Posted on Oct 1, 2012

If you need a wide-range, resistor-programmable monostable multivibrator, you can program tbe circuit for pulse widths from 1 JlS to 10s-107:1 range. A high-to-low transition at tbe input causes IC1`s output to switch low, thereby turning off Q1 and Q2. With tbe latter transistor turned off, IC3`s output increases and tbe output ofIC2 begins to ramp toward tbe negative supply level at a rate determined by the 0.01-JlF capacitor and tbe programming resistor.

Click here to download the full size of the above Circuit.

When IC2"s output voltagereaches -5 V, IC3"s output switches low. Ifyou anticipate input pulses shorter than tbe desired output pulses, Q3 is necessary. This transistor keeps IC1s input low while an output pulse is present, thereby preventing inadvertent resetting of tbe one shot.

Leave Comment

characters left:

New Circuits



Popular Circuits

from 42 to 88 Mhz Band
Amplifier Clipping Indicator
Impedance meter for Headphones
The Buck Converter
infrared receiver ir rx output waveform
555 IC Water Level Sensor/Detector Alarm
Search for Varicaps
Lighting inverter circuit principle 6 ~ 8W fluorescent