Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
After I posted, thought that was stupid. Have a machine that when it comes out of auto cycle, it puts out a pulsing signal that flashes a light on and off. The light got replaced with a tower light, so instead of just a green light going on and off, it now flashes two lights, green and yellow alternately. Would like to make pulse solid to keep on just one light. Hope this makes more sense. Thank you. Oh, 5 volts
You can google "retriggerable 555 timer (most likely answer most people will turn to first) but there are some issues.
I would use the very easy (two external components (1 cap, 1 resistor) for the timing, using a retriggerable astable CD4528.
use cap and resistor to set timing just slightly longer than the flash of either light. More circuitry will be required if you need this to turn off at the exact same time as the alternating flasher - otherwise the simple solution here turns off about one flash pulse late.
The output drive (current limit) is quite low so you'll need an NPN transistor as a low-side switch.
Ir sounds like the light has a circuit inside to turn the activation signal into alternating signals for the two colors. Are you asking about modifying the internal circuit so only one light comes on?
Thank you. Actually I/O board putting out pulse that turned on and off green light. No schematic on board. When tower light added, a relay was put in place of light, using no and nc contacts to change from green to yellow. When in cycle, pulse is solid 5 volts turning on relay, turning on green light. Cycle done, pulse on and off, turning on and turning off relay, cycles green and yellow lights. Would like to have either solid off or on.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
