HP 3582A Spectrum Analyzer (1 Hz to 25 kHz) Repair Attempt, but for the Worse. Part 1.

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I attempt to repair my HP 3582A Spectrum Analyzer. This Hewlett Packard instrument dates back to around 1978 and early 80’s, about as old as I am myself. Without any prior warning, one day the instrument started showing a skewed image on the CRT display, but the instrument remained fully functioning from inputs to measurements.

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Teardown of a 4 kW O.J. Electronics Variable Frequency Drive

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Teardown of an O.J. Electronics 4 kW Variable Frequency Drive. A special frequency inverter drive build to sit directly on the back of the asynchronous motor. Power electronics and control is based on Infineon silicon parts with a Freescale MCU+DSP IC full of features directly designed for motor drives. For more teardown videos, articles or

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First Sparks On The 10 Minute Design DRSSTC: Safety, Setup and MIDI Music!

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First sparks, lightning bolts and MIDI music played on the Tesla coils. Both the FGL40N120AN TO-247 and 2MBIN50-120 brick IGBT based inverters perform well with around 60-70 cm long sparks! There is still issues like racing sparks, fine tuning of OCD setting and removing sharp points around the primary coil, strike rail and protective shielding,

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Rebuilding the 10 Minute Design DRSSTC: No More TO-247 IGBTs

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In this video I rebuild one of the Tesla coils with IGBT bricks instead of TO-247 devices. I am done with small transistors that can not outlive my abuse. With the new 2MBI50N-120 based inverter we can once again do the static load test and adjust phase lead compensation on the Tesla coil. This is

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Rebuilding the 10 Minute Design DRSSTC, Static Test and Phase Lead Adjustment

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In this video I identify the root cause of the IGBT failures, to a wrong gate driver IC. With the correct gate driver IC, full-bridges repaired with tested IGBTs, we can finally finish the static load test and adjust phase lead compensation on the Tesla coil. This is the 5th article / video in the

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Exploding the 10m Design DRSSTC: Softstart, Secondary Coil Terminations and Total Annihilation

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This article and video focuses on full mains power startup, secondary coil terminations and connections, adding a new soft start module to the mains input for dealing with high inrush current and blowing the full bridge of IGBTs up completely. This is the 5th article / video in the series of designing and building a

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Testing the 10 Minute DRSSTC Part 1: UD2.9 Driver and DC Bus Capacitors

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This article and video focusses on configuring and validating the Universal Driver (UD2.9) functions and reforming the DC bus capacitors. Starting up a new electronics circuit can be done with various degrees of precaution. The easy way would be to apply full voltage and all inputs / outputs connected and see that the circuit behaves

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Building the 10 Minute DRSSTC Part 2: Construction and Assembly

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In this video we put together the components, found in part 1, that is needed to build the DRSSTC design that was done in 10’ish minutes. This video focusses on how good looking construction can be done with simple tools. No 3D printer or expensive tools are needed. Imagination and craftmanship is enough to get

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