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Hello all,
I am trying to generate a correct I2S signal to interact with my PCM1681 DAC using my FPGA. By default it uses a left justified signal but I want to use the "standard" I2S format. The datasheet states the following:
Next you can see my current signal. The data line alternates...
Hello all,
I am currently trying to get the verilog-ethernet project (https://github.com/alexforencich/verilog-ethernet) to run on my Spartan 6 xc6slx16. My PHY is connected via RGMII and the MAC uses two 125MHz clocks 90 degrees out of phase. As an input I have a 25Mhz clock. While there is a...
I have found this 4 channel half bridge IC called "STA515W". I think it is exactly what I need. The datasheet provides a sample circuit.
I would like to build it this way, but I am confused about C21. It says 2200uF but the symbol is not a polarized capacitor. Is this just a mistake or do I...
I found this commercial single bit audio encoding technique called Direct Stream Audio. It seems to me that it is pretty much PWM. They are using switching frequencies of around 12MHz and state state that signal frequencies up to 80kHz can be reproduced. So I think that this would also be...
Hey Klaus,
thanks for the quick response. As I said I am new to analog circuit design and don't have the lingo down. :-) Yes, I think a BTL amplifier is what I am looking for. I really only want to use a cheap PSU and I have one that produces positive voltage.
The first thing I did was search...
Hello all,
I am trying to build a very cheap circuit that contains a DAC as well as a Class-D amplifier. As an input I have a Zedboard FPGA. I want to generate a 1.8 V PWM signal and bypass the analog input stage typically found in the circuits that I found. The output load is a 4 ohm speaker...
Could you go into more detail please? I am very new to analog circuts. Is the type of wave important? Could I use a 100MHz square wave? How would the probes be connected? From the measured voltages how do I get impedance?
Hello,
I have a couple of SMD ferrite beads of unknown impedance. However, googling only lead me to solutions involving expencive equipment the cheapest being a NanoVNA as impedance is measured at 100MHz. I would like to know if there is a cheap circuit I can build to determine the values? I...
Sorry for the confusing question. I basically want to know what characteristics of an amplification circuit matter so that I can find a transistor "similar" to the one that I want to emulate.
Thanks for elaborating d123. Since I want to build an amplification circuit for a function generator I...
I am trying to recreate an amplification circuit for a waveform generator similar to the one I have described in https://www.edaboard.com/threads/trapezoidal-waveform-generator.398847/. I figured out the power transistors I need...
Thanks for all the suggestions. I will try to build my own DAC + amplification later on. After a summer break, I am still trying to figure out the original circuit design. I have followed the traces and created this circuit diagram:
However, I do not know what the SOT packaged transistors...
How can I find out? I know that the circuit I try to recreate uses something in the order of:
http://www.ben.cz/_d/datasheet/thermaltrak-an.pdf and http://www.onsemi.com/pdf/datasheet/njl3281d-d.pdf mounted to a thick piece of aluminium. here is a picture:
I actually have an FPGA at my disposal (Zedboard). It might also make sense to just buy a PMOD DAC and attach it to the board as an alternative to the PSoC5 approach. I'll have to check what would be the cheaper solution.
I found a cheap used FreeSoc2 (https://www.sparkfun.com/products/13714)...
Thanks Dana, that looks promising. I am really new to analog signal generation. What is the software you are using and what kind of hardware is needed to run the Wavedac?
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