Tag: GX-TXT

Cover image for an article about the Koren model for triodes, showing a vacuum tube, the model equation, and a family of anode characteristic curves.

The Koren triode model: theory, parameters and limitations

Written by giux | Published on Sep 12, 2026 | No comments

A study of the Koren triode model: equations, parameter meaning, limitations, 6BX7-GT fitting and independent LTspice validation.

#6BX7-GT #characteristic curves #GX-TXT #Koren model #LTspice #nonlinear fitting #Norman Koren #SPICE #triodes #vacuum tubes

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

Famiglia di curve del tempo di accensione del LED in funzione della corrente I_SENSE per cinque regolazioni di P_SENS, con P_GAIN mantenuto a circa 500 ohm.

GX-TXT-v3: HOLD Node Dynamics and LED On-Time

Written by giux | Published on Aug 23, 2026 | No comments

GX-TXT-v3 HOLD-node dynamics: burst charging, exponential discharge, LED on-time and sensitivity characterization with GNU Octave.

#2N3904 #analog electronics #BAT54 #capacitor discharge #circuit analysis #circuit measurement #experimental electronics #GX-TXT #GX-TXT V3 #HOLD circuit #HOLD node #infrared remote control #IR receiver #IR Remote Control Tester #LED on time #LTspice #PCB testing #RC time constant #SPICE simulation #transistor circuit

PCB GX-TXT-v3 del ProvaTelecomando IR assemblato e pronto per la caratterizzazione

GX-TXT-v3: IR Remote Control Tester – Circuit Schematic and Assembly

Written by giux | Published on Aug 18, 2026 | No comments

GX-TXT-v3 is a compact IR remote control tester with adjustable gain and sensitivity, 20-second auto-off, PCB layout, and assembly details.

#2N3904 #analog electronics #BAT54 #circuit schematic #circuit testing #Darlington transistor #DIY electronics #electronics project #GX-TXT #GX-TXT V3 #HOLD circuit #infrared detector #infrared remote control #IR receiver #IR Remote Control Tester #IR tester #LTspice #NE555 #PCB assembly #PCB design #remote control testing #sensitivity control #transistor amplifier

PCB del progetto ProvaTelecomando IR appena ricevuto, ancora nella confezione, affiancato dallo stencil metallico per la deposizione della pasta saldante.

GX-TXT IR Remote Tester – The New PCB Has Arrived

Written by giux | Published on Aug 17, 2026 | No comments

The new version of the IR Remote Tester PCB has arrived, along with the solder paste stencil…

#BJT circuit #electronics project #GX-TXT #hardware development #infrared remote control #IR Remote Tester #PCB #PCB prototype #photodiode #solder paste stencil