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google modem.

Its not the softwares job to do the designing, not yet anyway.

Not so dense these days now we have the microcontroller. One to hand has 80pin flat, 28 pin soic, 32 pin dip, 2 off 20pin dips, 2 40pin headers plus descretes. 2 layer, 3"x 2".

I use a router by Bartell, a german company, It's at least 10 years old. Ive never failed to get 100% routing success. Vutrax, an americasn company, used to use it on their systems but they make their own now. Both systems are highly recomended.

You need an inductor in series with the armature.

You might consider PT100 probes instead. Much easier to get accurate and not expensive.

The HEF4060 will go down to at least 30hz, at 14 bits that just about gets you there.

I think a 2 input AND gate solves this problem. PWM to one input, on/off to the other, output to the panel. You can either use a gate per panel or use the AND function in your software.

her's another way, http://www.irf.com/technical-info/designnote/dn503.pdf

The kw rating seems too high, also a cold element draws alot more than its rated current. Another possibility is your temp controller is cycling too fast.

Patent protection is relatively cheap compared to marketing, manafacturing, R&D, approvals ect. Of course it's not perfect but what is.

First you need to ask is your pcb worth reverse engineering, if not (most likely) then why bother, if it is (very unlikely) patent it.

I guess you need to read more carefully as well scotty :).

You should read my post more carefully, you put the current transformer on the MAINS lead. The lead that plugs in the wall.

A current transformer, rectifier, sensitive relay, might work. Put it on the mains input live wire, you may need a few turns through the core.

For a tiny inverter like that its not worth trying. Breaking/making the output connections to a running inverter is not recomended.

I'd be very wary about fitting fuses between the busses, if they open under heavy current flow, and thats when they will open, your buss voltage could go through the roof allmost instantly.

hi aolalde, the problem with your suggestion is you can't start the system easily and if the vfd is running at a lower spedd than the mains the power flows the other way and has nowhere to go so you get a bus overvolt trip.

Dont forget that unless you have an active front end on the "dyno" vfd you need to connect the dc busses together so the regenerated power has somewhere to go.

110vac is a very common control voltage on european and american machinery of a certain age, allmost universal before the advent of the PLC.