Electronics Forum / Electronics / April 2004

Sorry if this is an inappropriate group, but please let me know if
there is a better one for my question.
Sometimes my baby monitor receiver emits a whining noise which I have
sampled and found to be very sharply peaked somewhere between 4450 and

I was given a DC to DC converter a couple of years ago and finnaly got
around to trying to do something with it.When I traced out the circuit I
found that the devices driving the transformer were BIG SCRs. I had never
seen this before. I am familiaar with transistors FETS IGBTs but ...

is there any who havw circutshematic of marshal amplifire
thanx

I have an 8051 embedded development system and HiTec C complier.
I paid about $2500 8 or 9 years ago.
Any idea where I could sell it and what it might be worth?
Cheers,

I need to build some hardware that will be connected to a regular
phone line and to the input and output of my sound card.
I want to be able to send sound from my computer to the phone line,
and from the phone line to my computer.

Would anybody point an ADC board with the following (or similar) specs?
Input Channels         : 1 (or 2 with simultaneous sample&hold)
Conversion Speed    : 10 MHz
Resolutions               : 12-16 bits

OK, I have finally found a USB-232 converter which doesn't crash my
PC. Whilst being a fairly good device, I still have found a few
problems which others may have experienced.
The main problem is that I am dealing with serial devices that

Just downloaded a couple of modern PC DJ applications. Not bad. All
you have to do is select the tracks and voila, auto cueing and mixing.
I like it. Much easier than pushing the needle over the vinyl like I
used to do!! No real challange however.

Hi, I have a few stepper, dc and servo motors that I obtained for cnc /
robotics, I have small to large types for sale.
Howard.

heya ppl! :)
ne one out there know how to amplyfy the current comming outta the
opamp?
the opamp is hooked up to a 8 bit DAC (DAC0832 ) if i could post a

Hi, Many years ago I was involved in TV repair and remember using a
method of 'Ring' testing a flyback using nothing more than a cap and a
scope. It was from a UK Practical Electronics article and it worked
very reliably to find shorted turns. I seem to remember it using the

I have a HP 8559A spectrum analyzer and 182T display/mainframe that I'm
thinking about selling rather than simply storing it indefinitely.  Do any
of you have suggestions for how to go about selling such a specialized piece
of equipment.  I have contacted a few test equipment ...

I am considering PC-104s for my project.  I can increase space/power
however, to obtain higher processing speed with larger form factor boards.
EBX sounds good, but I heard that it is not as rugged as PC-104.  My
application will be in rough conditions subject to G-forces.

www.arx.com seems to be a dead duck
Lookig for a power tranny for a SS600VC Aussie pizza oven
aka power amp
(Yes i do know about rewinders, but my favourite rewinder

Hi group,
Anyone here have any ideas what chip Prof. Stephen Hawking's voice
synthesizer uses? I see that he may need a replacement shortly if it
ever goes wrong, as the chip is no longer manufactured this could be