The biggest benefit I see when working with pulse soldering iron is speed and effectiveness. Of course when you don’t work, it stays cool this means it saves energy, doesn’t evaporates poisonous steam and there is no risk accidentally to burn yourself. Well this one even has has light source for better view when soldering. [...]

The idea of reading temperature via USB is very simple. Construction is reliable, precise and requires few components. Circuit is very simple as there is USB to UART converter IC used.

 
USB to UART conversion is performed via F232RQ chip from FTDI (Future Technology Devices International). Besides ability to convert this chip also can work in [...]

This filter was designed to filter 1kHz frequency of telemetric signal from environmental noise. Filter itself is very simple built with acceptable electronic parts worldwide. This filter can be used in any circuit because of it’s simplicity.

 
Circuit contains minimal amount of parts including one general purposes NPN transistor with coefficient 50…70 an more. Such filter [...]

Sometimes you just need to connect some device to COM port, but computer don’t have one especially laptop. There are two ways – go and buy USB – COM adapter or build one. So if you decided to build USB to COM(RS232) adapter, there is one of solutions.

 
This adapter is very easy to build as [...]

HQM1286404 is pretty old graphical LCD module but it is still popular. This LCD is controlled by KS0108 lcd controller via two segment drivers. LCD backlight color is yellow-green. I think this is good choice for many projects where graphical information needed because of several reasons – you can find libraries around the internet to [...]

The circuit of this Infrared(IR) detector circuit is a simple light relay which triggers when infrared light is applied to phototransistor Q1. This device can be used in control systems. When infrared light is OFF, Q1 transistor and relay K1 are normally closed.

 
When IR diode is transmitting IR light phototransistor Q1 opens and thus relay [...]

Who has a car know that smal scratch may cause a rusting which will expand even under painted areas. And fight rusting id pretty hard tas. And so there are lots of methods that car keepers using. Ones are using anti-rust coating… but it has shortcomings – succes depends on how good it have been [...]

So this time I decided to make pretty simple but powerful enough audio amplifier. For this I’ve chosen quad bridge car audio amplifier TDA7384 which has four input and four output channels with power capability 4×35W(4Ω).

 
If connect to car battery where operating voltage is about 13.2V, then each channel can give 22W(4Ω) – what is [...]

Can anyone imagine Christmas without a Christmas tree – especially controlled via web. This is of course fun project, but I believe it needs some efforts to make it work. This is a part of Thomas Pheifer’s WebServer project.

Circuit is simple using single MOSFET. Main problem how to send this single signal to control this [...]

Sometimes when you work on low budget projects of don’t want to go shopping for max232 or similar IC you can save your time and money by using other TTL to RS232 converter. We usually used to use MAX232 chip like this:

Max232 IC is a specialized circuit which makes standard voltages as required by RS232 [...]