This rain, flood or leak sensor was found in a 90s Popular Electronics. All the components used are common today. The transistor can be the BC548.
The circuit shown in the figure produces pulses of high intensity light at a frequency that...
The circuit shown here produces a pure square tone of 440 Hz that is suitable for musical...
The operating principle of the VCO shown in the figure is the same as the CIR4598 circuit. The...