused by the power flowing through the ground connections in the source device(In most cases, a PC).

You can call the HS01 a ground loop killer. It effectively improves the sound performance of DAC by reducing the background noise caused by the ground loop in the output signal.

#AUDIO ISOLATOR PROFESSIONAL#

Topping HS01 is designed by professional engineers with an aim to prevent the ground loop noise in the audio chain between the source and the DAC. So what are you waiting for? Grab the Topping HS01 today!! The Main Purpose Of HS01:. Topping HS01 improves the sound output of your desktop audio chains by greatly reducing ground loop background noise.

#AUDIO ISOLATOR FULL#

If you are facing ground loop issues in your desktop audio systems, the HS01 is a perfect Noise-isolator with fast USB 2.0 transmission support, Full metallic chassis, Low latency signal transmission, and many more advanced features. Thus common op amps, such as the 741 and LM324, will likely give poorer performance in this circuit due to their high noise and distortion.Meet the all-new Topping HS01, a high-speed USB ground noise isolator. The opamps shown are rail-rail types but standard types could be used if dual supply voltages are available.Īny op amp type used should have good performance (noise, bandwidth, distortion) over the audio range. Pot U2 adjusts to get the desired voltage output and compensate for the gain of the particular opto isolator you have. (A double-blind A/B listening test of music would be interesting). The simulated harmonic distortion is less than 1% at 1kHz for a 1 Vrms input, and the frequency response is 20Hz to 20kHz.ĭistortion doesn't quite meet high fidelity standards but should be inaudible in most audio applications (except perhaps to those with the proverbial 'Golden Ear'). The linearity degrades at higher operating currents due to reduction in the CTR of the opto but looks good if the maximum current is kept to no more than a couple mA or so (1.6mA maximum in this simulation). The simulation results are somewhat idealized of course, as determined by the accuracy of the models, and the real linearity will depend upon the actual characteristics of the opto coupler used, but should still be good, adequate for non-critical voice and music applications. (Note the blue trace where the output is graphically superimposed over the input so any non-linearities are more readily observed). If a symmetrical output signal with respect to ground is required, then the output can be capacitively coupled to a load resistor connected to Ocom.Īs can be seen, the output voltage plot appears quite linear with respect to the input.

R2 can be increased in value to increase the output voltage in this configuration, the tradeoff being some increase in the distortion. If you have a high impedance load (>1.5KΩ) and are satisfied with an output voltage of about 1/2 the input (depending upon the opto transfer gain), then U5 may not be needed and you can use the voltage across R2 as the output. Op amp U5 is a buffer/non-inverting amplifier that amplifies the voltage across R2 to convert the opto isolator output current back to a voltage.

The opto is operated Class A with about 1 mA DC bias current.

#AUDIO ISOLATOR DRIVER#

Op amp U3 is configured as a current driver for the opto input, generating a current proportional to the voltage input. (Ocom is the isolated output common and Rsim is just to allow the simulation to run with an isolated output ground). This eliminates the non-linear LED input voltage to current relationship, with the opto isolator output current typically being quite linear with respect to the input current, especially for low current levels.īelow is the LTspice simulation of such a circuit using the 4N25, a common and representative general purpose opto isolator.

There are special purpose (and relatively expensive) optical isolators available with separate feedback connections designed for high analog linearity and fidelity but, for non-critical AC applications, a standard opto isolator may be adequate if it is driven by a current source instead of a voltage.

Audio isolator