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need a cheapest timer with out transformer,minimal component

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ambrose

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:( anybody out there with a timer circuit .

i am in search of a cheap timer to opperate a mosquito repelent device.a cyclic on off timer without transformer .the timing should be 15min -30 min mode .no micro controller stuff .if it is a cmos 4000 series good.
 

Russlk

New Member
The 4521BE is a 24 stage counter with oscillator, just add the necessary R and C. It won't drive a relay so you will need a transistor driver. The power required is low enuf that you can just rectify the 60 Hz and use a resistive divider to get 12 VDC.
 
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