T&L Publications

How are magnetic chucks constructed? Are the electromagnets energized with a.c. or d.c. current? thanks Paul

How is an a.c. relay constructed so it doesn't chatter? thanks Paul

When I went to electronet I got hit by a number of advertisements. I tried several times but could not find any thing about infrared circuits or detectors. Can anyone direct me to site to learn about the infrared detectors used on yard lights? thanks to all how responded to my initial inquiry. Paul

I recently purchased a device to notify me if someone entered our driveway. It worked for 6 days and quit. I had another brand before but it was unreliable but lasted a little longer. I want to be able to detect automobiles or ones on foot. I have hardwire capability to the driveway. Any ideas? Than...

Thanks Bodgy for your reply. Paul

In the November 2003 issue of NUTS & VOLTS under Readers Feedback a reader inquired about source code to microprocessor driven articles. What are source codes? thanks Paul

Thanks for the responses. I will take your advice and try the ideas suggested. Paul

I recently purchased a 1970 Ford truck. The ends of the cables going to the battery had been removed and replacement ends clamped on the 2/0 copper conductors. Individualwires in conductors are dull and I suspect would offer a high resistance to current flow. Is there a way of cleaning the conductor...

Thanks for the responses. I will try your suggestions, thanks again. Paul

I am looking for a book that would list current AM and FM radio stations in the USA by location and frequency. thanks Paul

Thanks to respondents and the rating of the motor is 90 volts and 15 amps. Paul

I need a schematic to make a variable power supply for a pm dc motor with 90 volt l5 amp rating. I want to vary the speed of the motor. Thanks Paul

Thanks Edd for your information and the reference. Very informative. Paul

I recently purchased a Stanley stud finder. Can someone explain how they detect a stud? Is it magnetic or like a metal detector? thanks Paul

Thanks Edd for your reply. I did not check the 9 volt batteries I took out to see if completely discharged or not. Will try that and also put a meter in the battery circuit. Before the problem I have now I don't recall changing the battery more that 2-3 times in 10-15 years! Now with the radio turne...