Intersil’s application note (PDF!) on building a battery operated auto ranging DVM with the ICL7106: This application note describes a technique for auto-ranging a battery operated DVM suitable for panel meter applications. Also, circuit ideas will be presented for conductance and resistance measurement, 9V battery and 5V supply operations, and current measurement.
A sound activated switch project by Rajkumar Sharma of Electronics Lab: Clap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC. Switch avoids false triggering by using 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp. 555 timer IC […]
Bertho of Vagrearg writes: I recently answered a question about how a specific circuit worked and I was so intrigued that I just needed to write down my findings and share it. The circuit uses a single (cheap) push-button to make the output toggle with debouncing and no-delay switching. The circuit used originally two NOR-gates and […]
Tom designed this simple 12mm Rotary Encoder breakout, that is available at Github: Very simple breakout board without so much as pullup resistors, just breaking out all 5 pins to a pin header. The PCB features enlarged holes to fit generic encoders. Via the project log forum.
T0m designed a Twin Triac AC switch on DP5050 PCB: Double SSR for TO-220 package triacs and MOC* series optocoupled drivers. The schematic is based on a design by RobG posted to the 43oh forum. Via the forum.
An open source USB stack for PIC microcontrollers has evolved in the forum over the last year. It supports a number of USB-enabled PICs, and a good developer would test each chip before each release. We’ve been crowd sourcing that testing in the forum, but now prolific forum member Mats is designing a PCB so […]
This clear foot operated switch is made with a bent piece of acrylic, and a PCB with a tactile switch and mounting holes: This time,i made a lighter version, very simple to make, still with a nice operating feel. I don’t really remember where i saw this design, i think from ebay.
How to get input from multiple tact switches with a single input pin: A technique of interfacing multiple tact switches using a single ADC input pin was demonstrated using the PIC12F683 microcontroller. A digital input from four tact switches were individually read through the AN0 ADC channel and displayed it back on an LED. While […]
Make has an introduction to various switches: Easily overlooked, but elemental to electronics hardware, the manually operated switch is the simplest of electromechanical devices — and likely the most familiar. While the most basic switch is… well, quite basic, there’s a crazy-huge variety of switch types and sizes available to the electronics maker nowadays. Those […]