Category Archives: Fun Circuits



Infrared (IR) Cordless Headphone

This is the schematic diagram of Infrared (IR) cordless headphone. Maybe it also can be called “wireless headphone”, but it use infrared as sound signal carrier. It use a pair of circuit diagrams that are IR transmitter and IR reveiver. Using this low-cost project one can reproduce audio from TV or other electronic devices without… Read More »

Simple Traffic Light Controller

Here the simple traffic light controller which is could be used to educate kids rudiments of traffic light guidelines. The circuit utilizes easily available electronic parts. It generally consists of rectifier diodes (1N4001), a 5V regulator 7805, two timers circuit using IC 555, two relays (5V, single-changeover), three 15W, 230V light bulbs and also several… Read More »

Circuit For Quiz Contest : Electronic Jam

This is the design diagram of electronic jam. This jam circuit can be implemented in quiz contests in which any participator who pushes his switch (button) prior to the other participants, will get the first opportunity to answer a question. The circuit provided right here allows up to eight participants with each one assigned a… Read More »

Ticking Bomb Sound Generator

Here the low cost and easy build circuit of ticking bomb sound generator. This circuit generates a sound matching to a loud clicking clock. The frequency of the tick is altered through the 220k potensiometer part. The circuit gets going by charging the 2.2uF and when 0.65v is on the base of the NPN transistor,… Read More »



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