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As friends many take an interest the circuit about IC 555 which be integrated highly popular that circuit. I then lead the circuit sets the time be Basic Timer Control with NE555 come to present again. By it basically the base of the circuit sets the time work instruction easily initial. Press S1 for a [...]
Suitable for computer cooling fans
LED motor speed indicator
The required number of reporters, this simple design can accurately control the speed of the 12V DC motor fans, is directly proportional to the temperature.
Ntc the Arab-Israeli re-thermal (r1) as a temperature sensor, direct drive coupling of the two complementary transistors wired in the DC feedback circuit.
An optional [...]
Gradually increases speed as temperature increases
Widely adjustable temperature range
R3’s - R4 and-P1 - R1 is wired as a Wheatstone bridge in the R3’s - R4 a fixed supply of two-thirds of the “reference” voltage-P1 - R1 a temperature-sensitive “variable” voltage In the first quarter and the balance was used as a bridge detector.
P1 is adjusted [...]
