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Presented here is an electronic toy circuit for your child’s entertainment. The concept of a joint family is disappearing, and childcare is also becoming difficult. It is best to spend some quality time with your child by doing things...
Here is a simple audio amplifier circuit based on TDA2050 IC. This amplifier can deliver an output power of around 15W for an 8-ohm load, 18W speaker with 18V DC power supply. Circuit and working The circuit diagram of the TDA2050-based...
Smart presentation pointers are readily available in the market but are expensive. Here is a simple, easy-to-build, inexpensive and infrared (IR)-based smart slide pointer using Arduino Leonardo. Slide presentations using PowerPoint can be frustrating because you may need to click...
The circuit presented here can measure voltage (V), current (A) and wattage (W) on an OLED. It is actually voltmeter, ammeter and wattmeter circuits combined in one unit. It is a useful tool for testing circuits, desktop power supplies,...
Most power-resumption alarm devices produce non-stop alarm when power resumes. To overcome this problem, here is an automatic Power-Resumption alarm circuit that sounds an alarm for a few seconds only after power resumes. Author’s prototype is shown in Fig. 1. Circuit...
Here is a simple solid-state relay (SSR) driver circuit using a transistor. An SSR is similar in operation to a traditional electromagnetic relay with movable/physical contacts. It employs an optical semiconductor, called photocoupler, to isolate input and output signals;...
This project presents an Android app to generate an alert (alarm) on a smartphone when temperature of the process under consideration exceeds user-defined maximum temperature. Alarm and annunciator instrumentation systems are widely used in the control room of process plants....
A simple explanation for the working of an ideal diode circuit based on P-channel MOSFET and PNP transistor is presented here. The typical voltage required to turn on a diode is forward voltage. An ideal diode should have zero...
Presented here is an Arduino-based dish antenna controller to align the position of a satellite dish antenna by setting azimuth and elevation angles. The dish antenna should always point to a specific satellite in space to receive maximum signal....
Wheelchairs are useful for people for whom walking is difficult or impossible due to some illness, injury or disability. There are different types of wheelchairs. Manual wheelchairs are pushed using their handles. Motorised wheelchairs, are driven by joystick. Voice-controlled wheelchairs...