Long time timing circuit composed of LM106 lamp

(1) Introduction to circuit principle As shown in Figure 3-22, it is
a long-term timing circuit composed of LM106 and so on. This circuit is a VT1 (FET tube)
Miller integrating circuit. If the gain of this circuit is A, the timing time
constant can be increased to A times. The gain of VT1 is about 60. Converted to
the equivalent capacitance of the VT1 gate, it increases by 60 times, that is, 60G = 60tiF.
The maximum value of the shelf resistance is 10Ma, so the timing time can be
up to 600s. Sl is the reset switch, which resets when connected to 1. At this time, VT2
is turned on, and cl is reset by discharging VT2.
LM 106 is a comparator circuit, and its output is connected to the corresponding timing
control.
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    (2) Component parameter selection. The selection of components is shown in Figure 3-22
. There are no special requirements. (3) The long-term timing circuit
composed of LIW06, etc. is shown in Figure 3-22.