T&L Publications

If Unit A's power supply is floating (circuit ground not connected to earth), then a single diode in SERIES in A's power in is enough. Almost no current flows, so everything is protected. (Think bird sitting on power line. His feet might be at 10000 Volts; but so is his head as long as he doesn't to...

Use a loop-start trunk card instead of a line card on the PBX for the paging system. A CO trunk will also work. Lines or trunks from PBXs are 600 Ohm balanced, not 1 Volt line. (A 600 Ohm to 10KOhm transformer can fix that.) Current through an opto-coupler LED to sense selected.<p>If, on the other h...

The generator controller will control the output voltage via the current it feeds the field winding. You need to maintain constant engine RPM for about 60Hz out.<p>A cruise control isn't exactly right because they measure RPM after the tranmission, and try to keep the wheel RPM the same as when the ...

Dean,<p>That's interesting. All this time I thought the printing company didn't have the omega character in their machine.

Sounds like the 1 Ohm resistor is parallel with the load, instead of in series. THAT will eat batteries!<p>Did you measure the current yet? And, what KIND of load?

I just saw a sentence in a Mouser catalog that said a particular model of tantalum caps worked well for that kind of job. I wouldn't try it with aluminum caps.<p>[ September 24, 2003: Message edited by: Dale Y ]</p>

No NET velocity change if traveling through a vacuum. Even vapour molecules will continue at the same speed as the ice cube they came from; plus or minus the little velocity they got going to gas state. Resulting in a wet ice cube with a cloud. The cloud would get larger due to random collisions and...

If you connect inside the phone, right across the ringer, you only need the Ne lamp and a resistor. (Because the phone already the capacitor in series with the ringer.)<p>On the other hand, to connect across the line you will need a capacitor too. Otherwise, once the ringing voltage strikes the Ne l...

Jeremy,<p>Do you plan on connecting regular phone LINES to your system?<p>Also, search with the words TELEPHONE KEY SYSTEM<p>Cheers,