Electronics Forum / Repair / October 2006

Should PIR sensors be placed facing away from a window to avoid fals
triggering
--
M.Joshi

I just bought a Radio Shack Micronta 22-303 logic probe, which arrived
w/o any instructions.  Although it looks pretty simple to operate, I've
never actually used this (or any other) logic probe before.  If anyone
has the users manual for this probe and would like to shoot me a copy ...

I picked up an Audio-Technica U.S. ATR45 W/T (VHF FM)  wireless mic at an
estate sale yesterday.
Any one know if it will work with my grand son's guitar. I'll have to make
up some cords (1/8 to !/4) to make the connections. RM~

Magnavox vcr model:VR9720AT01,year:July 20,1988,UL
Listed:679F=Panasonic,FCC ID Code:ACJ927064.During playback of a
recorded tape taken from same machine no audio but audio is present
from pre-recorded tapes from other machines.Anyone have any common

http://www.siliconchip.com.au/cms/A_103805/article.html
Uses DMM as readout. Ability to set a signal to 100kHz is also required to
calibrate.

I'm having difficulty in finding a voltage regulator STR57041. I can
easily find an STR58041(115V) and STR59041 (110V)  Does anyone know
what voltage the STR57041 regulates to? Know any substitues? Thanks.

I did a search for 'computer repair' and read in a news article that
seemed to say this group welcomed such inquiries.
 I have a Toshiba laptop (my third) that used to run without the
battery pack.  The computer is probably 10 years old.  I use it in my

This is a 19" Compaq monitor with a startup problem. When first turned
on, it appears completely dead. However, there is a very faint ticking
sound coming from the power supply, and after half a minute or so the
monitor just springs to life. I suspect a bad starter cap in the psu.

This is in an Amana side-by-side, FWIW.
Fills, freezes, starts a harvest cycle. Then it hangs up with all the
ice cubes stuck on top of the icemaker, and the fingers don't complete
their rotation since they're blocked by the ice. If I remove them

I would like to discuss about the problems in repairing DVDplayers,
especially Philips.
I would like to have any information regarding Philips DVD players.
Regards

I am hoping someone can be of assistance in identifying two transistors
which have died as a result of s/c in above. They are marked on board
as Q104 and Q105
Idealy a schematic of power supply would be appreciated.

I have an NEC FP912SB 19" PC monitor that I need to use in a mirrored
envrionment.  The plan was to mirror the displayed image by flipping
the horizontal yoke wires.  After taking it apart, it looks like it has
3 pairs of wires dealing with the yoke, as opposed to the 2 pairs that

Hi, I am new to this so any help would be appreciated. I have a circuit
with relay, some resistors and capacitors, diodes and a transistor. The
circuit has problem as the relay doesnt click and the dehumidifier
doesnt start. I tried the relay on this circuit on another one and the

Have a Philips 32MF605W/17 LCD TV that will turn on, the backlits light
up for a second and you can see a picture than the backlites go off.
The TV remains on and you can hear the program.
Could this be a bad inverter? If some of the CCFL lamps are bad would