相关元件PDF下载：BC547 BC557 Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or whe...
相关元件PDF下载：4001 BC547 This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and no...
Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow ...
相关元件PDF下载：LM386 In this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common...
相关元件PDF下载：4081 This switch will suit the Modular Burglar Alarm circuit. However, it also has other applications. The Keypad must be the kind with a com...
