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Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
so for my new revision of my firing system, I am going to make some PCBs, and have transistors do the driving of the cues from the BeageBone for network control. I originally was going to just use some traditional discrete NPN units with a negative bias to prevent interference in adjacent lines from causing a false firing trigger, but then I remember seeing transistor arrays in DIP packages and was wondering if anyone here has any experience with them, as I've never used them before. Any special requirements or notes for using a transistor array?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
This is somewhat of a vague question-- is there a particular device you have in mind?
It sounds like you are using the devices for setting off pyro charges, so I assume you are planning to use something with a good amount of current handling capability? I don't know of anything that is good for more than a few amps that comes in a DIP, the transistor arrays that I have seen in dip packages have all been for small signal applications (ex, that300 series) or are for driving small things like little stepper motors (ex, l298).
As long as you stay within the operating conditions in the datasheet you should be fine...
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
Yeah it's for pyro, I have been looking at some and haven't seen the specs of many of them, but I'd figure I asked if there were any quirks with using them beforehand (I have to do this with just about every unfamiliar part now for these systems, after a lot of "SPST" switches with LEDs turned out to be modified SPDT switches and I had a bad day debugging why the ignitors kept firing when one switch was opened and others were closed (turned out that because the switches were in fact mislabeled SPDT they were shorting to ground anytime one switch in a bank was left unused).
If anything I would have more expected interference tendencies or anything like that, so just asking around.
I may end up going with discrete parts to make it easier to service in the field, I'll have to do some PCB layout tests to see what I can come up with
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Octal darlingtons such as ULN2803 (and many similar) are common, cheap, reliable. seven per pack are also common due to 7-segment common anode led displays. Commonly use to drive small relays, motors, lamps, solenoids etc. (hence the diodes) The best choice depends on the final output quad opto-triacs driving power triacs are compact for 120/240 Vac many options available.
Since there is moderately high power being switched, they are a weak point ic sockets are ok but pins soldered to pcb track is better for heatsinking, smt even better. (I now find replacing smd ic quicker (and less chance of damage) vs. through hole)
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Sulaiman wrote ...
Octal darlingtons such as ULN2803 (and many similar) are common, cheap, reliable.
yes thats what i was going to say, the uln2803 and similar are just near bullet proof. Ive driven inductive loads with them and they're just great. So i second Sulaiman's comment.
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Transistor Arrays
