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New Circuit Projects

TSOP1738 Infrared Sensor IC Datasheet, Pinout, Working

Last Updated on January 8, 2024 by Swagatam 7 Comments

tsop17xx pinout diagram

Video showing the Testing of TSOP1738 with 38 kHz Frequency The TSOP17XX series of ICs are infrared sensor devices designed for sensing infrared frequencies only with a specific range of modulated frequency, and interpreting them into a proportionate magnitude of electrical pulses at the output. This is specifically done to make the sensor immune to […]

Filed Under: Datasheets and Components Tagged With: Datasheet, Infrared, Pinout, Sensor, TSOP1738, Working

Automatic Generator Choke Actuator Circuit

Last Updated on January 2, 2024 by Swagatam 2 Comments

automaticchokeoperatorcircuit

In this post I have explained a simple automatic generator choke actuator circuit using a straightforward delay OFF timer circuit and a solenoid device.  The circuit was requested by Mr. Bob Perry. Technical Specifications I’m in need of a time delay schematic for the following project. I have an electric generator that I can start by […]

Filed Under: Voltage Control and Protection Tagged With: Actuator, Automatic, Choke, Generator

Footstep Activated LED Trouser Light Circuit

Last Updated on December 21, 2023 by Swagatam 1 Comment

led trouser circuit

In this post I have explained how to transform your ordinary trousers into a chasing LED lit trousers which produces an shooting LED light chasing effect in response to your footstep movement or thumping. The Circuit Concept The proposed foot step activated chasing LED trouser will enable you to decorate any piece of clothing with LEDs […]

Filed Under: Mini Projects Tagged With: Activated, Footstep, LED, Light, Trouser

3.7 V Li-Ion Battery Charger Circuit with Automatic Cut-off

Last Updated on November 2, 2024 by Swagatam 394 Comments

Li ion USB charger circuit

In this article we study a simple 3.7V li-ion battery charger circuit with auto-cut off, which can be charged from your computer USB port or any other 5 V regulated source. How it Works The circuit can be understood with the help of the following description: The IC LM358 is configured as a comparator. The […]

Filed Under: Battery Charger Circuits Tagged With: Automatic, Battery, Charger

Vehicle Speed Limit Alarm Circuit

Last Updated on January 8, 2024 by Swagatam 18 Comments

In our previous articles we have learned comprehensively regarding the ICs LM2907/LM2917 which are fundamentally frequency to voltage converter ICs, and are ideally applicable in all such relevant fields. Here we see how the same chip can be applied for making a vehicle speed limit alarm circuit. Using a Single IC for Speed Detection As […]

Filed Under: Automobile Electronics Tagged With: Alarm, Limit, Speed, Vehicle

Accurate Speedometer Circuit

Last Updated on May 30, 2022 by Swagatam 30 Comments

Speedometer

Here we’ll see how a simple yet accurate analogue speedometer circuit can be constructed at home using just a single IC and a few external passive components. The speedometer can be universally used with all 2-wheeler, 3-wheeler, even in bicycles for indicating their speeds. Using Frequency to Voltage Converter In my previous article I have […]

Filed Under: Automobile Electronics, Meters and Testers Tagged With: Accurate, Speedometer

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