With the configuration shown in the figure, we have the relay being activated when the microphone picks up a sound and shutdown when the X1 reset sensor is activated.
This circuit can be used as a receiver for the CIR10534 transmitter or others described in this...
This circuit produces the sound of percussion such as blocks, drum, bell, etc. The frequency...
This circuit was found in an Electronics Now from the 80's. The frequency depends on the...