Barbouri's Electronics Projects
Restoring vintage electronics along with designing and building new circuits. One eye looking into the past, the other looking into the future.
I have had my used Keithley 2015 THD multimeter for just over six years now, and have finally decided to perform some maintenance on it. I purchased it as a fully tested and working unit back in 2016. After it arrived, I did a visual check of internal components and a good cleaning of the exterior.
I have had my Nakamichi 420 audio amplifier since the late 70’s, and have used it with no issues since it’s purchase. Recently I was listening to an album, when it quit producing any sound, and shortly after produced that burnt electronics smell we know so well.
After the acquisition of my Power Designs 5015D power supply, I really wanted to upgrade the display module so that I had an extra digit of resolution. I already had a few ADC/LED meter boards left over from previous projects, but needed a display board to pair with it.
Repair and cleanup of a Power Designs Inc. 5015D power supply that I purchased on Ebay.
This was one of the better looking 5015D power supplies that I have seen on Ebay, that was not overpriced or included an overpriced shipping charge. The listings condition description said ” fully operational and functions as intended”.
Cleanup and mechanical repairs on a 1996 vintage HP 1662C Logic Analyzer to add to my test equipment collection.
Adding a new HP 34700 series module to the collection. This time it is the 34721B BCD interface plug-between module, which converts character serial data from the 34740A or 34750A Display Module to parallel character information for output to a printer.
Repairing some Davis Vantage Pro2 ISS transmitter boards that have stopped transmitting at night.
Checking out a HP 3551A sold as “For parts or not working, will not power on”, that I actually purchased for parts.
My original intent on purchasing this unit was to salvage the knobs and connectors for repairing some of my other HP gear. I did manage to swap out four of the knobs before my curiosity got the better of me.
Cleanup and repair of a Hewlett Packard (HP) 8012B pulse generator purchased on Ebay as “Untested does not power on, sold as is”.
The 8012B was originally produced by the HP Gmbh Boeblingen Divison, Germany, but this later model was made in USA. It provides variable transition times down to 5 ns and the repetition rate can be adjusted from 1 Hz to 50 MHz.
After spending many hours working on my Hewlett Packard 5300 series measuring systems, I decided to remake my own version of the HP 10548A diagnostic service kit.
Cleaning up and photographing a Hewlett Packard 5301A 10 MHz counter plug-on module for the 5300 series modular measuring system.
Cleaning up and looking at a bunch of plug-on modules for my Hewlett Packard 5300B mainframe modules, after purchasing a new unit. It seems that I am starting to collect quite the range of modules for my HP 5300 systems since my original 5300B Measuring System back in 2017.
After using my last commercially made isolated TTL serial to USB converter for my last project, with no hopes of it being re-stocked in the near future. I decided to try building my own version of the device.
After five years and a few prototype revisions of the Version 2.12 Programmable Voltage reference, I decided it was time to update the project based on many requests and lessons learned from prototypes over the years.
After building the ASCII Video Terminal Kit, I decided to create an updated circuit board based on the original Geoff Graham ASCII Video Terminal project, which was then later updated by Peter Hizalev and sold on Tindie.
The HP 11456A Read Out Test Card is a nifty little test board that plugs into the HP 3470 series display modules. I really wish that I had had one of these, before I started working on my faulty HP 34740A display module.
