T&L Publications

what is connected to the pins (on the inside) of a microchip? Is it "and" gates and "or" gates? If it is, how do I know which chip to buy to fit my project? I have some high signals (24vdc) and some low signals (0vdc). And in the end this chip would have to energize a 24volt dc i...

my computer has two users. I cannot log on unless the other person is logged off, and I cannot just " switch users" . Only one person can be logged on at once. How do I fix this??

Even though I run "CC CLEANER" and other clearing software, can I still find where and when I was on the computer? Using WINDOWS XP how can I se the history even after it is cleaned?

I have a 32 inch RCA television (@ 8yrs old). after watching it for a while the sound will go off. The only way to restore the sound is to turn off the power to the set and wait @15 mins. When the sound goes off, I can still push the volume button and see the graph moving up on the screen, but it on...

I have an "APC Smart UPS 700" back up power supply in excellent condition @ 3 years old. What is it worth?? $100.00??? Brand new it list for at least $500.00 .

I have a dell laptop running "XP". There are 2 people logged onto this computer but only one person can be on the internet at one time. If the other person wants to log on and go on the internet they first have to log off the other person first. Is this normal or can I fix this?

I have a floor sanding machine. (115 volts, 1 hp mtor) It trips it's own circuit breaker(40amp) everytime you push the start button. I was able to test 2 internal windings (start and run) with an ohmeter and found one to be open.(a definite problem) but maybe not the whole problem. It also has a sta...

Does anyone know where I can obtain a coppy of RSLOGIX 500 software.That doesn't cost a fortune? I want to be able to plug my laptop into the equipment at work and practice/learn about diagnosing machines that use this software.

Does anyone know of a good article/tutorial on the proper way to hook up a high voltage (480v) three phase 40hp electric motor. The motor is used to turn a hydraulic pump for an elevator. There are 12 leads. And it is used in a WYE/DELTA start/run configuration. It has a WYE contactor and a DELTA co...

Is a" TRIAC" used to pass AC voltage and current only, or can it be used in DC applications also? Would it be used for the purpose of completing a DC relay coil circuit, or only the coil of an AC relay?

If current flow is from negative to positive and not the other way around. I was wondering about a car battery. Do the electrons flow from the negative plates inside the batterry over to the positive plates inside the battery and then exit the battery throuhg the positive terminal then through the c...

I have a sensor that sends a signal when it passes close to a magnet. The sensor is plastic and has two wires. It looks like a 1/4 inch bolt with the wires sticking out one end and is screwed in so the distance to the magnet can be adjusted. The magnets are stationery and the sensor moves. With an o...

I always thought the purpose of a diode connected across the coil terminals of a relay was to protect some delicate electronic circuitry somewhere down the line from a voltage spike during the high voltage collapse of the coils magnetic field. But if there no delicate electronic circuitry(only other...

I have a simple series circuit that consists of, a spring loaded push button, a 150ohm resistor and a relay coil. and the connecting wires. ( the relay is rated at 48 volts). The supply voltage is 54volts DC from a transformer and rectifier. The relay does not pull-in. The voltage measured at the in...

on a large capacitor like the ones used in central air conditoners. Some have 3 or 4 connectors on top. I learned there was only 2 sheets of metal foils seperated by an insulator wrapped inside a capacitor. If this is true, what are the extra terminals connected to? Is there more than one connector ...