| 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...
RS-elc (17)
| 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...
| 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...
| Lowpassfilter with voltage controlled frequency and Q (up to oscillation). Runs on single supply 5V and can be sweeped from 16kHz to 30Hz wi...
| Music synthesizer based on noise and pattern generation. Sound effects, percussion and pitched sounds can be generated. Comes with multimode...
| Electric charge detector using 3 components only. Warns you when electrically charged objects appear. Runs for months on a battery.