Repair

Which chip is this? 274 E16 L309
Hi, all. In a recently acquired pile of vintage junk (well not all junk, some good pieces!) I found a stick of 12 vintage IC's. They are all 14 pin DIP's marked "274 E16 L309". Does anyone know what these are? A google search came up with nothing relevant. Thanks for all replies, Cheers, Roger PS. addres... 9 Mar 2010 07:50

Horizontal Deflection
Doe anyone have a copy of the Horizontal Deflection article by David Sharples in "Electronics World", June 1996?. Thanks ... 8 Mar 2010 11:56

Chemical test for SnPb lead/ RoHS lead-free solder
A chemist gave me enough potassium chromate to have a go. Ground off a few mg from some sheet lead , dropped into some chromate solution and a cloudy yellowish deposit formed in the otherwise orange liquid - what it is supposed to do apparently. Then ground off some known lead free solder , added to some of the sol... 10 Mar 2010 16:27

Yamaha EMX640 mixer amp
As far as I can tell this is the basic form to the power amp - what class is it? and in general terms the operational bounds of the biasing, a lot of diodes? seem to be involved. Equi-spaced font needed for this ASCII, maybe properties/mesage details or copied into text handler with "Terminal ","Fixedsys" font or s... 8 Mar 2010 10:49

Death & Destruction of a Fluke Multimeter
The title says it all really. See what happens when I try to destroy Fluke's new 28-II Multimeter: http://www.youtube.com/watch?v=qlA7-fh5nDQ Dave. -- --------------------------------------------- Check out my Electronics Engineering Video Blog & Podcast: http://www.eevblog.com ... 10 Mar 2010 07:29

TV wont turn on
It got a portable TV with DVD that wont turn on. When the power button is pressed it goes into standby which is normal but when I try to switch on the TV from standby it sounds like the capacitors are charging up but there is a fault at the same time the standby lights begins to fade in and out. Im not really an e... 7 Mar 2010 12:57

long wire antenna
A customer lives in an apartment house on the 17th floor. He wants to use an old Hallicrafters AM and SW radio. He cannot put up a long wire antenna in the conventional way, however he wants to "weave" a sort of antenna outside on his terrace, sort of like a web, with insulators to hold the wire in every bend off g... 22 Mar 2010 01:28

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Insignia NS-HDTUNE Take Apart/Exploration
Well, I was bored and curious...so if you've been wondering what's inside this (or probably almost any other) HD Radio tuner, here it is: (warning: the following link contains large quantities of pictures and is therefore not friendly to those who have bandwidth caps or are charged on a "quantity of data trans... 11 Mar 2010 12:19

Air Compressor Problem - Motor Stalls
I'm having a problem with my 20 gallon, single stage electric air compressor. It's acting like the motor is underpowered - it pumps up to about 95 psi ok, but then the motor stalls. The unloader bleeds the pressure off, the motor restarts, runs for a couple of seconds, and then stops again...repeat...repeat... ... 20 Mar 2010 09:47