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Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts.......
This is a CMOS IC (CD4033) based circuit which can be used to detect presence of mains AC voltage without any ......
Here is a handy gadget for test- ing of infrared (IR) based re- mote control transmitters used for TVs and VCR......
Many a times one needs an ex- tra telephone ringer in an ad- joining room to know if there is an incoming call......
Here is a telephone line vigilant circuit to guard against mis- use of your telephone lines. It monitors telep......
This circuit enables automatic switching-on of the tape recorder when the handset is lifted. The tape recorder......