Making a Full Wave Rectified Signal in Ltspice.

Just ground one leg of the "Independent V source' through a very, very large resistance. The simulator is looking for a path to ground so that it can "anchor" its calculations.

V*sgn(V)

See p43 of the LTspice manual. ...Jim Thompson

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Ah, don't feel bad. Last night I was dabbling around with some diode strings in a circuit and I decided to do a jumper around them instead of editing them out of the circuit. The jumper works fine how ever, when you click on the diode string inside the jumper string, you get a nice graph of loaded noise!.

I guess some one could of thought the jumper wire may act as a antenna and the diodes were acting like detectors. That is the only thing I can come up with why LtSPice would even bother processing them.

Jamie

Version 4 SHEET 1 880 680 WIRE 160 96 -16 96 WIRE -16 128 -16 96 WIRE -16 224 -16 208 FLAG -16 224 0 SYMBOL bv -16 112 R0 SYMATTR InstName B1 SYMATTR Value V=170*abs(sin (377*time)) TEXT -50 248 Left 2 !.tran 0 .1 0 10u

My favorite is leaving voltage sources loaded with nothing. Just grounded. Often I have many unused voltage sources on the schematic as if I had many power supplies adjusted on the bench and connected to whichever needed. 'What was that last voltage I tried?'

Ah.. Using the arbitrary behavioral voltage source.

I would have tried degrees first.

But function is set for radians.

Maybe it's cause it's late but I'm trying to make sense of that.

Will look into that. Thks.

mains.

Perhaps it was my interpretation of the problem you were experiencing that is at fault, and not your ability to comprehend my reply :-)

When I read your post I thought the issue was with the simulator software not liking a transformer primary circuit 'floating' without a path to ground (Typically one would like to make the gound node coincide with the negative DC output lead).

But now I see that really you just want to have a voltage source that produces a full-wave rectified waveform.