Electronics Forum / Electronics / January 2006

I have a circuit with many transistors in TO126 package that have to be
cooled.
They should be mounted onto a grounded Heatsink but the collector has
RF on it and this node is very capacitance sensitive.

    I request an audio compression chip, the data after compressed
would be transported through net wire, and the data should could be
decoded in PC and played  in PC, I could not
find a kind of chip, can you help me? thanks

Can anyone please help me to find a datasheet, or at least pinouts for the
Texas Instrument  TSP5220CNL voice synthesis chip.
Or where I might find them. I have checked Datasheets.or.uk,
Datasheetarchive.com, Alldatasheet.com, Chipdocs.com, Datasheets4u.com,

I need to put a turn indicator blinker system on my 6 Volt vehicle.
I'm looking for a circuit to provide the timed flashing, maybe using a
555 IC.
Thought there'd be lots to find, but no. Any reason a 555 can't be used?

I am wanting to check a AC line (15VAC) using a opto isolator, basically
just having it trigger a logic output so I can detect if the AC line is
there or not. I think a AC opto would do it, though I am not sure if the AC
ripple would cause the opto to give false outputs unless it ...

   I am wondering how ultrasound transducers are interfaced to electronic
circuit in a ultrasound imaging system. Where can I find more information on
this subject? Is there any off the shelf component for this task?
Any information is very appreciated.

By way of Google I found the following device which  would like to buy.
The Artech EX 220 Caller ID converter.
http://www.artech.com.tw/html/english/ex220/ex220.htm
But even searching extensivly, I have been unable to find a retailer

A brand new pic16f819 fried under my eyes : it was running on my easypic2
development board, with nothing else than leds on its outputs, when I saw
the RB6 and RB7 leds dimming and then turning off. After that, I was unable
to flash it again (RB6 and RB7 are the programming pins) ...

I have  a Digitor 20 MHz (ex Dick Smith) oscilloscope which I bought some
years ago when money was burning a hole in my pocket.  I unpacked it the
other day to familiarize myself with it.  I tested various components,
resistors, capacitors, diodes etc. and found that I got two quite ...

It was pretty easy to identify what it was that went bang,
smelled funny, blew the power fuse for half the house and
made the sewing machine stop working. I cracked the sewing
maching open and found it full of electrolytic capacitor

I need some expert advice on a power supply circuit.  Normally I would
have asked my friend who was an electronic wiz, but he's just passed
away
this year so I need a new electronic expert.  I know this is probably a

Our team provide different types of services such as
- proffessional cracking of any kind of softwar
(CAD,CAM,CAE,EDA,GIS,PCB,FEA,FEM,CNC,CFD,PDS,3D,Optics etc.) designe
for any kind of operating systems(Windows 95/98/ME/2000/XP, Linux

I have heard it before that even the digital clock on DVD players
or microwave ovens can add up to a fair bit of power. How much power
do they typically draw? Are there any plans by major manufacturers to
reduce that?

I'm trying to track down the error codes for a fisher and paykel smart
drive washing machine model lw015-k.
It is from around 1994.
I found a few posts from this newsgroup with links to the error codes