whats the difference?

Thread Starter

Tony357

Joined Mar 24, 2015
37
I g
I can't do much to help you push large currents through copper coils with 4000 series CMOS devices. It just is not possible and whoever convinced you that it was possible is a fibbin'
I got the right power its just the coils are not firing the first one fires and holds and power goes nowhere else just freezes in the first coil
 

Thread Starter

Tony357

Joined Mar 24, 2015
37
I thought the circuit and question was familiar.

The coil is a load and the LED is a load. How would you connect them? What's different between the two loads?

There are a couple major differences. The current required to operate each device is different. So you'll need an appropriate driver. Secondly, you'll need to protect your IC. From inductive spikes.

I dont know how u mean the loads differ but let me try and explain this as im am a beginner in electronics.

Ok after the 4017 (on the output pins) i added a darlington pair of the same value. on the emitter leg i have one end of the coil and the other end of the coil going to the positive line and i did this for every coil but the current holds in the first coil why is this? and how do i overcome it?
 

lmarklar

Joined Apr 23, 2015
24
would you be able to use the 4xxx chip to run drivers instead? Maybe hookup something like a 8 channel driver that takes the signal in per channel and has it's own Vcc source and can drive a larger load based off of the timing coming from your 4xxx chip?

I'm sure there are more elegant solutions, but if you already have the parts and are just looking to keep it simple....
 

Thread Starter

Tony357

Joined Mar 24, 2015
37
would you be able to use the 4xxx chip to run drivers instead? Maybe hookup something like a 8 channel driver that takes the signal in per channel and has it's own Vcc source and can drive a larger load based off of the timing coming from your 4xxx chip?

I'm sure there are more elegant solutions, but if you already have the parts and are just looking to keep it simple....

I'll keep that in mind thanks
 

djsfantasi

Joined Apr 11, 2010
9,237
I dont know how u mean the loads differ but let me try and explain this as im am a beginner in electronics.
A coil needs more current than an LED. A coil generates back EMF (or voltage spikes) which needs to be handled by your circuit, or it could damage the driver. Like your darling ton transistors. One way to do this is with a diode reverse biased across the coil.
 

Alec_t

Joined Sep 17, 2013
15,117
on the emitter leg i have one end of the coil and the other end of the coil going to the positive line
The coil should be between the collector and the positive line. There should be a reverse-biased diode across the coil. The CD4017 should drive the Darlington base via a current-limiting resistor (try 4k7).
 
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