In this article I have explained how to build a very simple, low cost LED lamp with charger. This unit can be used by any street seller, vendor, hawker, to illuminate his shop during night. Thus, the light will ensure that the seller can continue to do business even after dusk to enhance his profits. […]
New Circuit Projects
Semiconductor Tester Circuit [LED, Transistor, SCR Tester]
The semiconductor tester circuit I have explained below performs continuity tests on SCRs, bipolar transistors, and diodes. How the Circuit Works A squarewave oscillator with a frequency of about 350 Hz is produced by a couple of IC 4049 gates, U1a along with U1b, R1, R2, and C1. The complementary outputs required for testing both NPN and […]
Freezerless Refrigerator Circuit Diagram Explained
Existing frost free double door refrigerators function with the help of defrost timer and defrost heater for automatic defrosting. The objective of my circuit is to convert the existing refrigerator to one, without freezer (freezerless) Written and Submitted By: Subramanian. C.N. My circuit modifies the existing circuit of my refrigerator, by replacing the existing defrost […]
Guitar Jammer Circuit (Mix an External Audio with your Guitar)
This Guitar Jammer circuit I have explained below enables you to jam out to your favorite songs from your cellphone or computer. You can mix an external audio track with your guitar sound, then use headphones to listen to the blended result. Imagine playing note-for-note copies of legendary guitarist’s riffs and exchanging scorching pentatonics, “hammer-ons,” […]
Neon Tube Driver Circuit
The high-voltage neon tube driver circuit discussed in this article generates 500 volts of high-frequency AC (15 kHz). This circuit may be used to brightly illuminate all types of neon tubes. Neon ranks among the best when it comes to striking, eye-catching lighting displays. Virtually every industry, from pizza restaurants to clothes boutiques, uses neon […]
Crystal Radio Sets with Amplifier Circuit
A crystal radio receiver, often known as a crystal set, is a simplest form of radio receiver that was widely used in the initial periods of radio. A crystal radio set does not require any external power supply to operate. Instead, it simply makes sound using the energy of the radio signals that is received. […]
