Simple Electronic Circuits

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Find simple electronic circuits for school/college projects and commercial purposes.

Power failure and resumption alarm and indicator circuit using 555 timer ic

This is a very simple circuit built using only a few components to detect ac mains power failure and its resumption. The heart of the circuit is the most popular timer Ic 555 which is wired as monostable multivibrator. ac power supply failure alarm circuit…

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6v Battery Charger Circuit With Auto Cut Off Using LM317 And BC547 | battery charging circuit with auto cut off

Circuit Diagram Parts Required T1 - 230V to 15/18V/1Amp transformer. BR - 1A Bridge rectifier(or four 1N4001 diodes) IC1 - LM317T C1 - 1000MFD/40V C2 - 0.22MFD/40V C3 - 0.22MFD/25V C4 - 470MFD/25V Q1 - BC547 R1 - 0.56E/5W R2 - 220E-1/4W R3 - 100E-1/4…

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[Multi-Colour] Automatic Night Lamp Circuit Diagram Using LDR And CD4017

Nіghtlіghtѕ are uѕеful to show thе gеnеrаl lауоut оf a rооm without turnіng on a major light, for аvоіdіng trірріng over ѕtаіrѕ оr оbѕtасlеѕ, оr tо mаrk аn emergency exit. Hеrе іѕ a ѕіmрlе multi-color nіght lіght сіrсuіt whісh hоldѕ fіvе different соlоrѕ. The dіffеrеnt…

Using this circuit, we can charge 4-volt lead acid battery with the current ranging from 2Ah to 10Ah using appropriate transformer or SMPS. With necessary modification, we can use this circuit to charge 6v,12v or 24v batteries too! The circuit published here is meant for charging a 4v, 4.5 or 5Ah lead acid battery. AC voltage from a 9v stepdown transformer is rectified using the bridge rectifier (BR). LED1 indicates the mains charging and the current flowing through it is limited through resistor R7. C acts as a filter capacitor. Rectified output is fed to the voltage regulator(U1) through diode D3. The Ic U2 is the heart of this circuit. It is a low power dual op amp ic. Zener diodes D1 and D2 act as the reference voltage. In order to make adjustments, connect a variable DC power supply in the place of the battery and set it to 4.5v. Now adjust the preset R1 until the LED2 lights up. Then set the variable DC power supply to 3 volt and adjust the preset R3 until the LED3 lights up. Now connect a 4v battery by replacing the DC power supply. Now the circuit is ready for use. The battery voltage does not go beyond 5v because of the voltage regulator thus protecting it from overcharging. This circuit can be easily assembled on a general-purpose PCB.

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4V Lead Acid Battery Charger Circuit With Overcharge Protection And Status Indicator

Circuit Diagram Parts Required 9v,500mA Transformer BR - Bridge rectifier (W04 or DB107) Using this circuit, we can charge 4-volt lead acid battery with the current ranging from 2Ah to 10Ah using appropriate transformer or SMPS. With necessary modification, we can use this circuit to…

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Battery Level Indicator Circuits

Battery Level Indicator Circuit Using Dual Op Amp Ic LM358 To Monitor 12V Battery Parts Required Rеѕіѕtоrѕ: (1/4 Wаttѕ) R1 - 10K R2 - 10K R3 - 10K (рrеѕеt) R4 - 10K (рrеѕеt) R5 - 1.5K R6 - 1.5K R7 - 1K R8 - 1.5K…