This hFE or transistor forward gain tester is intriguing due to its ease-of-use and because it allows the use of both PNP and NPN transistors to be assessed. Additionally more […]
Simple Microphone (MIC) Amplifier Circuits
The first one is a single transistor simple microphone circuit, very simple to hook up using an electret microphone or MIC and an audio amplifier. Typically the 10K resistor within […]
Simple 220V Ding Dong Bell Circuit
The post explains how to make a simple 220V mains operated ding dong bell circuit which will generate a powerful ding dong sound each time someone presses the bell push […]
220V Light Dimmer Circuit using Push Button Control
The following circuit can be effortlessly used for dimming a 220V or 120V mains operated lamp or fan using a single push button operation. Referring to the given figure, the […]
Cellphone Power Bank Circuit you can Make at Home
This simple cellphone power bank circuit charger can be built at home and used for emergency charging your cell phone anytime anyplace regardless of an AC mains outlet or input […]
How to Calculate Capacitor Series Parallel Connections
In this article we will learn the formulas for calculating capacitors connected in series and parallel, and also understand regarding the various parameters associated with capacitors in electrical circuits, in […]