A single 1.5 V silver oxide button cell powers this complete touch activated switch circuit for 5 years. It features both a normally open and a normally closed set of solid state switch thermals. It also has an adjustable sensitivity, which can be ...
Courtesy of this circuit’s flexibliity, you can select and adjust both, one, or none of the channels of a dual digipot. One huge advantage that digital potentiometers have over electromechanicals is, of course, the inherent flexibility the ...
Simple circuit saves hard-working fingers from unnecessary wear and tear. Digital potentiometers (DPOTs) with manual up/down increment/decrement interfaces can have real utility as versatile substitutes for traditional electromechanical pots. But ...
Some folks prefer pushbutton switches to take effect on push instead of release. These buttons do that very thing. I suppose it’s really just a matter of taste, but I’ve always liked momentary contact switches that act when you push ...
Front-panel push button controls can conveniently adjust a PCB-mounted internal potentiometer’s resistance. Digital potentiometers in conjunction with MCUs find common use in analog circuits. The processor can adjust the gain of an amplifier, ...
The circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be configured for an under temperature (freeze) alarm. The circuit ...
This circuit uses a flat piezoelectric wafer, glued inside a plastic box, as a finger tap sensor. With each tap of a finger to the box holding the wafer, the circuit turns on and off AC or DC power to an external device. The circuit is powered by a ...
Electronic systems must often isolate their inputs or outputs from the main reference common (ground). Various conditions can make necessary such galvanic isolation: the type of input sensor or driven actuator, safety considerations for medical ...
Often you want to turn on and off power to a device with a single pushbutton switch. The circuit below performs this logic function with just a few parts and can operate from DC supplies between +3 V to about 15 V. It uses two inverters within a ...
I designed the circuit in Figure 1 as a part of a data transmission system that has a carrier frequency of 400 kHz using on-off keying (OOK) modulation. Figure 1. A digital frequency divider circuit that detects the presence of a 400-kHz carrier, ...