Electronics Forum / Repair / July 2008

I am looking for a 50L6  tube for a radio, if someone has one and how much.
                            Thank you
                                    Vince

I am going nuts.
We are using a 2.4GHz wireless video broadcaster in our home (Germany,
240V, 50Hz, PAL TV 25fps). It is based in the lower level and
transmits a satellite receiver output to the upper level TV room,

Which can be trusted, and which should I avoid?
I recently bought one of Staples' own brand for 19.99, and it was dead
out of the box.
-ChrisCoaster

Hi all, hope someone can help.
My next door neighbour, who is 98 years old, is rather deaf, and we
would like to get her a pair of TV headphones to make everyone's life
a little easier - her's esspecially!

I picked up an old Timex Sinclair 1000 computer from a thrift store
recently. It came with a 16K RAM pack, but no power supply. The power
jack looks like a 1/8" earphone jack and is marked "9V" -- but no
polarity is indicated. I don't want to fry this thing, anyone know

I believe I have an Acer laptop with a bad DC power receptacle. The
power adapter is providing the proper voltage(19Vdc); however, when I
connect to the laptop circuit board (which I have removed from the
laptop), the solder points of the receptacle to the circuit board show

I need to build a surge suppressor to go on the input of an alarm
circuit. The circuit operates at 24.0 VDC. This is a two wire input
with an end of line resistor. I pulled an AC line toroid off an old
RCA TV and plan to connect it in series with my alarm circuit. Across

AND I WANT KADAITCHA MAN TO COME OVER HERE AND TAKE A sh.t ON MY FACE.

I recently had the opportunity to install computer systems in a private
school, and the only available time was during classes.  As I went about my
business during a 4th grade science class the teacher was asking the
students what they had planned for their science fair projects. ...

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Text reads:
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Please have a look at the circuit at:
http://www.glacialwanderer.com/_blog/blog2008/04_April/hb_relay5.jpg.
It is from the article at http://www.glacialwanderer.com/hobbyrobotics/?p=9.
The circuit it to turn on or off a AC bulb by a microcontroller. My

Hi, I've been looking at some new low-cost handheld scopes, but would like
to know of some models (under $1000US) that various users would recommend
for various reasons, not just low cost.
I'm in the US, and I don't need a rugged model for everyday service/repair

Anyone got the schematics for a Peavey "Series 402" power amp section. The
actual board is marked "402 Module" and has the power amp and power supply
regulators on it. The whole amp is a head that's made in two bits :-  a
front panel unit that's the preamps etc, and a completely ...

Expensive control amp/ preamp
Scratchy motorised/sevo volume control. Anyone been here before, any pifalls
opening up etc ?
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