T&L Publications

A power line filter at the inverter output is what you need. It is difficult to find any greater than 30 amps in a stock item, but you could parallel units for more current. Digikey.com has a 30 amp filter for $35.98 or a better model for $66.00. Part numbers: 364-1030-nd and 364-1045-nd.

How is the DC produced? Is it a motor-generator (rotating machinery)?

Use #30 Krynar (wire wrap) wire to repair circuit traces that have been eaten away.

A neon lamp cannot be dimmed like an incandescent lamp because it operates like an arc discharge. It is either arcing or not. Pulse width modulation would work for both if you had a constant pulse amplitude. In other words, convert to DC then PWM. With a frequency of 30 to 50 kHz, the transformer fo...

A Google search turned up this site which has the data you need: http://www.agtannenbaum.com/l_cat.html<p>I have a Lafayette Tube tester, model EMC 215-216, circa 1975, but I doubt it is like yours.

If you will send me a diagram by email, I will post it so others can view it. There seems to be a lot in interest in this project.

Triacs are classified as "standard" or "sensitive gate". Some are designed to switch on with logic levels. You may have replaced a standard type with a sensitive gate type.

You cannot do anything with a steady 1 or 0. It has to change state or there is no information. The rising edge of the switch signal can start the 555 timer. If that does not do what you want, there is no solution to your problem.

An R-C could work but the pulse thru the R-C must occur a few microseconds (nano seconds?)before the clock and be high during the clock rising edge

What is wrong with overseas? This quote from my Google search: "I choosed the TFDS4500 IR-Transceiver from Vishay-Telefunken, because I could buy it at the german component-distributer CONRAD Elektronic (catalog-number 181331). More detailed technical information on the TFDS 4500 are availible ...

The problem may be that the magnetic circuit is not complete. A force of 10 lb. is not difficult, how much force are you looking for?

The best way is to use a switching regulator in a boost configuration. This is somewhat complex, are you prepared to make something like that? I can supply a schematic, no guarentee that it works without tweaking..

You are right, Ron, if the PLL works there will be zero frequency error in the generator output. But, I anticipated the load problem and designed a logic frequency discriminator which will hold the frequency to +- 4Hz. It is sort of a bang-bang servo.

How many do you need? An electronic salvage place will have a transformer you can take apart.

American Heritage of Invention & Technology magazine would be interesting to anyone into science and technology. It is $15 for 4 quarterly issues. Subscription address: POBox 5335, Harlan IA 51593, 800-627-4022.