This circuit is from a 1964 Electronic Design. The sensor is an LDR and the transistors are general-purpose types. The circuit triggers when the light that falls on the sensor is cut off.
This circuit produces a clef sound when a pulse is applied to its input. The damping effect is...
This circuit is from a publication by Newton C. Braga in the United States. The transistor can be...
In the figure we have a classic Clapp oscillator configuration for a frequency of a few tens of...