Electronics – Page 17 – Kerry D. Wong

A Unipolar Stepper Motor Driver

The drive circuits for Unipolar stepper motors are usually very simple. In its simplest form, a transistor or MOSFET is […]

Just because you are using a true RMS multimeter does not automatically mean you should always trust the readings of […]

Most of the multimeters do not offer resistance measurement in the milliohm range. In most meters a typically Ohm range […]

One of my computers has been unstable for quite some time now. It had been crashing and freezing up once […]

One of my RSA SecureID tokens had recently expired, so I decided to do a teardown to see what is […]

The other day, I needed to measure the AC current of my water heater without having to disconnect the wiring. […]

I have built some circuits that interface with computer USB ports. On several occasions, I had built the circuits but […]

I built a 4-digit 7 segment display last year. In that design, I used four 74HC595 shift registers to drive […]

I started this project a while ago. My intention was to adapt a toy remote controlled vehicle into a generic […]

I was looking for some parts a couple of weeks ago and came across an old TV flyback transfomer, so […]

I am in the process of converting a remote controlled toy vehicle to an autonomous robotic platform. My initial thought […]

I recently bought a TrendNet TK-207K KVM switch. After hooking up my mouse and keyboard, I was suprised to find […]

I used to own an all-transistor, single channel 10 MHz analog oscilloscope. While it was not adequate by nowadays standard, […]

Using PC’s parallel port is a convenient way to control a stepper motor. For unipolar stepper motors, up to two […]

Using DTR (data terminal ready) and RTS (request to send) pins of a PC serial port (RS-232) without actually using […]