Upgrading a Hewlett Packard / Agilent 6632B System DC Power Supply with front panel binding posts and correcting an original design error.Continue reading “Hewlett Packard / Agilent 6632B Upgrade”
Building a light source for a Stanton Instruments, Ltd. B15 balance.Continue reading “Cree MX6 XLamp build”
Designing and building a replacement display for the Power Designs, Inc. 6010D power supply, and other Power Designs D‑series supplies.Continue reading “New display boards for Power Designs D‑Series power supplies”
Restoring a Power Designs Inc. 6010D power supplyContinue reading “Power Designs 6010D Universal DC Source Restoration”
Building a 4–20mA current transmitter and receiver for some upcoming automation projects.Continue reading “4–20mA Current Receiver”
Building a 4–20mA current transmitter and receiver for some upcoming automation projects.Continue reading “4–20mA Current Transmitter”
Refurbishing a General Radio Company 1531AB Strobotac unit built in 1975.Continue reading “General Radio Co. 1531AB Strobotac Refurbishment”
Adapting the IV-18 IceTube clock design to use the 13 digit IV-27M VFD tube.Continue reading “IV-27M IceTube Clock Project”
Cleanup, restoration, and calibration of a Hewlett Packard (HP) 6 1/2 digit 3456A Digital Voltmeter.Continue reading “Hewlett Packard 3456A Digital Voltmeter”
After finishing the IceTube clock version 1.31 build for myself, I was ready to work on the board design for some IceTube clocks as gifts. I could have used the existing V 1.31 boards, but I wanted to use an up to date design that incorporated all the hardware improvements over the past 10 years while still staying with a thru-hole design.Continue reading “Updated IceTube Clock Design”
Revisiting IceTube clock designs and construction, after performing some small repairs on an IceTube clock I built back in 2010.Continue reading “IceTube Clocks”
Updating a Hafler DH-110 preamplifier from the early-80’s with new electrolytic capacitors, along with a cleanup and then testing.Continue reading “Hafler DH-110 Preamplifier Refresh”
This is a continuation of my Wien Bridge Oscillator module design project. It houses all the parts needed for a portable Ultra-Low THD dual-frequency sine wave generator.Continue reading “Ultra-Low-THD Sine Wave Generator”
Trouble shooting and performing modifications on a HP 3437A System Voltmeter from 1984.Continue reading “Hewlett Packard 3437A System Voltmeter”
I found myself in need of a very low-distortion 1,000 Hz sine wave
generator for an upcoming project.
A quick search on Ebay found several used pieces of test equipment that met or exceeded my requirements, but were priced at well over $1,000 USD.
I did also find some low-cost China sourced 1 kHz generator boards, but they had a distortion of 0.1% which was way above my 0.005% limit.
My current test gear includes a Keithley 2015 THD Multimeter with a low distortion sine wave generator, but it is only capable of 0.03% THD at 1 kHz.
It was time to see if I could build something for under $100 that would meet my needs.
Another local Ebay find was this Hewlett Packard HP 403B AC Voltmeter in a protective HP vertical case. The case did an excellent job of protecting the meter over it’s now 48 year life.Continue reading “Hewlett Packard HP 403B AC Voltmeter Restoration”