One Thing Leads To Another

A project I was set on doing was my 100W/channel Hi-Fi Amplifier.  But it has snowballed into 3 projects now and some new test equipment.

While designing my amp I find that I need a current limited 500V power supply.  Well, there aren’t too many affordable ones out there.  Check that…there arn’t any any affordable ones.  So I started designing and building my own.  I wanted to verify the accuracy of the current meter/limited and see how it works under different loads.  So now I need a electronic load for testing.  Again, there aren’t any decent affordable loads so now I have to design and build one.  The list keeps growing.

I also just purchased some “new to me” (used) multimeters.  I currently have three meters (Metex, Tenma, UNI-T) and they all give wildly different readings on the same signal.  So I just ordered (2x) GW Instek GDS-8142 (4-1/2 digit) and (1x) Keithly 2015 (6-1/2 digit).  The GW Instek were just about being given away (~$20 ea) but the Keithly made up for it at $650.  I hope this stuff works better then my current crap.

Watch Is Still On Hold

I put the Smart Calculator Watch project on hold a while ago when Cypress announced that they would be coming out with their PSoC 6 chip.  Since this chip has greater performance and lower power consumption, I felt it prudent to wait and evaluate the new chip.

A “Smarter” Watch


For over 20 years I have been carrying my beloved Casio calculator watch on my wrist.  Alas, time and abuse have taken their toll and my beloved watch ceased operation.  Originally I was going to replace it with a Casio Databank watch, but their evolution of functionality seemed to have stagnated for the last 10 years.  I also looked into smart watches but their price and dependency on being linked to a cell phone was a major drawback for me.  So I replaced my trusty Casio CA-53W calculator watch with another one.  (Thankfully Casio still makes them…and their relatively inexpensive.)


This fueled my inner engineer to see if it is possible to make a “smarter” watch.  I am looking at designing something that has greater functionality than my calculator watch and even the databank watches, yet maintains independence from requiring a smart phone.  (Although I might give it the ability to link with a phone, it just wouldn’t require it.)

You can find project details here.