The sound of drums can be obtained with these two touch-triggered double-T oscillators. The circuit is from a Radio Electronics Special projects from 1993.
This circuit is from an old Elektor using components that are not currently common. The circuit is...
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
Here we have an interesting circuit found in a 1981 publication that causes two LEDs to flash...