Guarding Explained
In electronics, guarding is a technique typically used to prevent or minimize current leakage from a high impedance source. This […]
Building A Laser Oscilloscope
You can generate some pretty amazing patterns by shining a laser onto a mirror mounted on a vibrating speaker cone, […]
When to Use An Electrometer?
Electrometer is a piece of highly specialized electronic test equipment. Most of us would naturally associate it with low-level measurements […]
Samsung Galaxy S-Pen Waveform Capture
I was quite intrigued by the S-Pen that came with my Samsung Galaxy Note 4. According to the specifications listed […]
Keithley 614 Electrometer Teardown
In this blog post, we will take a look inside a 1980 vintage Keithley 614 Electrometer. While it was designed […]
Turn Your Android Phone into a Wireless Touchpad
In this blog post, I will show you a simple way of turning your Android phone into a wireless touchpad. […]
Reverse Engineering a Beseler PM2L Color Analyzer
I recently acquired an old Beseler PM2L color analyzer. This kind of color analyzer was designed to analyze the color […]
Wavetek 1045 RF Power Meter Teardown
I bought a Wavetek 1045 RF power meter off eBay a few weeks ago. It came with a 13787 detector […]
How to Drive a Latching Relay
Latching relay (a.k.a. impulse relay) can be turned on and off by momentarily applying a voltage across the relay coil. […]
T is for TWT
Traveling-wave tube (TWT) is mainly used to amplify signals in the microwave frequency range. Unlike most vacuum tubes, which had […]
Visualizing Comparator and Op Amp Hysteresis
Hysteresis can be added to a comparator circuit to improve its stability, especially when the input signal is noisy. In […]
Testing an RTL-SDR Spectrum Analyzer
Using software defined radio such as the popular RTL-SDR (1, 2) as a spectrum analyzer is nothing new (examples can […]
Keithley 197 Battery Option Build
I have been quite happy with my fixed-up Keithley 197 5 ½ digit bench meter purchased from eBay (you can […]
Using Arduino Due’s True Random Number Generator
Arduino Due uses an Atmel SAM3X8E ARM Cortex-M3 CPU, which has a native hardware based True Random Number Generator (TRNG). […]
Building And Characterizing A DIY RF Power Sensor
Ever since I got my HP 436A power meter, I have been looking around hoping that I could obtain a […]