Inverted by the gain op amp FC3

The figure shows the inverted amplifier line composed of the medium gain op amp FC3. The analog amplifier is to make the output signal and the input signal phase opposite. The gain of the analog amplifier depends on the feedback ratio.

This article refers to the address: http://

Reverse analog circuit diagram

External Frequency Compensation Component Reference Table

Pin arrangement diagram

Doorbell  speaker:


Doorbell  speaker is a kind of micro speaker unit which uses a diaphragm made of Mylar material. Doorbell  speakers are of ultrathin design and lightweight and clear voice. It is widely used in building security industry (e.g. intercom, video door phone, intelligent door control..)


There are two types of Mylar speakers from the shapes:

1)       Round shapes, we have products from 10mm to 57mm in diameter.

2)       Oblong shape, we have products in sizes of 1510/1712/1813-..

 mylar speaker

mylar speaker

mylar speaker

mylar speaker


Q1. What is the MOQ?
XDEC: 2000pcs for one model.
Q2. What is the delivery lead time?
XDEC: 15 days for normal orders, 10 days for urgent orders. 
Q3. What are the payment methods?
XDEC: T/T, PayPal, Western Union, Money Gram. 
Q4. Can you offer samples for testing?
XDEC: Yes, we offer free samples. 
Q5. How soon can you send samples?
XDEC: We can send samples in 3-5 days.

Doorbell Speaker

Doorbell Speaker,Doorphone Speaker,Video Doorphone Speaker,Doorbell Wireless Speakers

Shenzhen Xuanda Electronics Co., Ltd. ,