| This circuit detects if the temperature of an object became too high. The thyristor is mounted on the object that has to be temperature moni...
RS-elc (24)
| This simple oscillator uses only four passive components to make a LED blink in the dark. The circuit runs for about two years on two AA bat...
| This detector circuit uses just the Arduino Nano itself, no added sensor. Blowing some air from 30cm distance can be detected. It detects v...
| This fourth-order, voltage-controlled audio filter uses four LDRs and a single LED to adjust the cut-off frequency from approximately 20 Hz...
| Oscillator circuit using only 4 passive components to make a LED blink when it is in the dark. Note: this is a normal LED, not a blink-chip...
| This 4th order audio filter design is based on four LDRs controlled by one LED. Driving the LED you can control the cutt-off frequency from...
| Here is a serious tiny music synthesizer using an Arduino Mini as a dual digital oscillator. It has an analog voltage controlled resonant fi...
| Music synthesizer with voltage controlled analog resonant filter and analog VCA. Double oscillator with wavemodulation and two loopable enve...
| This 2nd order filter uses four passive components. Frequency control with a current/voltage. Audio examples are given for synthesizer appli...
| This simple single-supply low-pass filter features a voltage-controlled exponential cut-off frequency over nine octaves and has a voltage-co...