Thieaux

the input im using for transistor inverter is constantaly oscillating from 1 to 3 volts i need to get it to 0....cause im using the transistors output for a 555 timer, since its oscillating the timer keeps going off

Ok. Help me out here , i read on the forum the explanation on a voltage divider . Since the value of the resistence on the lower one is 100 , it takes less voltage to make the electrons flow , so since the less voltage is required it means that less voltage is flowing trough Vout, what i still cant understand is the ratilo u mentioned on the previous post .

Thanks for your patience , ill let you know tomorrow...

remember im new at this, would these changes in resistors make the transistor less vulnerable to voltage fluctuations, cause as i understand the base needs to be low at all times, so i need a way to stop the fluctuation at the base , how would i go about it, im sorry to be a nagg but i really want to understand this. So we need to find a way to make the fluctuations betwen 1.5 to 4 volts at the base come to "0" . iF the solution is by chaging the values of the resistors, could you explain why?

Everythings is ready and tested , works great , dont know how to thank you !!! Keep up the good work u sure are THE GURU!!!!! But i think ill have to tap the signal from the ecu directly to see if i can get a cleaner signal , cause on the locks it oscillates betwen 0.2 and 2.12 volts , making the system unstable. ;D

DONE!!!!! monostable done , with a 2 second "ON" time. All i need now is to make the transistor inverter , correct me if im wrong , but wouldnt that be 12v (resistor ) to base , and grond to the collector , so when the base glows, allows a path to ground?

U DA MAN, i was reading on monostables i figured that was what i need it, but u beat me to the punch , so here it goes : Pulse from the locks , to trigger the timer , 555 using an constant 12 v from the accesory or near voltage supply on the car . 1- Timing calculator for the buzzer? . 2- can the 555 power the buzzer or do i need a relay (radio shack 273-066) i think is rated at 125 milliamps? 3 does the inverter only works one way or it doenst matter what polarity comes in, he changes it to the opposite ? Regarding the third question, i asked cause the solenoid from the locks only use 2 cables that change from + to - depending on the function pressed (lock or unlock) Thanks

Went and got a pulsating buzzer from radio shack , i could use the momentary voltage to the lock solenoid to somehow activate a flip- flop that is power independently from a 12 v source , so when the voltage is applied for a second or so to the flip-flop it could activate it cuont the time and shut down. What do you think?

any help with the schematics? do i need to have a constant supply of voltage or could short pulse do the job with a cap?

How about using the signal from the keyless ecu, that sends a momentary 12v to the locks I could use that to trigger it , the problem is that im so new at this , and i have a lot of questions.... use the signal from the ecu with a diode , to trigger the oscillator, which in terms causes the counter to "count" and on the 4 output to reset of the oscillator . so ill be using a 555 and a 4017? Cause remember when i press my kkeyless remote i want 3 beeps confirmating that the car was licked, so ill be using the signal from the ecu to the locks. I/ve been told to use a self oscillating piezzo buzzer, but it defeats the porpouse of learning electronics.

Thanks man, correct me if im wrong , ill be using the led to trigger the counter , it would start the sequence, drive the beeper trough a transistor and stop, does it mater that the led would be pulsating as long as the car is locked or would go into a loop aqnd reset itself everytime the led flashes.?

High guys im a n00b at this, but i've been practicing a lot , i need some assistance on a project , when i use my keyless entry on my car it doesnt emit any sound or visual alert so i dont know if its open or not . i want to use the light from the security led to trigger my 555 so it can emit 3 beeps in one second to let me know that i've locked my car (that would be 3 hz?) 3 cycles per second right?...well anyway trigger it from the led , 3 beeps thats it . But can the 555 handle a very loud beeper im talking in hearing it a couple of feet away , i think in the 90 db range . but also the trigger could be the momentary 12 v pulse from the door locks , i would preffer the door locks , but since the pulse its very fast , could tha capacitor have a chance of chargin and powering the beeper ? IF anyone can help me with the schematics would really appreciate, THanks , sorry for the long post ...