astable

Hi, I have to keep my frequency ~800Hz which means T = 1.25ms. Using a variable resistor, I have to get a duty cycle of 65% (which I achieved @ Rpot = 23.5k ohms) and 15% when the potentiometer is at 0. However when I try to trial and error simulation values, my output waveform doubles per...

YAG ::= Yet AGAIN Hi Gang! I need some help with a NE555. I'm looking for a SLOW flasher preferably about 0.5 sec on and then off for 0.5 seconds. So my brain is getting rusty. ;)A 1-second astable oscillator with a 50% duty cycle. This flasher is for a warning lamp in a flight simulator and...

Hi all, I've build the astable multivibrator with 2N2222 transistors. As you'll find many examples of on internet. All works, but I'm still wondering why it won't start oscillating after cold start. I've read other threads and they mention for example "Since no two devices are identical, one...

I have been working on a circuit to turn a motor on for several seconds, and then off for a longer period, using a 555 astable circuit. The on time needs to be around 5-10 seconds, and the off time needs to be about a minute. To get around the 50% duty cycle issue and allow for a longer off...

I need help with setting up pwm generator with variable frequency and duty cycle from around 10 Hz to 150 kHz, with important parameter of time 20 ns or less for the shortest pulse width. What kind of IC can i use in completing such circuit (not 555).< My profesor suggested using CD4538 IC >