Electronics Forum / Basics / February 2008

I'm searching for an IC which can convert binary input to BCD code.
I have a TC77 temperature sensor, which provides data to 8-bit shift
register, and finally I have 8 bits in complementary code for negative
temperatures, and straight code for positive temperatures. Let's put

I've got an old Gralab darkroom timer with a buzzer that is, to my
taste, way too loud. Some Gralabs had a volume adjustment knob, this one
doesn't. I'd like to add one.
The buzzer is labeled:

I have a chip labeled MC14049U with the Motorola logo that I can't find a
datasheet for (specifically).  The MC14049UB datasheets I find show pin 8 as
Vss.  Does that mean it needs -5V applied to pin 8, like the 74HC4053 chips
I am working with?  Or should pin 8 simply be ground?

Not sure if this is the correct place to ask, but here goes... I've
found plans for a simple two transistor AM radio receiver, but I'm not
sure how the ferrite loop antenna is connected to the radio. I'm not
at all good with schematics, I can understand most of it except for

I changed the CRT HV anode wire on TEK o'scope by ...
- removing the silicon glued cover/cap
- desolder old anode lead
- clean silicon

can any one tell me about scan of body's viberation frequency

I'm in need of bit of help changing a small booklight from operating
with three white LEDs to one yellow or one orange LED bulb.  Assuming,
it can be done, for the moment.
Why you ask.  Because I have a friend who has E.P. (erythropoietic

Anyone here familiar with ST Micro
products?
I just tried to install ST Micro's
STM32 Starter Kit and PerformanceStick

[As I don't trust my ASCII skills, I won't try to draw schematics or
curves here. Images can be viewed here instead:]
Circuit schematics:
  http://thunderdome.myftp.org/diverse/battery/schematics.jpg

I have two Dremel tools. One is a couple decades old and has "solid
state speed control." The other is fairly new.
My old Dremel had much more constant speed under load, at any setting
of the speed control. The newer one, if you set it at a low speed, it

I was at the hardware store shelling out $20 for an "infinite range
control."  It is a proportioning control for an electric range burner.
It is primitive.  A small 3 W  heating element warms a bimetallic
leaf which moves a set of contacts, which opens the connection to the

plz.tell me what is thermister?

I have a 94' DEC 21" computer monitor that may have had 2 years
of actuall use on it.
some component died inside but i think the CRT is OK >?  it
looked great just before the caput.

hello guys! does any of you heard of a program/system that converts
html to dhtml? because it's our thesis proposal and i just want to
make sure that it is not existing. please help... ×_×

The two Pioneer spacecraft which were launched in the early
seventies,
have both been decelerating at a constant speed as they rise in the
sun's gravitational field (the rate of constant deceleration is