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SIMPLE FAN SPEED ​​CONTROL CIRCUIT WITH TRANSISTOR

4 bc639 transistors are used in fan speed control circuit and speed can be adjusted with 47k trimpot on the circuit. Intel CPU fan used in circuit tests is a low cost simple circuit for beginners based on used circuit perforated pertinax.

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EXPERIMENTS WITH DIJTAL DOORS

There are 41 applications on TTL digital doors. I am thankful to our readers, S.Demirhan(sdmh), who brought the file to me . Many of the circuits...

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