T&L Publications

Thanks friends for the info, Sorry for the long delay getting back, I posted the question then remembered I would be away on holiday for 5 days. A question comes to mind regarding the zener. It failed due to heat, did it just fail or did something take it out? With a treadmill there will be some pow...

I have often seen used treadmills at the curb as people get rid of them, for whatever reason, they decided to buy a real cloths rack. I can think of a myriad of useful applications for the DC motor & drives, one being a variable speed potters wheel. I have picked up a nice heavy duty treadmill w...

Thank-X for your time. It all makes sense, I'll look forward to trying the circuit.

I’m just beginning to delve into this field of electronics with an electricians background, so at this point I’m only following the article details with only some idea of the components effect on the circuit. I having gotten most of the components easily, I am wondering about the MAX639 regulator. I...

Has any one got a source for the MAX 639? A quantity of two would be good, I have found a
source for minimum of 100. But I’m not building that many lights.

Contributors, Thanks for your input. Your ideas gave me some good leads to follow. I checked out a site on the many uses of the 555IC and looks like the way to go utilizing the one shot application. It may be a few weeks until I get back to the project. Time to get the garden in. Thanks again. John

I believe that the signal identification is indeed one of the problems. At the docking station I have identified the voltage to be at 5 volts then being pulled low momentarily . Up to this point I was unsure how to look at it other than with a VOM. The scope will solve that. On the docking station I...

Let me see if I can make it a little clearer. <p>I have a device that is used to produce a picture. There are 2 parts to it. The main body of the device called the docking station, and the optic head of the camera called the wand. The wand is attached to the docking station by way of a cord. This wa...

The interface I am working with is strictly the control signal, nothing to do with the video signal. The interface is opto-isolated between the camera and printer, both systems are running at 5 volts. The printer will take the command to capture the image when pin 2 is brought low by physically shor...

I have a project to interface a dental camera system to a printer. The control circuitry on each machine uses TTL logic. I built an optical interface but the signals are different. The basic method of operation is to send an external signal to the printer (Mitsubishi CP910u) through pin 2 from hi to...