Tag: lcd

Hiland M644 Multifunctional Transistor Tester LCR Resistance Inductance Diode Capacitance ESR Frequency Meter PWM Signal Generator (WHL #50)

Another component for one of the upcoming projects – a refreshed transistor tester.

I’ve been using these for ages now, I actually built two of them before they got popular (what a hipster thing to say?) and every Chinese seller decided to roll his own. The original thread on mikrocontroller.net dates back to early 2012 and the SVN repository even contains a few fixes of mine to the manual, as I was proofreading this thing at the time.

Times have changed, and the ready made versions are so cheap nowadays that homebrew really doesn’t make any sense any more. […]


PWM Pulse Frequency Duty Cycle Adjustable Square Wave Signal Generator Module (WHL #43)

Haven’t reviewed a lot of China gadgets lately, have I? Well, what about a tiny PWM generator…

I remember having the need for some good old TTL PWM signal and being too lazy to program an Arduino for it. I mean it is dead simple and there are examples included, but hooking up some knobs for live modification of the duty cycle and possibly the frequency as well, nah. There has to be a Wan Hung Lo solution to this, and indeed, there is.

This unit was actually purchased via eBay, as Ali wanted significantly more money for it. I’ve checked and now the eBay is the more expensive dealer, as it basically always is these days. […]