Transformerless Power Supply Sim produces micro-volt output SOLVED

Any ideas on why this simulation is producing only uV output when I run either DC or Time Domain on it? I even tried removing the zener, the 100uF capacitor and both regulators (leaving only a load resistor) and still near zero volts. Then I tried changing the load resistor to 10K and still near zero volts.

BTW: The original circuit used the bridge available in "Unsorted Elements", but I changed to discrete diodes in hope it would produce the expected result.

by ReverseEMF
January 01, 2013

Try running it for:

Stop time = 100ms

Time step = 100us

Note that for european mains you need to make the sine amplitude = 230*sqrt(2). Amplitiudes in CL (and in most spice simulators) are peak values not RMS.

by signality
January 01, 2013

Just started using this. But, if using AC source you need to either run square or change phase to 90 or 270 for p/-p. at least when DC sim used

by gotwood
February 03, 2013

Actually, signallity's suggestions solved the problem(s) -- thanks.

by ReverseEMF
February 03, 2013

Post a Reply

Please sign in or create an account to comment.

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.