Generator can be operated from a PC through LPT port, or using any driver Saa1057 which the electrode is a whole lot.

Source: mkpl

Bartek present solder station based on the pattern EP 3 / 99.

Source: Bartek Download: Soldering station

The DPScope is controlled by the DPScope software running on the PC. The user interface gives you full access to all the features of the DPScope like horizontal and vertical resolution, trigger settings, acquisition settings (e.g. averaging, pre- and posttrigger range), and so on.

Source: womai Kit: dscope

This simple  circuit is used to test  N-Mosfets and P-Mosfets transistors.

Source: Smjesko (elektronika.ba)        Download: Mosfet Tester.rar

USB – RS232 converter, uses only Tx and Rx lines, with selectable 2400, 9600, or 38400bps. PCB projected to fit in old mobilephone cable, most of parts is surface-mounted.

Source: diy.elektroda.eu Download Project: Converter USB – RS232

In this project Dilshan design an Inverter to convert 12V DC power source to 230V AC power. This system consist 3 main stages such as oscillator, switching circuit and step up transformer stage. In oscillator we use 4047 CMOS astable multivibrator to generate nearly 60Hz oscillation.

Source:Dilshan Download: Complete schematic and PCB diagrams

This is a small frequency counter with a cheap PIC microcontroller and a few seven-segment LED digits. The main features of the frequency counter are:
*   frequency range 1 Hz … 50 MHz (prototype worked up to 60 MHz but this exceeds the PIC’s timing specifications)
* four or five digits resolution (display for example x.xxx kHz, [...]

This is a simple capacitance meter which can measure capacitance value easy. There are some measurement methods for capacitance, at one time the capacitance was measured with a impedance bridge or a dip meter. Recently typical capacitance meters can measure capacitance and some additional characteristics from current vector by applying AC voltage to the Cx.

Source: [...]

In early 2005, NEC launched small pin count microcontrollers like PIC/AVR based on 78K0S architecture. The 78K architecture has a register set similar to i8085 and additional bit operation instructions. It can be saied that a stale architecture but the memory space is plain compared to PIC/AVR. There are various devices with application specific peripherals [...]

This is a simple circuit to connect your VGA graphics card to your TV. The advantage of using RGB over S-Video is superior contrast and clarity. The schematic of this circuit is taken from Tomi Engdahl’s site. The circuit basically XORs together your horizontal and vertical synchronization signals to create a composite sync output, and [...]

This is a simple circuit which can detect when you touch a sensor connected to one of the sensor inputs. It can be used to add a touch switch to your computer for example. It uses an AVR micro controller, the AT90S2313.

Source: Pontus