Little to nil knowledge of digital logic. I need to switch 12v at say 100ma across 10 wires at around 1sec each . I must be able to start and stop the switching by applying around10v. (No not an assignment, I need to do it for me :) Could anyone point me to a webpage /circuit design source please ?
Cheers Jim
There was this little invention a few years ago called the transistor that might help :-)
Michael
Check out this site; the link goes straight to the circuit you want (substitute relays for the LED's - see the section in the site for interfacing relays to logic gates).
Cheers.
Ken
Hi Jim,
I am assuming you want the 10 wires to "take turns" at being energized? If so, have a look at this site:
It has 10 outputs (via a 4017 Decade Counter IC) which take turns one at a time. It requires a clock input (high/low) to time the outputs. Instead of LED's connected to each of the 10 outputs of the IC (like that shown on the site), you can connect a resistor and transistor to each of the outputs to switch current such as 100mA. If you're not familiar with this, I have provided another link below...
Hope this helps.
Jason.
and the clock source 555 ic or whatever can be powered by the 10v signal
Many thanks guys, the help is appreciated :))
Cheers Jim
Yep, 1947 I seem to remember. Before even I was born :) Strangely enough I was asked where a guy could get some background on valve theory the other day. They may be gone but they apparently aint dead :))
Cheers Jim
I've got a series of rather large glowing valves just a few metres from me. Not many transistors putting out 3kW just yet.
Cheers.
Ken
I'm still running a valve amp that must be over 35 years old. My parent's bought it before I was born. The amount of heat it puts out just sitting idle is amazing.
Michael
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