Hello, I am in the process of making some test equipment for out lab.
I need to build/buy a circuit that will output a 5V DC signal for 1 second than off for 1 sec and that it would be continuous.
there is a 24VDC and a 5VDC supply already in the test box.
Thank you in advance for your input. I have been reading on this forum for a while and there is a lot of smart people here that are willing to help a fellow out.
Hello, I am in the process of making some test equipment for out lab.
I need to build/buy a circuit that will output a 5V DC signal for 1 second than off for 1 sec and that it would be continuous.
there is a 24VDC and a 5VDC supply already in the test box.
Thank you in advance for your input. I have been reading on this forum for a while and there is a lot of smart people here that are willing to help a fellow out.
If you choose to build then the 555 timer as mentioned is a good choice. If you choose to buy then a line like these can be a good choice. You would be looking for a repeat cycle. They have (in some cases) DPDT contacts rated for 10 Amps AC. On some both the off and on time are individually programmable. There are countless manufacturers making them in all flavors. I like the plug in ability.
Also, if you build there are blank small cases available where you can build your own on perf board and insert the board in a blank plug in module. Nice because you can mount your adjustment pots and have easy access. Altech Corp makes some nice din rail mount enclosures.
hi G,
Its a variable resistor, I would suggest a 200K pot, this would enable you tweak the timing to 1s On/Off periods.
Most capacitors [2.2uF] have a wide tolerance about their stated values eg: +/-10% or more,, so the pot would be advisable.
he circuit above is working like a charm I am very happy, I need to add a LED to the output so that it blinks on when the 5v 1sec pulse is on. I tried to add one to the output but the LED stays on and keeps the voltage at a constant 3.3VDC or so. please help!!
the LED was connected on pin & and ground