Electronics Forum / Basics / November 2008

I have an old stereo amplifier in whch some of the indicator lamps
have blown. Unfortunately two of these are enclosed in the VU meters,
I'm wondering if it's possible to open up the meters and replace them,
if not, hot glue some replacements to the exterior.

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CRANE AUTOMATION USING ABB DRIVES, PLCs,
Dear friends,.
We have been superspecialised in Crane Automation, and have done more
than 3500 jobs for Steel, Cement, Engineering industries. The

I have a query about two loudspeakers acquired from different
companies.
One speaker is larger and sounds better (softer) than the other
speaker.

Your company needs a physical recognition to display itself and that
is where the need of a logo design is felt. Logo is a good approach to
represent a business and also easy to remember.
http://www.logobench.com

I am playing around with a couple of CNC mills. One is a tiny HDPE thing
with a Dremel 300 series drill and the other a larger homemade creation with
a Trend T4 router.
Both the Dremel and the Trend are 240 VAC variable speed but my problem is

I have not understand some definition used with adc...
1)what is ENOB?A 12 bit adc with enob equal to 11 bit means that 11bit
represent the real value and last 1 bit is error affected?
2)what is "noise free resolution"?What is it's difference with enob?

A transformer is a device that transfers electrical energy from one
circuit to another through inductively coupled electrical conductors.
A changing current in the first circuit (the primary) creates a
changing magnetic field; in turn, this magnetic field induces a

I noticed some catalog listings for 'resonators', which are portrayed
schematically as a xtal with  two included caps to ground.
Are they xtals, or something different, and what are the pros/cons (if any)
over xtals?

Okay, so I have this motor and it is powered by a 24VDC power supply,
and I would like to vary the voltage going to this motor. This motor
draws 0.4A with 24V. I understand that connecting a pot normally to
this motor will burn out the pot rather quickly, so one must use a NPN

I found this old part in a controller of this elevator modernization I
am doing, and I am wondering what it is. Google searches have let me
down...
I think it is a voltage regulator... it is in a TO3 case and has the

I bought a big potted neon sign transformer on ebay, but both of the hv
insulators were destroyed in transit (this is me, having a positive
attitude...).
Anyway, I'm wondering where I might get some new ones to replace the broken

I have some electronics theory questions and some electronics
simulator questions pertaining to an Armstrong oscillator.  I have
done some reading and have tried to come up with a design on my own.
Most books just show a general diagram with no specific values.  I am

I have 2 broken PC mouses, one is optical, one is PS/2.
What can i do with the circuit inside that 2 broken mouses, something
fun???
Show me guyz, thx!!!