Repair

Balun for DB4
I want to install a DB4 antenna on my chimney in an attempt to dump my cable provider (I don't watch too much anyway). But I am concerned about the durability of baluns in the weather. They seem pretty delicate and chitzy, and I wonder if it would be something I'd have to replace every couple of years. Doe... 8 May 2010 07:56

Equivalent for BUY69B transistor?
I'm trying to repair an ultrasonic cleaning tank and one of the power transistors has gone. It's a BUY69B, now long obsolete. Can anyone recommend an equivalent? I'm assuming it's a high voltage, high frequency device??? Thanks ... 9 May 2010 15:25

Too little time to shop for unlocked cell phones
CDMA and GSM Cell phones have become big business, and the larger demand has produced a greater choice in phones today. While this is good news to the discerning consumer who has an inkling of the features he is looking for, it can be overwhelming to those who aren't sure where to begin. For those who are feeling l... 8 May 2010 06:51

making a Bridge Rectifier from Diodes ?
I need to have a Bridge Rectifier 250V 40a ..... unfortunately there is no such thing available as far as Google can see Can anyone tell me what size Diodes that would work ? I am just a hobbyiost and anything for instructions that I have found, look like they need a College COurse to navigate. Any suggestio... 7 May 2010 18:58

NOISY Whirlpool Dehumidifier
Hi, I bought a Whirlpool model AD50DSS2 dehumidifier. It is a very NOISY (vibration noise) dehumidifier! A service man came. He thought he fixed it, but later the NOISE was back. The dehumidifier's cabinet "amplifies" the compressor's vibration. A call to Whirlpool was no help at all. ... 12 May 2010 13:37

Overlay designations & miscellanea
I thought I'd messed up the USB lead of my HP 1020 laserjet , measuring voltages etc, trying to learn about USB function. Turned out I must have strained a USB A to B adaptor and nothing wrong with the printer. Is one rule of thumb (for a suspect USB connection) that a maximum USB insertion force of 250 gram is to... 8 May 2010 05:47

Signal conflict?
What should I do about signal conflict (overload?) between two sources, both on co-axial cable? Is there an easy way to weaken a tv signal in a co-axial cable? I have two inputs to my maybe 10-year old analog tv, selected with an A-B switch, with co-ax input and output. One input A is from the 2-year-old DVDR... 17 May 2010 16:54

Krohn-Hite 4100A
Hi, Any one out there got a service manual or at least a schematic for the Krohn-Hite 4100A push button oscillator? Remove "_spamNo" if you want to contact me off group TIA JC ... 10 May 2010 19:56

Color changing LEDs
I keep seeing these little solar power sidewalk lights. Last year they were all white (blueish white). Lately I see them where they change color. Yet, they only have one LED. How can a LED change color? I thought the color was determined by dopeing it with a metal. So how can they change? This has me puzzled.... 8 May 2010 23:15

Task Light just Flickers
I have a Luxo asymmetrical task light which takes an 18 watt bulb, which is starting to give me trouble. Most of the time it will just flicker as if it is trying to come on, but sometimes it will flicker once or twice and then come right on. When it does come on it shines bright. Luxo will not support this task... 9 May 2010 20:54