Alt-BEAM Archive
Message #04363
To: beam@sgiblab.sgi.com
From: Dave Hrynkiw dave@solarbotics.com
Date: Tue, 08 Jun 1999 23:37:11 -0600
Subject: [alt-beam] Re: 1381 SE Analysis
At 10:16 PM 6/8/1999 , Senior wrote:
>I'm thinking this:
>1.) 1381 fires, motor starts up but creates huge voltage drop, circuit
>never latches, motor stops, voltage goes back up, 1381 fires. etc... How
>do I fix this? Replace the resistor? With what?
You can use a lower resistance, say, 1k. Especially if the motor isn't very
efficient.
>pin out of transistors (EBC I beleive) and 1381 (123) and what
>the parts on their schematic symbols are (The arrow on the transistors
>is the emmiter?) I would really appreciate it so I could verify.
Transistors with PINS DOWN, FLAT FACE TOWARDS YOU:
Emitter, Base, Collector
On a schematic:
- Emitter always has the arrow.
- Base is always the middle connection
- Collector is always the non-arrow on the other side
1381 with PINS DOWN, FLAT FACE TOWARDS YOU:
Output, Vcc (+), Gnd (-)
On a schematic, the 1381 is usually shown like an opamp (sideways trangle)
Vcc(2) -|\
| \
| \__Output (1)
| /
Gnd(3) -| /
|/
Regards,
Dave
ps: There's really gotta be a better way to build ASCIImatics...
---------------------------------------------------------------
"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
2 vowels. Pronounciation? _SMITH_".
http://www.solarbotics.com
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