The circuit in Figure 1 satisfies all these criteria. The circuit delivers a unipolar (adjustable from 0 to 12V) pulse with adjustable frequency and pulse width. The first half of a dual, retriggerable monostable multivibrator, IC1A, generates the frequency of the pulse train. The 100-k potentiometer, R1, along with R2 and C1, sets the adjustable frequency. R3, R4, and C2 set the adjustable pulse width in the second section of the multivibrator, IC1B.
Hackaday You could use another 555 astable (using the same as the clock but changing the values). But a common choice is to use an astable and 555 as an Atari punk console (we have a detailed article on the punk console which ...
Experimenting with an HF , I needed to control the varactor diode voltage in precise increments over a 2V-10V range. A buffered potentiometer was the obvious choice, and connecting two pots in series to give coarse/fine control (or using a
Hackaday The 555 operation is almost identical to the astable , however the trigger input is not connected to the timing capacitor. This means the does not “self trigger”, requiring an input (in this case from the astable
NEW YORK, June 18, 2015 /PRNewswire/ -- This report analyzes the worldwide markets for Electronic Components in US$ Million by the following Product Segments: Resistors (Semi-Fixed Variable, Carbon Variable, Other Variable, Carbon Film Fixed, Me
Hackaday To merge the clock and chip-select lines, [Ralph]'s relies on a modification of a trick that he's previously used. Notice that the CSN line on the radio module is connected to SCK on the microcontroller through a resistor and capaci
IEEE Spectrum Immediately following the Second World War, electrical engineers grappled with a fundamental but open question: How should electronic digital computers be built? What kind of switch would serve best for logic ? And what should b
EE Times One could also use the comparator to create a one-shot or mutiviator for a special application. Regular multiviators or programmable are another possibility, while voltage controlled and alignable Xtal (crystal
EDN.com works on low supply voltagesThis sawtooth-, drawing less than 3.2 μA and working at under 1V, is a useful building block that fits the bill for extremely low-power consumption and operation to low supply voltages. It could be
Eetasia.com (subscription) With no flame present, the flame detector is essentially an open so that any charge on C3 will stay until the next clock cycle of the astable 33ms later. The TPS65552A senses the output voltage by looking at the f