How to make an inductive electronic welcome device?

The integrated circuit IC1 is a CMOS integrated circuit integrating signal amplification, audio signal generation and power amplification. In order to reduce the size of the entire electronic welcoming device, all external circuits are integrated on one circuit board.

Figure 1 Inductive electronic welcome circuit

(2) Inductive electronic welcome component list

The list of inductive electronic welcome components is shown in the table.

(3) Installation and commissioning

1) Installation of the photoresistor

In order to allow the photoresistor to be reliably mounted in the case, the manufacturing process is as shown in Figure 2.

Figure 2 Photoresistor installation

Remark: After the two pins of the photoresistor pass through the two holes of the mount, bend around the two small ears of the mount, then put the photoreceptor on the mount, and the two leads of the photoresistor are soldering on the opposite side with bending

2)

Electrolytic capacitor installation

Since the inductive welcome device is relatively small, the installation of components should be relatively compact, especially the electrolytic capacitor C2 and the triode Q1. Due to the relatively large size, the flat mounting should be considered during soldering.

As shown in Figure 3.

Figure 3

3) Lead wire installation In the circuit production, the speaker (horn), the photoresistor and the connector between the battery and the circuit board are all completed by the lead wire.

Since the horn and the photosensitive electron have no polarity, so two The line does not have a direction.

But the connection to the AG13 battery must pay attention to the polarity, otherwise it will easily damage the integrated circuit if it is reversed for a long time. Inductive electronic welcome device shown in Figure 4.

Figure 4 inductive electronic welcome device

In this production, in order to achieve better sensing effect, the photoresistor is subjected to light absorption treatment, that is, a black cylinder is used to mount the photoresistor therein, so that the sensing signal can be better received.

This article is from Allicdata Electronics Limited. Reprinted need to indicate the source.

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