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.
Everyone should have at least two of these ESI 250DE Impedance bridges.
Well that was not my first thought when purchasing this unit on Ebay.
I was still having some issues with the “Internal DC” detector circuit on my existing unit, and the price of this unit was extremely reasonable. After dozens of hours troubleshooting the first unit with no solution, my thought was to compare the two circuits and salvage parts from the new unit if necessary.
An updated version of the Millivolt Meter project from May 2016, with dual range selection, calibration selection, improved software, and updated board layout.
Continue reading “Millivolt Meter Version 2”
Finally assembling the electronic load modules for some basic testing of minimum voltage at different current levels, and heatsink thermal capacity.
Continue reading “Linear MOSFET Electronic DC Load — Part 2″Repair and cleanup of a vintage Keithley Instruments 600A Electrometer.
A very interesting find on Ebay from several years ago was an all steel version of a J.H.W. CLIMAX Co padlock.
Click on photos for a larger image
Cleanup and check of a Mettler Instruments K4T single pan top loading balance.
After owning and using this K4T balance for over twelve years, I thought it was time for a full cleanup and accuracy check. When first purchased from Ebay it received a quick cleanup, function, and accuracy check, before I quickly put it to use.
Continue reading “Mettler K4T Balance”Cleanup and repair of an ESI Dekastat model DS1463 12K Ohm coaxial decade resistor.
Fixing issues with the 4 digit plus mode revision 1.1 multimeter board.
Developing a new 4 digit plus mode display for a Power Designs Inc. 6050C power supply capable of displaying current at a milliamp resolution, and voltage at a 10 mV resolution.
Continue reading “Upgrading a Power Designs Inc. 6050C with a 4 digit plus mode display”
Cleanup, repair, and upgrade of a Hewlett Packard (HP)6200B power supply.
Continue reading “Hewlett Packard 6200B Power Supply Repair”
Cleanup, repair, calibration check, and display upgrade of a Power Designs Inc. 6050C Universal DC Source.
Continue reading “Power Designs 6050C Power Supply Display Upgrade”
My latest project is a prototype I2C RGB LCD display board with added EEPROM and some other extras.
Repair and Cleanup of a ESI 250 DE Universal Impedance Bridge.
A GPS disciplined 10 MHz oscillator and distribution amplifier project using a Sparkfun Pro mini microprocessor and an Isotemp 134–10 OCXO. (Click on images for larger version)
Cleanup, repair and Calibration of a Power Designs Inc. C500 Precision DC Source.
Cleanup and Calibration of a Power Designs Inc. 2005A Precision Power Source.
Continue reading “Power Designs 2005A Precision Power Source”