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LDR to TTL level

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Panji

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:?:

I want to convert a lamp condition to TTL level using LDR. When the lamp is on the logic from circuit is high (+5V) and when it is off the logic is low (0v). How can I build this circuit ?

Any help is appreciated.
 

kinjalgp

Active Member
Use a transistor.
Bias the transistor using Potential-Divider bias and use LDR as one of the arm of potential divider network. Use Vcc = 5V. Collector resistor = 10k. The output should be taken from collector.
 

kinjalgp

Active Member
Any general purpose NPN tarnsistor like BC547 / BC547 / 2N2222 etc.
 
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