I evaluate some Hantek T3100 oscilloscope probes. These are x100 probes, that I bought for using on high-voltage projects, such as tube radios.
Read MoreCategory: Electronics Projects
Ebay VCO module evaluation
I ordered some cheap VCO modules from eBay. Only $20, using an MC1648 VCO oscillator chip, and they work from 70Mhz to 200Mhz.
Read MoreLM2576 constant voltage / constant current switching power supply
I design an adjustable voltage / adjustable current limit power supply using an LM2576 buck converter. For the current limit function, I use an op-amp to measure the current from a sense resistor, a second op-amp to compare that to a pot, and then feed that signal back into the feedback pin.
Read MoreDIY RF Signal Generator
I build an RF signal generator from an article in Nuts and Volts. I learned many things about RF circuits during this project, and the blog post details some of the lessons.
Read MoreLearning to use the GALI-55 MMIC
I didn’t know what the heck I was doing when I tried to use a GALI-55 MMIC in my RF signal generator. A few basic mistakes led to hours of diagnosing the problem.
Read MoreMy new KG-650 RF Signal Generator
I bought an old tube RF generator on eBay. It works surprising well considering the age of the technology. I use my Rigol scope to view some of the waveforms and play with the RF generator a bit.
Read MoreCreating the ultimate home automation keypad
I wanted a control center mounted to my monitor that I could use for important home automation functions. I build some custom keypads using Cherry MX blue keyswitches and interface them to a Raspberry Pi. I add a VFD display for status info.
Read MoreInterfacing a VFD display to the raspberry pi
I interface a vacuum fluorescent display to a Raspberry Pi.
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