Timing circuit composed of quartz electronic clock integrated circuit

(1) Introduction to circuit principle The pulse signal provided by the quartz electronic clock integrated circuit is very accurate. Therefore, in addition to being widely used in quartz electronic clocks
, it is also very suitable for time reference circuits and timing circuits. As shown in Figure 3-34, Shizao electronic bells and temples are used. The principle circuit of the sticky pulse
signal generation circuit composed of circuits. The operating voltage of the integrated circuit is provided by the forward voltage drop of two rectifier
diodes (2CP), and the power supply can
be selected between 1.5 and 15v. The other two detection diodes (2CP) and the transistor
(3CG) form a NAND gate logic circuit. When the electric boat is working,
a stable and accurate second signal can be obtained at the output terminal (transistor collector).
A 32.768kHz quartz crystal and a
5~.30pF variable capacitor for frequency fine-tuning are connected to the periphery of the circuit . Quartz electronic clock integrated circuits can optionally
use low-frequency clock circuits. Such as LH5544 or 1. H5093 and other models.
    (2) Component parameter selection The selection of components is
shown in Figure 3-34. There are no special requirements.
    (3) The timing circuit composed of quartz electronic clock integrated circuit is shown in Network 3-34 .