This circuit for musical instruments was found in a 90’s Elektor. The circuit still applies, as the components used can still be obtained with some ease.
This inverter can source voltages up to 400 V from a 3 to 6 V supply, but output current is very...
This shoot-to-target game uses well-known CMOS circuits and the player hits the LED by squeezing...
This indicator for audio signals uses only 3 components. LEDs are common and the audio signal with...