Category Archives: Mr Carlson’s Lab

CNC Power Supply Repair, Yamabishi SF-PW

Troubleshooting and repair of a CNC industrial switch mode power supply. The Mitsubishi SF-PW and Yamabishi SF-PW are almost identical, see what fails, and follow along as Paul repairs the problems one by one. These power supplies are out of an AC spindle drive known as the FREQROL-SF. Click the Continue reading CNC Power Supply Repair, Yamabishi SF-PW

Troubleshoot Electronics FAST with a Super Probe

Build a “Carlson Super Probe” and make your electronic troubleshooting easier. Locate noisy parts fast! This is a “non-contact” style probe that listens to your circuits from a distance. Great for Audio and RF applications alike. Schematics and full description are in the video. In the end, Paul will demonstrate Continue reading Troubleshoot Electronics FAST with a Super Probe

Design and Build a Buffer Circuit, Tube and Transistor

How to design, build and install a buffer circuit into a receiver, so you can give it a digital display. Learn how to locate the oscillator circuit in a receiver without a schematic, using a new, and older vacuum tube oscilloscope. Lot’s of other “bonus” repair information as well. See Continue reading Design and Build a Buffer Circuit, Tube and Transistor

Nixie Tube Digital Display for Receivers

Watch the build process of a Nixie Tube digital display for older receivers. See the design of a scratch built circuit board, and the thought process involved in component placement and population. This is the final part of this Nixie tube series. For the earlier parts of the series, click Continue reading Nixie Tube Digital Display for Receivers

NIXIE Tube Programmable Frequency Display

How to build a programmable frequency counter for your favorite receiver, with “off the shelf parts!” Give that old radio receiver a digital NIXIE tube display. No special programming required. Join Paul in the Lab as he thoroughly explains how this, and many other frequency counters work.

Part 1 of Continue reading NIXIE Tube Programmable Frequency Display