HDLSim
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About this app
HDLSim is a digital circuit simulator and hardware description language (HDL) for students and enthusiasts of digital electronics.
✦ DESIGN IN HDL
Write modules in a subset of Verilog, instantly check their logic, and view the automatically generated truth tables.
✦ AUTOMATIC BREADBOARD
HDLSim turns your design into a ready-to-assemble breadboard: place components, trace wires, and verify connectivity without touching a soldering iron.
✦ 3D VIEWER
Explore your circuit in three dimensions: rotate, zoom, and examine every connection before physically building it.
✦ 2D SCHEMATIC
Edit the electrical schematic with precise drawing tools and export the ready-to-document sheet for your project.
✦ GUIDED PRACTICES
Explore labs step by step: basic logic gates, multiplexers, adders, flip-flops, and more.
✦ ELECTRICAL SIMULATION
Measure voltage and current at any node in the circuit with the integrated multimeter tool.
Free Plan: HDL editor, mini breadboard, and introductory exercises.
Pro Plan: all boards, advanced exercises, and full export capabilities.
✦ DESIGN IN HDL
Write modules in a subset of Verilog, instantly check their logic, and view the automatically generated truth tables.
✦ AUTOMATIC BREADBOARD
HDLSim turns your design into a ready-to-assemble breadboard: place components, trace wires, and verify connectivity without touching a soldering iron.
✦ 3D VIEWER
Explore your circuit in three dimensions: rotate, zoom, and examine every connection before physically building it.
✦ 2D SCHEMATIC
Edit the electrical schematic with precise drawing tools and export the ready-to-document sheet for your project.
✦ GUIDED PRACTICES
Explore labs step by step: basic logic gates, multiplexers, adders, flip-flops, and more.
✦ ELECTRICAL SIMULATION
Measure voltage and current at any node in the circuit with the integrated multimeter tool.
Free Plan: HDL editor, mini breadboard, and introductory exercises.
Pro Plan: all boards, advanced exercises, and full export capabilities.
Simulate digital circuits in HDL. Protoboard, 3D viewer and guided practice.
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What’s new
- More accurate simulation, checked against ngspice: the differentiator, the 555, RC filters and rectifiers read what you would measure on the bench.
- The two-transistor multivibrator starts by itself and blinks, with or without the oscilloscope.
- The diode follows the real 1N4007 curve, and the live oscilloscope samples at 10 kS/s.
- No reading comes from a calculation that did not converge.
- The two-transistor multivibrator starts by itself and blinks, with or without the oscilloscope.
- The diode follows the real 1N4007 curve, and the live oscilloscope samples at 10 kS/s.
- No reading comes from a calculation that did not converge.
App support
About the developer
Julio Francisco Reyes Gonzalez
hdlsim24@gmail.com
CTO AZAFRAN 21 FRACC LOS MOLINOS
45200 Zapopan, Jal.
Mexico