Posts tagged ‘Switching Power Supply’

Reverse Engineering of BK Precision 1696 Switching Power Supply’s LCD Protocol

As mentioned in my previous post, besides the broken LCD there was also an issue with the power supply portion of the unit and the output voltage was clamped at around 10 to 11V. The digital circuitry portion however seemed to be intact. Unfortunately since an identical LCD is virtually unobtanium, I thought I’d reverse engineer the LCD protocol so once the power supply is fixed I can fix the display by hooking up a different LCD. Continue reading ‘Reverse Engineering of BK Precision 1696 Switching Power Supply’s LCD Protocol’ »

Teardown of a BK Precision 1696 Programmable Switching Power Supply

I recently picked up a BK Precision 1696 programmable switching power supply off eBay. Unlike many of the vintage test equipment I did teardowns with in the past, this model is still in production today. The one I got was sold with a damaged LCD screen and thus I paid very little for it. Of course, a brand new one would cost around $300. Continue reading ‘Teardown of a BK Precision 1696 Programmable Switching Power Supply’ »

Variable Power Regulator Using TPS5420

I typically use linear regulators (e.g. 7805, LM317, etc.) in my projects. Linear regulators (especially the low dropout ones) are great when the load is light and input/output voltage difference is small, otherwise you will need a big heatsink as significant amount of power is dissipated as heat. The heat issue was evident in my earlier build of the VFD clock. Given how easy it is to use a switching regulator nowadays, there really is no excuse to settle on a linear regulator in situations like this. Continue reading ‘Variable Power Regulator Using TPS5420’ »