Archive for September 2013

Fixing a Global Specialties 1301A Power Supply

One of the things I love to buy from eBay is linear power supply. Labs and industries routinely clear out older power supplies and many of them end up on eBay. And unlike many other used electronics, linear power supplies are well understood and relatively easy to fix. I recently picked up two none-working Global Specialties 1301A’s next to nothing and spent a little time fixing them up. Continue reading ‘Fixing a Global Specialties 1301A Power Supply’ »

Yet Another Semiconductor V/I Curve Tracer – II

In my previous post, I showed my design of a semiconductor V/I curve tracer and discussed its theory of operation in detail. As promised, I will share some of the test results here. If you have not read my previous article, I would recommend that you take a look at it first. Continue reading ‘Yet Another Semiconductor V/I Curve Tracer – II’ »

Yet Another Semiconductor V/I Curve Tracer – I

Semiconductor curve tracers were frequently used in analog circuit designs many decades ago, at a time when discrete semiconductor devices were in dominance and ICs were scarce. While curve tracers are no longer widely used nowadays due to the ubiquity of digital circuitry and computer aided designs, they are still quite popular in the educational world and among hobbyists. In this and the next post, I will discuss some of the design considerations of a curve tracer that I built and show some real-world measurement results. Continue reading ‘Yet Another Semiconductor V/I Curve Tracer – I’ »