T&L Publications

I'm using a microprocessor to control the brightness of a lamp by detecting the "zero" voltage point on the A.C., then delaying a pulse to a solid state relay. Everything works fine................. (famous last words)..............until..........Murphy's law kicks in. I've figured out the...

Bigglez.......... I have clearly described the circuit in my first post. You asked for a circuit diagram. I stated I would not post a circuit diagram as I have clearly described the circuit. You asked for a circuit diagram. I stated you keep asking for information that has been provided. You asked f...

Bigglez and philba, you guys are really cracking me up. I don't know how many times I have to state something, or how clearly I have to state it, but you both keep asking questions that have been clearly answered or described already. MrAl, Regarding the "crosstalk".......... When I use a ...

dyarker, it's just a 10ft cable. I extended it to 100' for experimentation and to exaggerate the problem. I'm using LTC1481 drivers. they are $2.00 each but they have high ESD protection. My problem with going to a full 2 pair transmission is having to add more cable, more connectors and more space ...

ANOTHER REVISIT................ I am still using a 10K resistor at the reciever input end to "dampen" spikes into the 74HC164 clock and data inputs. After assembling a few units using the RS485 driver chips at the "master" end I STILL had data problems with some units. After asse...

****REVISIT**** I still had major problems with the transmission................ Even on short cables using a 2n3904 transistor I got spurious resuts, again, only on the second 74HC164. I extended the cable to 100' and had MAJOR problems on both 164's so it does seem to be interference on the cable....

I think controllers have their own diodes so I doubt you'll have to worry about that. I fact, I don't think there's a real problem here at all. If you overloaded the battery maybe you'd have a problem, but I don't see the difference between connecting two solar controllers that add up to 1500W or on...

The problem is not "crosstalk", nor "data setup time", nor "clock rate". This problem is getting interesting, in that, even the simplest circuits that SHOULD work, may not for some strange reason. I guess this is why following rules of good design is importatnt. To elim...

I lowered the clock frequency and that didn't help. I did try a bypass
cap but I used a 100uF electrolytic. I'm going to put a scope on it
and see if there's something obvious.

I have this circuit that is giving me problems, before I spend hours trying to find the problem anyone care to hazard a guess or point me in the right direction? I'm sending data to two 74HC164 serial in, parallel out shift registers over a 10 foot cable from a PIC microcontroller. It's a 4 wire cab...

I too placed an order with them but only because they had an inexpensive
part I needed and nobody else had it.

I generally avoid dealing with ANY company that does not have an
address or telephone number. What else would you expect from
an organization like that?

You know, I'm amazed by this. I've been working on electronic long enough to know you can never be sure of ANYTHING. But I was ABSOLUTELY SURE you couldn't dim a switching power supply, but because of my experience in NEVER being sure of anything when it comes to electronics I threw it out here for ...

O.K. I know you're laughing. Now stop and think about it. Specifically I was asked by a customer that has a dimming control if they could use it to control a LED lamp. The LED lamp has a switching power supply. Are they completely incompatable? Or is it even possible the dimmer will shut off the swi...

It's for a lighting control based on a number of parameters such as occupancy, time periods, temperature, brightness, settings, etc. It is expected there will be a production run and properly certified. If we make 1,000 it's better to have 1 transformer that has a dual primary for 115, 240, and drop...

Thanks for the lovely replies, anybody care to answer the origional question?