Archive for March 2018

A Differential Amplifier Based on INA117

Differential amplifiers come in handy in applications where common-mode noise and interference are present in the system. This is largely attributed to the very high common-mode rejection ratio (CMRR) these amplifiers provide. And because of the high CMMR they are well suited in high-side current measurement applications and in situations where voltages must be measured deferentially. So over the past couple of weeks, I made a differential amplifier PCB based on TI’s INA117 and it will serve as building blocks for some of my future projects. Continue reading ‘A Differential Amplifier Based on INA117’ »

HP 8620C Sweep Generator Repaired

In my previous post, I did a teardown of an HP 8620C sweep generator along with an HP 86245A 5.9 GHz to 12.4 GHz RF plugin. A few of the plguin boards in the 8620C had leaked capacitors and also there seemed to be some sort of mechanical issue as no power was delivered to the transformer regardless of the power switch positions. So what I planed to do next was to restore the power to the unit and replace those bad capacitors and see if I could bring this sweep generator back to life. Continue reading ‘HP 8620C Sweep Generator Repaired’ »