390Ω in the opto-led circuit means that ~5mA passes through the opto-coupler when ever the probes are touched. 5mA is the design current for the X-suffix EL816 (salvaged from a commercial fluorescent ...

The first is a CNC machine. Drop a piece of FR4 under a cutter, and you’ll get a circuit board and a lot of fiberglass dust. The Othermill is great for this , but it is a bit pricey for all but ...

A common enhancement to this circuit replaces R2 with an inductor as shown in Figure 2. Figure 2 Substituting an inductor for R2 improves the piezo driver’s output and efficiency. Often the inductance ...

There was an intention to use the Cuk configuration circuit again, like the old circuit in EDN, but with an output voltage of about -1 V only and a low—less than 2 mA—output current. While exploring ...

This circuit was designed to meet a medical application’s requirement to drive a laser diode with reasonable precision and a minimum of components and footprint (the device is now in clinical ...