Multivibrators ( 12 ) :

Multivibrators are circuit which change their state contantlybetween different states (usually two states) at predefined rate.Multivibrators are usually used to generate square wave clocksignals, but they can be used also for other applications.

• Circuit forms clockless, programmable one-shot - replace the timing resistor on a 74LS123 one-shot with a Howland current pump, drive the pump with a rail-to-rail voltage-output DAC, and you have a programmable one-shot with some unique features: single-supply operation, no clock required, a 25-to-1 pulse with adjustment range, and an "infinite" pulse-width capability   
• D-flip/flop one shot circuits - you can use cheap D flip/flop logic circuits as nice one-shot pulse generators, this circuit shows how the popular CD4013 and the CD74HC74 can be used to generate pulses ranging from nanoseconds to seconds, pdf file   
• LM555 timer chip datasheet - very popular timing IC used for monostable multivibrators and oscillators   
• Basic IC MonoStable Multivibrator   
• CMOS RC circuits - oscillator, one-shot and button debounche   
• Discrete Multivibrator Schematic - astable multivibrator using discrete parts   
• Long period computer watch dog timer - simple 4060 IC oscillator/timer which is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state, time can easily be set from seconds to hours, pdf file   
• One-shot and latch circuit using CD4013 - pdf file   
• Retriggerable 555 Monostable Multivibrator   
• Simple monovibrator uses three PLD pins - if you can afford just three spare PLD pins, this circuit is an alternative to using yet another 555   
• Slow op amp makes fast multivibrator - improved version of classic one-shot multivibrator using an op amp, example circuit generates a pulse of approximately 700-�sec width with a 5-nsec, 2V triggering pulse   
• Switch De-bouncer Using a 555   

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