Speed ​​detector control circuit

WIFI test head can be customized for other specifications

Test - lowercase jpg

Kaixin micro test

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

As shown in the figure, A is a parametric amplifier, the driving motor M rotates, m is an optical disc that rotates with M, and uniformly opens a hole around the m circle, so that light passing through the hole can be irradiated to the photodiode 2CU2C. When there is light irradiation 2CU2C When the transistor 3DG100B is turned on, a lower jump pulse is generated to trigger the 555.555 to form a one-shot circuit. Each time after being triggered, the output timing is a high-level pulse of tw=1.1RC, and the high-level DC average is from the header. B indicates. When the m rotation speed is high, the number of illuminations of 2CU2C is accelerated, that is, the time between two separations is shortened, the chance of outputting the high level of 555 is increased, the average voltage of the DC is also increased, and the value indicated by the head B is large. If the motor M is controlled by the parameter amplifying circuit A, the M rotational speed can be stabilized at a given value.