Mare writes, “In this post, I will first introduce some of the basic technical background of the control of the transmit signal (PTT) and other signals (eg CW or linear activation). The second part will describe the interface development and the final product.” More details at Mare & Gal Electronics blog.
Marko Pavlin has designed a PCB for the CW keyer, he writes: I designed dedicated PCB for the CW keyer. The project is very similar to the version made on prototyping board. Here are the updates: – I added relay and optocoupler for PTT control – The “CW melody” selection pins have three jumpers for 8 […]
Chris from PyroElectro constructed this waveform generator using an op-amp, resistor ladder, some trimpots and an Arduino. You can find all the information on how to make your own step-by-step with photos, schematic and code at PyroElectro. Via the contact form.
Moser from ReiBot has developed a simple project for using an Arduino along with an LM399 and several discrete components to measure inductance. He says: So you need to make or measure an inductor, but you don’t have an oscilloscope or signal generator? Measuring inductance with a handful of cheap common parts is certainly possible. […]
Chris from PyroElectro was looking for a way to miniaturize his previous VGA test box to make it more suitable for portable use. He came up with this design for a Mini AV Test Box for portable testing of VGA displays and speakers. His project fits a full fledged AV tester into a mint-tin can […]
Vasilis Stergiopoulos has built a RJ45 LAN cable tester. The circuit was originally designed to use a 555 and 4017 IC, but Vasilis has published the schematic and source code in assembly for using the Attiny2313 instead. The Attiny2313 produces successive outputs at port D, where the LAN-cable is connected. If a straight cable is […]