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2 Siren Circuits you can Build at Home

In this post we learn about a 2 simple siren circuits, using Arduino and also with ordinary components such as transistors and capacitors yet is able to produce an alarm sound at an excruciating level. The idea was contributed by “Abu-Hafss” Deeper in the article we also learn to make an advanced Arduino based design … Read more2 Siren Circuits you can Build at Home

Adjustabe CDI Spark Advance/Retard Circuit

In this post we’ll learn about a simple circuit which allows a manual adjust feature for the spark timing of a motorcycle’s CDI either to achieve an advance ignition, retarded ignition or simply a normal timed ignitions. After a comprehensive study regarding the subject I was apparently successful in designing this circuit which can be … Read moreAdjustabe CDI Spark Advance/Retard Circuit

Make this Car Interior Light Fader Circuit

The post explains a simple circuit which can be used for producing a slow fading light effect each time it’s switched OFF. The application can be typically used in car interior lights. Designed by: Abu-Hafss  The Circuit Concept Most of the modern cars are equipped with circuitry which switches on the Car’s room lamp when … Read moreMake this Car Interior Light Fader Circuit

Mosfet Based SPDT Solid State DC Relay (SSR) Circuit

In this post we’ll study a simple high current mosfet based solid state relay, which can be used in place conventional bulky SPDT mechanical relays. The idea was requested by Mr. Abu-Hafss. The Design A simple high current SPDT solid state relay or an SSR can be constructed using a couple of mosfets and an … Read moreMosfet Based SPDT Solid State DC Relay (SSR) Circuit

Simple 1.5 V Inductance Meter Circuit

Here a simplest yet quite accurate inductance meter is presented, which can be built within few minutes. Furthermore, the circuit can be powered-up with a single 1.5V cell. However, a frequency meter would be required to work-out the inductance. Designed and Presented by: Abu-Hafss  Using Cross-Coupled NPN BJTs The circuit is pretty straight forward wherein, … Read moreSimple 1.5 V Inductance Meter Circuit

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