It is high performance DAC with oversampling, delta-sigma architecture and maximum sample frequency 192kHz/24bit. It has balanced voltage output. It is connected to high-quality operational amplifier which has low-pass filter function and buffer with single-ended output. Board also includes complete power part of circuit except transformer. In supply part I used two bridge rectifiers similar to other my dac boards.
Click here to download the full size of the above Circuit.
For supplying of analog and digital part of dac I used low-drop voltage regulators LE50. For supplying of operating amplifier I used common 78L12 and 79L12 voltage regulators. We must use transformer with two secondary windings with 12 to 15V. Winding for positive supply branch AC1 can be paralelly connected to S/PDIF decoder when we haven`t individual winding for them. All voltage regulators are properly blocked with ceramic capacitors 100nF and on the output filtered with electrolytic capacitors 47uF/16V. DAC and operational amplifier have also blocked all supply pins according to datasheet with ceramic capacitors 100nF and small electrolytic capacitors 10uF/16V. DAC is set to HARDWARE mode with pin MODE. It means, that settings are changed with setting right pins to LOG 0 or 1. With pins CSBIWO and ML/I2S is configured data format for I2S/24bit. This format is most common and is supported on all S/PDIF decoders and USB soundcards with I2S output. DAC has balanced voltage outputs. To them is connected 2nd low-pass filter with dual operational amplifier with very low distortion OPA2134. This amplifier simultaneously converts balanced output to unbalanced. Schematics of filter is adopted from AK4396 datasheet. On the output is connected small resistor which could prevent oscillations when not ideal load is connected. The output doesn`t need coupling capacitor, when parts are properly selected. I measured DC-offset voltage...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: