Personal computing discussed
Moderators: askfranklin, renee, emkubed, Captain Ned
Captain Ned wrote:Clearly the resistor at the top (I see red/black/red/gold) will win this race with its 2000Ω resistance compared to the other 4 (I see green/brown/red/gold) at 5100Ω.
just brew it! wrote:Yeah, but the IC appears to be crouching down in a defensive posture (front legs bent), in an attempt to ward off 2000Ω's advances. The 5100Ω at the bottom may be able to sneak up on the IC while it is distracted.
Captain Ned wrote:Whereas I assumed the IC was "looking for it" and the crouched legs were the rear legs. In that case, 5100Ω hasn't a chance.
just brew it! wrote:(Jeez, this got strange fast...)
just brew it! wrote:Captain Ned wrote:Whereas I assumed the IC was "looking for it" and the crouched legs were the rear legs. In that case, 5100Ω hasn't a chance.
I suppose that could be the case. I just assumed that pin #1 was at the head end. OTOH the keying notch (hard to see in that pic) does give that end more of a "buttocks" shape.
notfred wrote:just brew it! wrote:Captain Ned wrote:Whereas I assumed the IC was "looking for it" and the crouched legs were the rear legs. In that case, 5100Ω hasn't a chance.
I suppose that could be the case. I just assumed that pin #1 was at the head end. OTOH the keying notch (hard to see in that pic) does give that end more of a "buttocks" shape.
You both need to hand in your geek cards now. Pin 1 is clearly identified by the dot, easily visible in the band across the packaging without any need to try and spot the keying notch
SecretSquirrel wrote:I smiled and then showed my true nerd by stopping and considering what basic op amp circuit I could make using exactly those parts....
Since it is a single ended op amp, I figured a non inverting amp with a gain of 6.1 referenced to a virtual ground at 1/2Vcc was good enough. Yep, I'm a nerd.
just brew it! wrote:SecretSquirrel wrote:I smiled and then showed my true nerd by stopping and considering what basic op amp circuit I could make using exactly those parts....
Since it is a single ended op amp, I figured a non inverting amp with a gain of 6.1 referenced to a virtual ground at 1/2Vcc was good enough. Yep, I'm a nerd.
I wasn't sure enough about the rather blurry part number to take a guess at the type of chip...
SecretSquirrel wrote:I'm purely a software guy, so i have no clue what any of it means but perhaps this will help? http://i.imgur.com/qleuW.jpgNow that I go back and look, I'm not so sure either.
mortifiedPenguin wrote:SecretSquirrel wrote:I'm purely a software guy, so i have no clue what any of it means but perhaps this will help? http://i.imgur.com/qleuW.jpgNow that I go back and look, I'm not so sure either.
Captain Ned wrote:Does that do what I think it does?LN311 voltage comparator.
mortifiedPenguin wrote:SecretSquirrel wrote:Now that I go back and look, I'm not so sure either.
I'm purely a software guy, so i have no clue what any of it means but perhaps this will help? http://i.imgur.com/qleuW.jpg
mortifiedPenguin wrote:Captain Ned wrote:LN311 voltage comparator.
Does that do what I think it does?
just brew it! wrote:Sorry about that, misunderstood what you were saying.Yes, I know pin 1 is identified by the dot. The question isn't which end is pin 1; the question is whether pin 1 is at the "head" or "tail" end.
notfred wrote:Shame the chip isn't a 555, could have had all kinds of jokes about astable multivibrators
just brew it! wrote:notfred wrote:Shame the chip isn't a 555, could have had all kinds of jokes about astable multivibrators
Check out page 14 of the data sheet I linked.