Tag: ngspice

Side view of a 6SN7 octal twin triode with the two internal tube sections visible.

From datasheet to SPICE model: Koren fitting of the 6BX7-GT

Written by giux | Published on Sep 11, 2026 | No comments

From the 6BX7-GT datasheet to a SPICE model: Koren equations, global fitting, parameters, residuals, metrics, and model limits.

#6BX7-GT #characteristic curves #GX-TXT #Koren model #lsqnonlin #ngspice #nonlinear fitting #Octave #SPICE #triode model #vacuum tubes

Laboratory Diary – A Transistor-Based NE555 as a Test for Giux-CalcLab

Written by giux | Published on Sep 3, 2026 | No comments

A circuit inspired by the NE555, built entirely with transistors, resistors, capacitors, and diodes, becomes a test bench for the SPICE simulator I am developing on my server.

#555 timer #astable multivibrator #BJT #circuit simulation #discrete transistor circuits #electronic simulation #Giux-CalcLab #NE555 #ngspice #NPN transistor #PNP transistor #SPICE #SPICE netlist #transient analysis #waveform viewer