Re: FBSSTC-NEED HELP

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Fucian-at-aol-dot-com 

In a message dated 3/24/2004 12:30:40 AM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

>Things to check if you have no voltage out of the 7812:
>
>1) Is it connected the correctly? http://www.national-dot-com/ds/LM/LM340.pdf
>2) The heatsink tab is connected to the middle pin (COM) for positive
>regulators, make sure it is not shorting on either the input or output rails.
>3) Is the input voltage at least 15V?
>4) Add a 0.22µF cap across the i/p and  COM (7812s can oscillate and lock up)
>5) Ensure  the max current drawn is less than 1A.
>
>Tom L.


Hey sorry for the lack of response on the last post..-dot-computer crapped 
up...Im actually usuing a 1084...and its doing fine...Thas the 
bewilderment...I get 12 volts out...I traced the voltage into the 555...got 
12 volts out of pin 3 but no DETECTABLE frequncy...sometimes 60hz but my 
DMM seems to say 60hz even when not connected :-P

Anyways, i then trace the voltage to the 4420...its there...but nothing 
out...WEIRD ISNT IT? a 555 that has 12 volts out...and seemingly no 
signal?And then a 4420 that...does...nothing....

This is no joke...it probably seems to be...

Matt