Relay Ldr Circuit Diagram 230v. 105j 400v 2. The ldr circuit diagram works like this.
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Normally the resistance of an ldr is very high sometimes as high as 1000 000 ohms but when they are illuminated with light resistance drops dramatically. The rectified signal is flattened with the c1 electrolytic capacitor. Here we can swipe our hands above the ldr to turn on off the electrical appliances.
Normally the resistance of an ldr is very high sometimes as high as 1000 000 ohms but when they are illuminated with light resistance drops dramatically.
The diodes are connected in the form of a bridge used to alter the ac voltage into dc. This makes the voltage at the base of the transistor too low to turn the transistor on. These circuits uses directly 230v ac. Preset 1mω 1.
