markelectro
New Member
Hello to all
I have a 555 timer circuit that I can't seem to get timing.
The circuit is using a trigger from an LED. and a photo transistor.The use of this circuit is for one of my other threads-
https://www.electro-tech-online.com/threads/1-sec-pulse-from-30-sec-clock.31429/#post235809
Basically when a pendulum swings in a clock it will break the beam of light to the light sensor (photo transistor) when this happens the the 555 will run for a given amount of time sending power through to an external device.For the purpose of the experiment I used and LED. for the external device.This does happen but the 555 does not time out.I want the 555 to time out after about 3 sec's.
When the transistor is receiving the light then the circuit runs ok (no power going through to the external device)
Due to my lack of electronics knowledge I am now at a loss.I have been at this for hours trying to get it to work.
Can you please Help?
Regards Mark
I have a 555 timer circuit that I can't seem to get timing.
The circuit is using a trigger from an LED. and a photo transistor.The use of this circuit is for one of my other threads-
https://www.electro-tech-online.com/threads/1-sec-pulse-from-30-sec-clock.31429/#post235809
Basically when a pendulum swings in a clock it will break the beam of light to the light sensor (photo transistor) when this happens the the 555 will run for a given amount of time sending power through to an external device.For the purpose of the experiment I used and LED. for the external device.This does happen but the 555 does not time out.I want the 555 to time out after about 3 sec's.
When the transistor is receiving the light then the circuit runs ok (no power going through to the external device)
Due to my lack of electronics knowledge I am now at a loss.I have been at this for hours trying to get it to work.
Can you please Help?
Regards Mark