Circuit Ideas for the engineer and hobbyist
Under Construction!
Basic opamp circuits (many useful ideas) 
inv. amp, non inv. amp, difference amp, inv. sum amp, non inv. sum amp, inv. high Z amp, fast inv. amp, non inv. ac amp, differentiator, integrator, current (sinking)/voltage conv., centre voltage gen., multivibrator, function generator, current source1 
Basic lowcost CMOS timer circuits made with CD40106
(on delay, off delay, oneshot pulse, multivibrator) 

Basic transistor circuits 

Some good 555 circuits 
No function warranty or responibility is given for the circuits presented here!
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