Another movement towards finishing my “pet” project – an audio amplifier with remote control.
It was a hot, really hot, really very hot summer in 2012 in place where I used to live. I bought some cheap fan, though it was quite powerful, but there were two major drawbacks for me:
- No remote control
- No timer for scheduling switching off, let say at night. And I did not want it to make noise a whole night.
The original post has been written in 2012 year.
The time has came to build the PCB for the actual DIY audio amplifier. I decided to go with TDA7294.
During exploring of my stashes I stumbled upon those two bad guys:
Now it is time to provide an appropriate voltage supply for the audio-amplifier. Since I care about the noise and the amplifier is dedicated to work from the outlet only, I decided to move in the linear stabilization direction.
What do I want?
- The +12В voltage for coolers and relay, which in charge of the stand by mode.
- The +5В voltage for everything else, I have a lot of “everything else”, so I need to project a lot of different connectors.
- Powerful output capable to provide enough of the power for everything I have.
- To not forget to put all powerful transistor underneath of the radiators and coolers.
- Add outputs for indications and switches.
There are tons of articles out there, but I decided to make my own device at the moment:
I had thoughts to make such a device long ago, but at this point of time, the necessity of having this stuff increased significantly. Initially, I found a cheap CP2102 IC, it was cheaper than the huge FT232RL, which has a lot of redundant for me functions. Then I went shopping (here I’m talking about Belarus like 8 years ago) and realized that for us CP2102 is more expensive than FT232RL. Well, my choice was kind of obvious.Continue reading
After I had enough time playing with a thermal sensor DS18b20 and the RTC DS1307 I decided to bundle them together into a single device. Another reason was the fact that the cheap Chinese clock called a day and let its electronic soul leave the nice enclosure. I considered this as an opportunity to put my stuff inside of it.
That is what I got in the end:
+1 reason is that I had a free sample of the “port expander” PCA9539, I mentioned this IC in experiment #13.Continue reading
As you can understand from the title, this article is a short manual about assembling of the device which allows making the connection between your uart device and a PC by COM port.Continue reading
At that point of time, I did not have a lot of possibilities to buy any commercial development board, so I had to make my own
I wanted to make a small board, not those huge with everything you can imagine, and, perhaps, never going to use. A 3d model shows what I wanted and what I made: 4 buttons + 4 LED hanging on the PORTB. There is also one button and one LED for PORTA. Everything can be disconnected from the microcontroller using the dip switch.Continue reading