Simple emergency light circuit with charger
This is Simple emergency light circuit with charger that light on 30 minutes after the power outage, so use normal transistor as base of circuit. At the time of power failure. Especially during the night. Many people do not like the dark. Emergency lighting systems on the market, it has …
Time delay for relay using CD4011
This time delay relay circuit can be used to time delay for the load, To be connected to the relay output to run after a specified time. Which during this time. Can be adjusted by changing the R1 and / or C1. The current of circuit is limited by type …
Frequency generator circuit using LM3909
This is a simple Frequency generator circuit using LM3909. The IC is almost all you know it. Because there is a famous story of its use as a flashing light to save energy and external devices. But in fact, it can also be the same ICs frequency generator. Because the …
Simple blown fuse alarm circuit  for AC line
This is an Simple blown fuse alarm circuit for AC line, cause we know immediately when broken fuse circuit and it has a few components so easy to build and very cheap. Fuse Electronic devices that are important to prevent damage to the circuit. When a short circuit occurs, but …
Automatic day indicator circuit
This is Automatic day indicator circuit, by LED display each day one by one LED. Which use principal of light-activated in day with sun. To set a LDR-sensor and CD4017 acts as drive LED of 7 pcs for 7 day there. Sometimes that we enjoy working and forget days. Which …