Between ground and pins
RépondreOff. Switch unpressed
Circuit tension 8,5v
Pin1 0v
Pin2 8,5v
Pin3 106mv
Pin4 8,5v
Pin5 5,7v
Pin6 1mv
Pin7 1mv
Pin8 8,5v
On. Switch held down.
Circuit tension 8,5v
Pin1 0v
Pin2 0v
Pin3 7v
Pin4 8,5v
Pin5 5,7v
Pin6 1,66v
Pin7 1,65v
Pin8 8,50v
Pin 8 stays at 8,5v whether its off or on.Monitor the voltage on pins 7 and 8.
It should rise from 0V towards 9V with a time-constant of 4.7s when the button is pressed, and drop suddenly back to 0V when it reaches about 6V.
As it probably should. The schematic calls for a 9V power supply. Are you using a run down 9V battery? Or are you intentionally using 8.5V?Pin 8 stays at 8,5v whether its off or on.
What "off" mean. Pin 7 is an input.Pin7 is off at 0v and raise one sec then drop immediately. Now if i keep the switch pressed pin7 shows 1,65v
My power supply is a car battery charger. It provides 8,5v sometimes 9v.As it probably should. The schematic calls for a 9V power supply. Are you using a run down 9V battery? Or are you intentionally using 8.5V?
What "off" mean. Pin 7 is an input.
Does the LED stay on as long as you keep the switch closed?
Weird voltage for a car battery charger. Most batteries are 12V these days and chargers will put out around 13.8V.My power supply is a car battery charger. It provides 8,5v sometimes 9v.
When the circuit is first powered up, pins 6 and 7 should be at 0V because the capacitor is discharged. When you press and release the switch, the capacitor will start charging through R2. When the cap voltage gets to 0.67Vcc, the threshold comparator will toggle the state of the flip flop and the capacitor will be discharged.By off i mean when the switch is unpressed thats the value i get.
Pin7 switch unpressed = 0v
Pin7 switch pressed = 1,65v
Its an 80s charger. It delivers 4 outputs. 6v 9v 12v 15v.Weird voltage for a car battery charger. Most batteries are 12V these days and chargers will put out around 13.8V.
When the circuit is first powered up, pins 6 and 7 should be at 0V because the capacitor is discharged. When you press and release the switch, the capacitor will start charging through R2. When the cap voltage gets to 0.67Vcc, the threshold comparator will toggle the state of the flip flop and the capacitor will be discharged.
Since your switch is directly coupled to the trigger input, you have to release it before the one shot times out. Otherwise, the output will remain HIGH as long as the switch is pressed.
Does the LED stay on as long as you have the switch closed? If it doesn't, the chip may be defective. Where did you acquire it? Has it been previously abused?When i close the switch pin7 value goes up a fraction of a second then drop back. Current doesnt last
It stays on yes. The chip is fine. Im sure of thatDoes the LED stay on as long as you have the switch closed? If it doesn't, the chip may be defective. Where did you acquire it? Has it been previously abused?
Press and release the switch, then measure the voltage on the timing cap. If it doesn't start charging and continue to charge until the voltage is 0.67Vcc, verify that the capacitor and resistor connections are good.It stays on yes. The chip is fine. Im sure of that
Does the car battery charger have a filtered output? Many rely on the connected battery-under-charge to provide the filtering of the rectified output. If it isn’t, your circuit will experience the rectified AC output. Try adding 100 uF across the supply and set the ‘charger’ to the 6V setting.My power supply is a car battery charger. It provides 8,5v sometimes 9v.
The quality of your power supply and wiring are being questioned. Have you put a filter cap across the power supply?Not sure its useful but when i maintain then switch closed cap raise at 1,6v the same value as pin6 and pin7
Wow bro bro bro.. bro !!!Does the car battery charger have a filtered output? Many rely on the connected battery-under-charge to provide the filtering of the rectified output. If it isn’t, your circuit will experience the rectified AC output. Try adding 100 uF across the supply and set the ‘charger’ to the 6V setting.
Do yourself a favor and start using a better power supply. Surely you have a bunch of USB chargers laying around.Wow bro bro bro.. bro !!!
Of all the verifications i made so far, i never thought the problem could be because of the charger being incompletely filtered. I placed a 100uF cap in parallel and boom a solid 5 sec light. The multimeter did monitor shacking AC values. Dammit you re quicker than all the facebook forum amateurs and french forum electronicians combined in here. I can move on to astable now