HP 436A Power Meter Teardown
HP 436A is a power meter capable of measuring RF power between -70 dBm and 44 dBm (roughly between 0.1 […]
BJT In Reverse Avalanche Mode
Transistors operating in their avalanche regions are often used to generate fast rise pulses (see avalanche pulse generator using 2N3904). […]
Extending DAC Resolution Using Digital Potentiometer
One way to extend the resolution of a digital-to-analog converter (DAC) is by employing a sigma-delta converter in software. The […]
Testing of Two Three-Phase BLDC Motor Drivers
I was doing a project that needed a driver for hard disk spindle motors. While I could use a microcontroller […]
Simple hFE Adapter For Cheap DMMs
Getting a rough measurement of the transistor hFE’s is useful when designing analog circuits. Unfortunately, only the lower end DMMs […]
Peltier Cooler Module Repair
I bought a couple of Peltier cooler modules on eBay a while ago for some experiments. Of course, as I […]
A Digitally Controlled Dual Tracking Power Supply — III
In part 1 of this series of blog postings, I showed my preliminary design of a dual tracking linear power […]
A Digitally Controlled Dual Tracking Power Supply — II
In my previous post, I showed my design of a dual tracking ±30V linear power supply. My goal was to […]
A Digitally Controlled Dual Tracking Power Supply — I
Power supply is one of those things one can never have too many of. I have quite a few already, […]
Using LTC1100 As Precision Voltage Adapter
A while ago, I built a precision voltage adapter using LMP8358. In this post, I will show you a similar […]
Building a Constant Current/Constant Power Electronic Load
A while back I built a simple constant current electronic load using an aluminum HDD cooler case as the heatsink. […]
An Isolated DAC Using PWM Output
Arduino‘s (ATmega328P) PWM outputs via analogWrite can be conveniently turned into analog voltage levels through the use of simple RC […]
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 […]
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 […]
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 […]