T&L Publications

I thought the Dot Com model of making money by giving away your product was prooved wrong years ago.<p>This guy should be arrested for violating the laws of thermodynamics. It's not quite a perpetual motion machine, more like cold fusion. Put a small voltage in and get big power out, that was the ba...

Given your restrictions, a regular Air conditioner is probably not the best choice. I say this in part due to the incompatible power considerations and partly due to the difficulty venting the hot side of the A/C.<p>A swamp (evaporative)cooler is probably the best way to cool yourself off. www.swamp...

Melting ice, Spring loaded trigger arms. I think you might be a fan of Rube Goldberg machines also (A.K.A Kinetic Art). A design worthy of Wyle Coyote (of Road Runner fame)<p>The coil spring winder is not that original. It was a feature on some old instamatic (110 or 126 cartrage film) cameras.<p>Ic...

If you look closely at the spec sheet for a relay, you might find a spec for Minimum Switching Capacity, which in the case of the one I am looking at is 100uA, 100mV.<p>Surely a closed relay can have smaller currents through and smaller voltage across it (I do this all the time). So I am having trou...

You may be able to sell at least some of those on eBay. Particularly the Scope manuals. I see manuals for this type of thing on there all the time. Can't speak for how well they sell though. And, you WILL have an answer in 7 days flat.

As I understand it, a Deisel-Electric Locomotive has current to burn. I have no idea what voltage the motors that turn the wheels run at ( a good guess is 74V) but the current must be in the hundreds of amps to get the kind of traction those things put out.<p>Though terribly inefficient (for cooling...

A single shot using the RC servo seems like the easiest first try. Put an eccentric cam on the servo shaft such that when it rotates, the wide part of the cam presses on the shutter button.<p>Winding will me more difficult since the torque on the winding knob can be pretty high, I doubt an RC servo ...

"I've been given to understand that generally a cap is a cap is a cap."<p>Only on paper. The "memory caps" recommended only have a voltage rating of about 5V or less. Put that in your car at 12V and you get smoke. The big caps used for cars are very expensive. I'm sure he dosen't...

Most high power audio amps schematics I have seen (any worth building that is) are based on FETs anyway. The BJT transistors you have would be better placed in a linear power supply or something similarly DC.<p>Timothy, that happens to me sometimes. It's the punctuation A colon followed by a "D...

You can probably bias the coil on that automotive relay either way and it will pull in the arm and make the switch. A doide is certainly not needed to protect the relay, the switch or most automotive power systems. I would encourage a fuse on the coil loop and the load loop (switch contact side) sep...

Maybe, I haven't read the datasheet enough. It does seem to have a way to attach a keypad for dialing and does store numbers gotten from CID but I am not sure if you can store your own numbers or how you would trigger the circuit to take the phone off hook and start dialing to say nothing about dial...

You cannot boost the voltage of DC without first going to AC as is done in the a DC-DC converter. I wouldn't exactly call it Linear since it has more in common with a switcher but it will do the job and is standard fare in most high powered audio amps as with a 4ohm speaker and 12V you could only ge...

Chips like this HT95168 are fully integrated and include the LCD driver on-chip. All you need to do is select an appropriate LCD display and your practically done. You can find all sorts of LCD displays and you may be able to adapt an LED display if you build a buffer to boost the drive current.<p>I...

Other than knowing it was packaged in Mexico on the 31st week of 1986 by motorola the part number is not one of their standard lines. It may be a house number and you would need to go to the equipment manufacturer to cross it with their schematic (good luck). I checked several databooks and could no...

I have actually had corroded back up batteries reduce the useful life of some products. If you rarely have a power failure it is easy to forget that the battery in the clock may be several years old.<p>As a manufacturer, it may be better to force your customers to reset the clock than it is to get c...