Auto power cut off timer circuit
An automatic timer switch turns OFF a load itself after a fixed period of time. The circuit will be useful for various devices which we forget to turn OFF such as light, alarm, indicator circuits,...
Category: Circuits
LED chaser circuit using IC 4017 and 555
An LED chaser or LED running light can be used as a decorative light, fancy light, chasing taillight for vehicles, etc. The circuit consists of a 555 astable multivibrator circuit and a 4017 counter...
ON OFF Latching switch circuit diagram using IC 4017,555
A Push On Push off latching switch can use to ON and OFF the load alternatively with the same push action. Push on push off switch using 4017 This circuit is using a decade...
Non contact AC voltage detector circuit
A non-contact AC detector is an easy and safe AC live line tester device. It can detect the presence of an alternating current through a conductor without any electrical contact. This is a very...
Vibration sensor alarm circuit diagram
The circuit can be used as an intrusion detector alarm which can be simply placed on doors, floors or any surface where any vibration or pressure is generated during any intrusive actions. This burglar alarm...
Resistor calculations | series and parallel circuits
According to Ohms law, the voltage drop across a resistance is directly proportional to the current flowing through it, V ∝ I. I – The amount of current through the resistor in the unit of...
Derivation for voltage across a charging and discharging capacitor
Here derives the expression to obtain the instantaneous voltage across a charging capacitor as a function of time, that is V (t). Consider a capacitor connected in series with a resistor, to a constant DC...
DC motor direction control using relay circuit
A Relay based DC motor controller works with an H-bridge arrangement. With an H-bridge circuit, the polarity across a load can be altered in both directions. In the Dual SPDT motor driver circuit, the...