This site has examples of commonly used IC's with a PCB layout that can accommodate most applications. The circuits are given, with the PCB layout and the values of the components.
The PCB makes it easier and faster to construct, but one has to follow the construction sheets very accurately, as the board has been designed to accomodate various applications of the devices in question, and placing a component in the wrong position, may lead to some surprises!
1) The first project is a 555 timing device with a relay output and a inverted input. These features can be left
off, and the values can be changed to accommodate a specific requirement.
2) A dual op amp PCB (Most dual op amps have the same pinouts), this can accommodate filters to mixers
and again a construction sheet is needed for the application required. 15 circuits can be built on this board.
3) The impulse generator for producing hydrogen for car fuel. I dont go into the specifics of electrolytes, and
electrodes, but that can be found elsewhere on the internet. You will find the impulse method of generating hydrogen (and Oxygen) is more effective using pulses. Normally Hydrogen is generated on demand, and with one electrolyte cell, it is not enough to drive at higher speeds.
The frequency generator is set up to produce the most gas in any given time, and the frequency and the duty cycle of this generator is set to perform this function, The impulse oscillator is the way of adjusting the amount (speed of engine) at any given time. One will find the optimum settings, then rewire the generators to function with these settings.