Electronics Forum / Electronics / September 2004

Built another computer for a mp3 player, and it was working fine by
remote until I moved the infrared receiver (serial port model) close to
a speaker. now the program is running at up to 200% CPU usage as it's
display says anyhow. This makes the songs stutter etc. But when I

Below is the answer to an 8-year-old post about building a small
ultrasonic tank (which I am attempting to do also, BTW).
I Showed the post to a friend who has extensive experience in the
field of electronics, and he seriously questioned -- to put it mildly

For more than 20 years I'm enjoying my Sansui AU-717 very much but
suddenly there is this problem: the power/protection light blinks when I
turn
it on and i have no output. Anyone have an idea about this? Thanks for your

Thanks for reading and apologies for being so vague.
I have a phone/radio  interconnect that relies on the phone user switching
the rx and tx by using the dtmf tones on a handset (* and # from memory).
Just wondering if I can supply the tones to the interconnect as the phone

Anyone in Aus built one of these or know of a suitable schematic.
Seems like a USA Company (Boltek) have a monopoly on this, which is quite
expensive!
Jackie

I'm new here and just now I got myself confused.... and am ashamed off
it!! ;-)
When I measure the resistance of a resistor, and have my multimeter in
200k position, and the resistance measures 67    ....

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I recently ordered a new batch of PIC chips, only this time i got the
16F628A instead of the 16F628 i was using previously.
I am using a p16pro paralel port programmer, and picall for windows
(latest version), it apparently supports the 16F628A.

I was told over in the Basic Electronics forums to come over here.
We are doing some renovations at home (Sydney Australia) and as part
of this we are going to implement a Hydronically heated floor.
(basically pump hot water through a slab)

Here I sit with a jaycar stepper motor,  part number ym2751.  The jaycar
data sheet is kinda light on details.  It is getting very warm.  A few quick
questions....
1) It claims to be 12V operation with a 16 ohm coil resistance, current

I am building a video circuit to use with a z80-based project.
I am looking to use a 6845 to give a screen resolution of 512*256 with
8 colours.
I have a problem understanding the addressing of the 6845 - it seems

POWER SUPPLY
Seawater Battery
magnesium at the anode
The power for all the NEREID system is supplied by the SWB system,

 Note, in Business Week Sept 6 Pg99, of "..a ray to disable or fry
electronics in a car .. to stop it".
 Initially 2 B used in LA.

I have a device that works linked to the serial port of a PC. Throw this
serial port some commands are sent to return some information. I am trying
to do a circuit that allows me, after of send a command throw the serial
port, desconect the device from the PC maintening the suply by ...

A friend's TV has a ghost image. She lives in the New Forest and tells me
that all TVs in the area are the same because of poor reception. She has a
booster in the aerial system.
Is the ghost image due to poor reception or actually something else (which